diff --git a/mag/1T1R.mag b/mag/1T1R.mag
index 1db5dde..e35a953 100644
--- a/mag/1T1R.mag
+++ b/mag/1T1R.mag
@@ -1,7 +1,7 @@
 magic
 tech sky130B
 magscale 1 2
-timestamp 1645671787
+timestamp 1646863508
 << pwell >>
 rect -260 -162 172 238
 << nnmos >>
@@ -78,4 +78,13 @@
 timestamp 1644250323
 transform 1 0 -12 0 1 44
 box -32 -32 32 32
+<< labels >>
+rlabel metal2 -24 -158 -4 -140 1 sl
+port 4 n
+rlabel metal2 -162 -158 -142 -140 1 VGND
+port 3 n ground default
+rlabel metal1 -240 200 -220 218 1 bl
+port 1 n
+rlabel metal1 -236 -116 -216 -98 1 wl
+port 2 n
 << end >>
diff --git a/mag/sky130_sc_ams__comparator_1.mag b/mag/sky130_sc_ams__comparator_1.mag
new file mode 100644
index 0000000..2f368e5
--- /dev/null
+++ b/mag/sky130_sc_ams__comparator_1.mag
@@ -0,0 +1,1542 @@
+magic
+tech sky130B
+magscale 1 2
+timestamp 1647467084
+<< nwell >>
+rect -38 414 4914 582
+rect -38 261 130 414
+rect 2171 261 3282 414
+rect 2171 157 2465 261
+rect 3980 264 4914 414
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+rect 0 48 2139 222
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+rect 0 -48 4873 48
+<< nmos >>
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+<< pdiffc >>
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+<< labels >>
+flabel metal1 29 527 63 561 0 FreeSans 192 0 0 0 VPWR
+port 7 nsew
+flabel nwell 87 527 121 561 0 FreeSans 192 0 0 0 VPB
+port 6 nsew
+flabel metal1 29 -17 63 17 0 FreeSans 192 0 0 0 VGND
+port 4 nsew
+flabel pwell 100 -17 134 17 0 FreeSans 192 0 0 0 VNB
+port 5 nsew
+flabel viali 652 161 686 195 0 FreeSans 192 0 0 0 VIN2
+port 3 nsew
+flabel viali 128 358 162 392 0 FreeSans 192 0 0 0 CLK
+port 1 nsew
+flabel locali 4798 323 4832 357 0 FreeSans 192 0 0 0 X
+port 8 nsew
+flabel locali 4798 255 4832 289 0 FreeSans 192 0 0 0 X
+port 8 nsew
+flabel locali 4798 187 4832 221 0 FreeSans 192 0 0 0 X
+port 8 nsew
+flabel locali 4798 391 4832 425 0 FreeSans 192 0 0 0 X
+port 8 nsew
+flabel locali 4798 119 4832 153 0 FreeSans 192 0 0 0 X
+port 8 nsew
+flabel viali 652 297 686 331 0 FreeSans 192 0 0 0 VIN1
+port 2 nsew
+<< end >>
diff --git a/mag/sky130_sc_ams__ota_1.mag b/mag/sky130_sc_ams__ota_1.mag
new file mode 100644
index 0000000..f8c8f2e
--- /dev/null
+++ b/mag/sky130_sc_ams__ota_1.mag
@@ -0,0 +1,2447 @@
+magic
+tech sky130B
+magscale 1 2
+timestamp 1647467249
+<< nwell >>
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+<< metal1 >>
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+rect 6411 -17 6469 17
+rect 6503 -17 6561 17
+rect 6595 -17 6653 17
+rect 6687 -17 6716 17
+rect 0 -48 6716 -17
+<< via1 >>
+rect 6656 96 6716 450
+<< metal2 >>
+rect 6656 450 6716 460
+rect 6656 86 6716 96
+<< labels >>
+flabel metal1 29 527 63 561 0 FreeSans 192 0 0 0 VPWR
+port 8 nsew
+flabel nwell 87 527 121 561 0 FreeSans 192 0 0 0 VPB
+port 7 nsew
+flabel metal1 29 -17 63 17 0 FreeSans 192 0 0 0 VGND
+port 5 nsew
+flabel pwell 100 -17 134 17 0 FreeSans 192 0 0 0 VNB
+port 6 nsew
+flabel viali 6657 366 6691 400 0 FreeSans 192 0 0 0 Iout
+port 4 nsew
+flabel viali 6657 298 6691 332 0 FreeSans 192 0 0 0 Iout
+port 4 nsew
+flabel viali 6657 230 6691 264 0 FreeSans 192 0 0 0 Iout
+port 4 nsew
+flabel viali 6657 162 6691 196 0 FreeSans 192 0 0 0 Iout
+port 4 nsew
+flabel locali 4815 55 4849 89 0 FreeSans 192 0 0 0 Vin2
+port 2 nsew
+flabel locali 4815 437 4849 471 0 FreeSans 192 0 0 0 Vin1
+port 1 nsew
+<< end >>
diff --git a/mag/user_analog_project_wrapper.mag b/mag/user_analog_project_wrapper.mag
index 96f8caa..920ba4a 100644
--- a/mag/user_analog_project_wrapper.mag
+++ b/mag/user_analog_project_wrapper.mag
@@ -1,11 +1,20 @@
 magic
 tech sky130B
 magscale 1 2
-timestamp 1646596575
+timestamp 1647480005
 << dnwell >>
 rect 561940 685328 563006 686342
 << pwell >>
 rect 562058 685450 562858 686250
+<< poly >>
+rect 213898 659600 213984 659910
+rect 213882 658944 213998 659266
+<< locali >>
+rect 215760 659268 215804 659620
+rect 217226 659318 217280 659384
+<< viali >>
+rect 213906 659826 213974 659878
+rect 213902 658982 213982 659056
 << metal1 >>
 rect 561180 686400 561428 686442
 rect 561180 686254 561216 686400
@@ -36,18 +45,58 @@
 rect 225178 683618 560962 683790
 rect 224866 683613 560962 683618
 rect 224866 683612 226828 683613
+rect 216120 682286 216308 682294
+rect 216120 681540 216126 682286
+rect 216304 681540 216308 682286
+rect 216120 680764 216308 681540
+rect 216120 680580 216310 680764
+rect 216126 666238 216310 680580
+rect 216126 665216 216312 666238
+rect 216128 662754 216312 665216
+rect 216128 662068 216314 662754
+rect 213894 659878 213986 659884
+rect 213894 659826 213906 659878
+rect 213974 659826 213986 659878
+rect 213894 659820 213986 659826
+rect 216128 659764 216312 662068
+rect 215822 659762 216662 659764
+rect 215798 659668 216662 659762
+rect 215754 659264 215806 659622
+rect 215808 659124 216648 659220
+rect 213890 659056 213994 659062
+rect 213890 658982 213902 659056
+rect 213982 658982 213994 659056
+rect 213890 658976 213994 658982
+rect 216120 642588 216298 659124
+rect 216120 641864 216126 642588
+rect 216292 641864 216298 642588
+rect 216120 641856 216298 641864
 << via1 >>
 rect 561216 686254 561378 686400
 rect 561216 685764 561378 685910
 rect 326572 684652 326878 684824
 rect 224872 683618 225178 683790
+rect 216126 681540 216304 682286
+rect 213902 658982 213982 659056
+rect 216126 641864 216292 642588
 << metal2 >>
+rect 512622 703358 513362 703376
+rect 122320 703284 123060 703286
+rect 122318 703270 123060 703284
+rect 122318 702570 122338 703270
+rect 123038 702570 123060 703270
 rect 415430 703206 416162 703216
 rect 415430 702616 415440 703206
 rect 416152 702616 416162 703206
 rect 415430 702606 416162 702616
 rect 467610 703066 468342 703076
+rect 122318 702546 123060 702570
 rect -193 -193 193 700125
+rect 122318 680994 123058 702546
+rect 172762 699814 173502 699834
+rect 172762 699114 172784 699814
+rect 173484 699114 173502 699814
+rect 172762 681240 173502 699114
 rect 224634 698474 225366 698484
 rect 224634 697884 224644 698474
 rect 225356 697884 225366 698474
@@ -66,11 +115,14 @@
 rect 467610 702476 467620 703066
 rect 468332 702476 468342 703066
 rect 467610 702466 468342 702476
+rect 512622 702658 512642 703358
+rect 513342 702658 513362 703358
+rect 467832 686486 468157 702466
+rect 512622 687290 513362 702658
 rect 522684 702928 523010 702938
 rect 522684 702578 522694 702928
 rect 523000 702578 523010 702928
 rect 568938 702909 569264 702910
-rect 467832 686486 468157 702466
 rect 522684 702447 523010 702578
 rect 568933 702900 569264 702909
 rect 568933 702550 568942 702900
@@ -79,9 +131,14 @@
 rect 568933 700536 569264 702550
 rect 522681 700196 562334 700528
 rect 564007 700208 569264 700536
+rect 512622 687270 513364 687290
+rect 512622 686570 512642 687270
+rect 513342 686570 513364 687270
 rect 562009 686923 562327 700196
 rect 564010 687532 564332 700208
 rect 568933 700207 569264 700208
+rect 512622 686558 513364 686570
+rect 512624 686550 513364 686558
 rect 467832 686484 560486 686486
 rect 467832 686400 561462 686484
 rect 467832 686254 561216 686400
@@ -102,20 +159,80 @@
 rect 415661 685764 561216 685910
 rect 561378 685764 561462 685910
 rect 415661 685672 561462 685764
-rect 562270 685199 562343 685519
 rect 326562 684652 326572 684824
 rect 326878 684652 326889 684824
 rect 326562 684641 326889 684652
+rect 512610 685570 513366 685590
+rect 512610 684870 512642 685570
+rect 513342 684870 513366 685570
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 rect 224862 683618 224872 683790
 rect 225178 683618 225189 683790
 rect 224862 683607 225189 683618
+rect 512610 682292 513366 684870
+rect 216120 682286 513366 682292
+rect 216120 681540 216126 682286
+rect 216304 681546 513366 682286
+rect 216304 681540 513364 681546
+rect 216120 681536 513364 681540
 rect 562127 681532 562489 685199
 rect 582202 681532 583046 681536
 rect 562127 681526 583046 681532
+rect 172762 681190 217496 681240
+rect 122318 680910 217316 680994
+rect 122318 680908 123058 680910
+rect 213548 659820 213986 659884
+rect 4346 511652 4478 511670
+rect 213548 511652 213616 659820
+rect 340 511642 213616 511652
+rect 480 511530 213616 511642
+rect 340 511508 213616 511530
+rect 213902 659056 213982 659070
+rect 213902 468414 213982 658982
+rect 215750 657922 215838 659630
+rect 215438 657832 215838 657922
+rect 215438 583670 215526 657832
+rect 216680 657578 216768 659598
+rect 217190 659438 217316 680910
+rect 217412 659394 217496 681190
 rect 562127 681176 582730 681526
 rect 583036 681176 583046 681526
 rect 562127 681170 583046 681176
 rect 582202 681166 583046 681170
+rect 217202 659306 217496 659394
+rect 221370 659503 221468 659648
+rect 221370 659423 223646 659503
+rect 221370 659248 221468 659423
+rect 215768 657496 216768 657578
+rect 215770 587230 215846 657496
+rect 223537 646394 223646 659423
+rect 223537 646283 223646 646293
+rect 216120 642588 583256 642596
+rect 216120 641864 216126 642588
+rect 216292 642580 583256 642588
+rect 216292 641880 582542 642580
+rect 583242 641880 583256 642580
+rect 216292 641864 583256 641880
+rect 216120 641856 583256 641864
+rect 223536 638408 223645 638412
+rect 223530 638402 223650 638408
+rect 223530 638301 223536 638402
+rect 223645 638301 223650 638402
+rect 223530 588406 223650 638301
+rect 223530 588392 583640 588406
+rect 223530 588300 583530 588392
+rect 583634 588300 583640 588392
+rect 223530 588292 583640 588300
+rect 583530 588290 583640 588292
+rect 215768 587220 583732 587230
+rect 215768 587108 583520 587220
+rect 215768 587098 583732 587108
+rect 215438 583660 583636 583670
+rect 215438 583576 583534 583660
+rect 215438 583566 583636 583576
+rect 360 468404 213982 468414
+rect 462 468320 213982 468404
+rect 360 468310 213982 468320
 rect 524 -800 636 480
 rect 1706 -800 1818 480
 rect 2888 -800 3000 480
@@ -611,17 +728,35 @@
 rect 582068 -800 582180 480
 rect 583250 -800 583362 480
 << via2 >>
+rect 122338 702570 123038 703270
 rect 415440 702616 416152 703206
+rect 172784 699114 173484 699814
 rect 224644 697884 225356 698474
 rect 326344 697884 327056 698474
 rect 467620 702476 468332 703066
+rect 512642 702658 513342 703358
 rect 522694 702578 523000 702928
 rect 568942 702550 569254 702900
+rect 512642 686570 513342 687270
+rect 512642 684870 513342 685570
+rect 340 511530 480 511642
 rect 582730 681176 583036 681526
+rect 223537 646293 223646 646394
+rect 582542 641880 583242 642580
+rect 223536 638301 223645 638402
+rect 583530 588300 583634 588392
+rect 583520 587108 583732 587220
+rect 583534 583576 583636 583660
+rect 360 468320 462 468404
 << metal3 >>
+rect 165596 704800 170590 704804
+rect 175896 704800 180890 704804
 rect 16194 702300 21194 704800
 rect 68194 702300 73194 704800
-rect 120194 702300 125194 704800
+rect 120194 703270 125194 704800
+rect 120194 702570 122338 703270
+rect 123038 702570 125194 703270
+rect 120194 702300 125194 702570
 rect 165594 702300 170594 704800
 rect 170894 702300 173094 704800
 rect 173394 702300 175594 704800
@@ -642,7 +777,10 @@
 rect 465394 702476 467620 703066
 rect 468332 702476 470394 703066
 rect 465394 702300 470394 702476
-rect 510594 702340 515394 704800
+rect 510594 703358 515394 704800
+rect 510594 702658 512642 703358
+rect 513342 702658 515394 703358
+rect 510594 702340 515394 702658
 rect 520594 702928 525394 704800
 rect 520594 702578 522694 702928
 rect 523000 702578 525394 702928
@@ -651,9 +789,16 @@
 rect 566594 702550 568942 702900
 rect 569254 702550 571594 702900
 rect 566594 702300 571594 702550
+rect 165596 701002 170590 702300
+rect 175896 701002 180890 702300
+rect 165556 699814 180890 701002
+rect 165556 699114 172784 699814
+rect 173484 699114 180890 699814
+rect 165556 698298 180890 699114
 rect 217296 699170 222286 702300
 rect 227598 699170 232588 702300
 rect 217296 698474 232588 699170
+rect 165556 698198 180868 698298
 rect 217296 697884 224644 698474
 rect 225356 697884 232588 698474
 rect 217296 697340 232588 697884
@@ -663,26 +808,57 @@
 rect 318994 697884 326344 698474
 rect 327056 697884 334288 698474
 rect 318994 697340 334288 697884
+rect 512620 687270 513364 687278
+rect 512620 686570 512642 687270
+rect 513342 686570 513364 687270
+rect 512620 685570 513364 686570
 rect -800 680242 1700 685242
+rect 512620 684870 512642 685570
+rect 513342 684870 513364 685570
+rect 512620 684846 513364 684870
 rect 582300 681526 584802 682984
 rect 582300 681176 582730 681526
 rect 583036 681176 584802 681526
 rect 582300 677984 584802 681176
 rect -800 643842 1660 648642
-rect 582340 639784 584800 644584
+rect 223525 646394 223657 646406
+rect 223525 646293 223537 646394
+rect 223646 646293 223657 646394
 rect -800 633842 1660 638642
-rect 582340 629784 584800 634584
+rect 223525 638402 223657 646293
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+rect 582332 641880 582542 642580
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+rect 223525 638301 223536 638402
+rect 223645 638301 223657 638402
+rect 223525 638296 223657 638301
+rect 582342 629782 584802 634588
 rect 583520 589472 584800 589584
-rect 583520 588290 584800 588402
-rect 583520 587108 584800 587220
+rect 583520 588392 584800 588402
+rect 583520 588300 583530 588392
+rect 583634 588300 584800 588392
+rect 583520 588290 584800 588300
+rect 583510 587220 583742 587225
+rect 583510 587108 583520 587220
+rect 583732 587108 584800 587220
+rect 583510 587103 583742 587108
 rect 583520 585926 584800 586038
 rect 583520 584744 584800 584856
-rect 583520 583562 584800 583674
+rect 583520 583660 584800 583674
+rect 583520 583576 583534 583660
+rect 583636 583576 584800 583660
+rect 583520 583562 584800 583576
 rect -800 559442 1660 564242
 rect -800 549442 1660 554242
 rect 582340 550562 584800 555362
 rect 582340 540562 584800 545362
-rect -800 511530 480 511642
+rect 330 511642 490 511647
+rect -800 511530 340 511642
+rect 480 511530 490 511642
+rect 330 511525 490 511530
 rect -800 510348 480 510460
 rect -800 509166 480 509278
 rect -800 507984 480 508096
@@ -694,7 +870,10 @@
 rect 583520 496504 584800 496616
 rect 583520 495322 584800 495434
 rect 583520 494140 584800 494252
-rect -800 468308 480 468420
+rect -800 468404 480 468420
+rect -800 468320 360 468404
+rect 462 468320 480 468404
+rect -800 468308 480 468320
 rect -800 467126 480 467238
 rect -800 465944 480 466056
 rect -800 464762 480 464874
@@ -857,6 +1036,14 @@
 timestamp 1645671873
 transform 1 0 562058 0 1 685450
 box 0 0 864 800
+use sky130_sc_ams__comparator_1  sky130_sc_ams__comparator_1_1
+timestamp 1647467084
+transform 1 0 216584 0 1 659172
+box -38 -48 4914 592
+use sky130_sc_ams__ota_1  sky130_sc_ams__ota_1_1
+timestamp 1647467249
+transform 1 0 209108 0 1 659172
+box -38 -48 6754 592
 << labels >>
 flabel metal3 s 583520 269230 584800 269342 0 FreeSans 1120 0 0 0 gpio_analog[0]
 port 0 nsew signal bidirectional
@@ -2008,8 +2195,6 @@
 port 561 nsew signal bidirectional
 flabel metal3 s 520594 702340 525394 704800 0 FreeSans 1920 180 0 0 vssa1
 port 562 nsew signal bidirectional
-flabel metal3 s 510594 702340 515394 704800 0 FreeSans 1920 180 0 0 vssa1
-port 563 nsew signal bidirectional
 flabel metal3 s 582340 146830 584800 151630 0 FreeSans 1120 0 0 0 vssa1
 port 564 nsew signal bidirectional
 flabel metal3 s 582340 136830 584800 141630 0 FreeSans 1120 0 0 0 vssa1
@@ -2238,6 +2423,8 @@
 port 676 nsew signal input
 flabel metal2 s 6434 -800 6546 480 0 FreeSans 1120 90 0 0 wbs_we_i
 port 677 nsew signal input
+flabel metal3 s 510594 702340 515394 704800 0 FreeSans 1920 180 0 0 vssa1
+port 563 nsew signal bidirectional
 << properties >>
 string FIXED_BBOX 0 0 584000 704000
 << end >>
diff --git a/xschem/sky130_sc_ams__comparator_1.sch b/xschem/sky130_sc_ams__comparator_1.sch
new file mode 100644
index 0000000..8f65613
--- /dev/null
+++ b/xschem/sky130_sc_ams__comparator_1.sch
@@ -0,0 +1,442 @@
+v {xschem version=2.9.9 file_version=1.2 }
+G {}
+K {}
+V {}
+S {}
+E {}
+N 0 170 0 230 { lab=#net1}
+N -110 170 110 170 { lab=#net1}
+N 110 30 110 110 { lab=#net2}
+N -110 30 -110 110 { lab=#net3}
+N -420 -230 420 -230 { lab=VPWR}
+N -110 -170 -110 -30 { lab=#net4}
+N 110 -170 110 -30 { lab=#net5}
+N -420 -170 -420 80 { lab=#net3}
+N -420 80 -110 80 { lab=#net3}
+N 420 -170 420 80 { lab=#net2}
+N 110 80 420 80 { lab=#net2}
+N -290 -170 -290 -140 { lab=#net4}
+N -290 -140 -110 -140 { lab=#net4}
+N 290 -170 290 -140 { lab=#net5}
+N 110 -140 290 -140 { lab=#net5}
+N -330 -200 -330 -140 { lab=CLK}
+N -460 -140 -330 -140 { lab=CLK}
+N -460 -200 -460 -140 { lab=CLK}
+N 330 -200 330 -140 { lab=CLK}
+N 330 -140 460 -140 { lab=CLK}
+N 460 -200 460 -140 { lab=CLK}
+N -70 -200 70 -140 { lab=#net5}
+N 70 -140 110 -140 { lab=#net5}
+N -70 0 70 -60 { lab=#net5}
+N 70 -60 110 -60 { lab=#net5}
+N -70 -60 70 0 { lab=#net4}
+N -110 -60 -70 -60 { lab=#net4}
+N -70 -140 70 -200 { lab=#net4}
+N -110 -140 -70 -140 { lab=#net4}
+N 620 130 620 170 { lab=#net6}
+N 620 -170 620 -130 { lab=#net7}
+N 580 -200 580 -100 { lab=#net5}
+N 580 100 580 200 { lab=#net4}
+N 110 -120 580 -120 { lab=#net5}
+N -110 -80 500 -80 { lab=#net4}
+N 500 -80 500 140 { lab=#net4}
+N 500 140 580 140 { lab=#net4}
+N 620 -150 760 -150 { lab=#net7}
+N 760 -150 760 -100 { lab=#net7}
+N 760 -100 800 -100 { lab=#net7}
+N 620 150 1120 150 { lab=#net6}
+N 1120 -100 1120 150 { lab=#net6}
+N 1080 -100 1120 -100 { lab=#net6}
+N 840 -200 840 -130 { lab=X}
+N 1040 -200 1040 -130 { lab=#net8}
+N 880 -230 1000 -180 { lab=#net8}
+N 1000 -180 1040 -180 { lab=#net8}
+N 880 -180 1000 -230 { lab=X}
+N 840 -180 880 -180 { lab=X}
+N 840 -260 1040 -260 { lab=VPWR}
+N -420 120 -420 200 { lab=VGND}
+N -420 200 -360 200 { lab=VGND}
+N -360 120 -360 200 { lab=VGND}
+N 360 120 360 200 { lab=VGND}
+N 360 200 420 200 { lab=VGND}
+N 420 120 420 200 { lab=VGND}
+N -320 -100 -320 -20 { lab=VGND}
+N -320 -20 -260 -20 { lab=VGND}
+N -260 -100 -260 -20 { lab=VGND}
+N 260 -100 260 -20 { lab=VGND}
+N 260 -20 320 -20 { lab=VGND}
+N 320 -100 320 -20 { lab=VGND}
+C {devices/ipin.sym} 0 -450 0 0 {name=p4 lab=CLK}
+C {devices/ipin.sym} -150 140 0 0 {name=p1 lab=VIN1}
+C {devices/ipin.sym} 150 140 0 1 {name=p3 lab=VIN2}
+C {devices/ipin.sym} 0 -420 0 0 {name=p5 lab=VGND}
+C {devices/ipin.sym} 0 -390 0 0 {name=p6 lab=VNB}
+C {devices/ipin.sym} 0 -360 0 0 {name=p7 lab=VPB}
+C {devices/ipin.sym} 0 -330 0 0 {name=p8 lab=VPWR}
+C {devices/opin.sym} 840 -150 0 1 {name=p2 lab=X}
+C {sky130_fd_pr/nfet_01v8.sym} -20 260 0 0 {name=M1
+L=0.15
+W=1.49
+nf=1 
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} -440 -200 0 0 {name=M2
+L=0.15
+W=0.45
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 0 -450 0 1 {name=l1 sig_type=std_logic lab=CLK}
+C {devices/lab_pin.sym} 0 -420 0 1 {name=l2 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} 0 -390 0 1 {name=l3 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 0 -360 0 1 {name=l4 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 0 -330 0 1 {name=l5 sig_type=std_logic lab=VPWR}
+C {devices/lab_pin.sym} -40 260 0 0 {name=l6 sig_type=std_logic lab=CLK}
+C {devices/lab_pin.sym} 0 290 1 1 {name=l7 sig_type=std_logic lab=VGND}
+C {sky130_fd_pr/nfet_01v8.sym} -130 140 0 0 {name=M3
+L=0.15
+W=1
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} 130 140 0 1 {name=M4
+L=0.15
+W=1
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} 90 0 0 0 {name=M5
+L=0.15
+W=0.7
+nf=1 
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -90 0 0 1 {name=M6
+L=0.15
+W=0.7
+nf=1 
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} -310 -200 0 0 {name=M7
+L=0.15
+W=0.45
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} -90 -200 0 1 {name=M8
+L=0.15
+W=0.63
+nf=1
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 90 -200 0 0 {name=M9
+L=0.15
+W=0.63
+nf=1
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 310 -200 0 1 {name=M10
+L=0.15
+W=0.45
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 440 -200 0 1 {name=M11
+L=0.15
+W=0.45
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 0 -230 3 1 {name=l8 sig_type=std_logic lab=VPWR}
+C {devices/lab_pin.sym} 460 -200 0 1 {name=l9 sig_type=std_logic lab=CLK}
+C {devices/lab_pin.sym} -460 -200 0 0 {name=l10 sig_type=std_logic lab=CLK}
+C {devices/lab_pin.sym} -420 -200 0 1 {name=l11 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} -290 -200 0 1 {name=l12 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 110 -200 0 1 {name=l13 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} -110 -200 0 0 {name=l14 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 290 -200 0 0 {name=l15 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 420 -200 0 0 {name=l16 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 110 0 0 1 {name=l17 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -110 140 0 1 {name=l18 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 0 260 0 1 {name=l19 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -110 0 0 0 {name=l20 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 110 140 0 0 {name=l21 sig_type=std_logic lab=VNB}
+C {sky130_fd_pr/nfet_01v8.sym} 600 -100 0 0 {name=M12
+L=0.15
+W=0.65
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 600 -200 0 0 {name=M13
+L=0.15
+W=1
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} 600 200 0 0 {name=M14
+L=0.15
+W=0.65
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 600 100 0 0 {name=M15
+L=0.15
+W=1
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} 820 -100 0 0 {name=M16
+L=0.15
+W=0.645
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} 1060 -100 0 1 {name=M17
+L=0.15
+W=0.645
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 620 230 1 1 {name=l22 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} 620 -70 1 1 {name=l23 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} 840 -70 1 1 {name=l24 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} 1040 -70 1 1 {name=l25 sig_type=std_logic lab=VGND}
+C {sky130_fd_pr/pfet_01v8.sym} 860 -230 0 1 {name=M18
+L=0.15
+W=0.7
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 1020 -230 0 0 {name=M19
+L=0.15
+W=0.7
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 940 -260 3 1 {name=l26 sig_type=std_logic lab=VPWR}
+C {devices/lab_pin.sym} 620 -230 3 1 {name=l27 sig_type=std_logic lab=VPWR}
+C {devices/lab_pin.sym} 620 70 3 1 {name=l28 sig_type=std_logic lab=VPWR}
+C {devices/lab_pin.sym} 840 -230 0 0 {name=l29 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 620 -200 0 1 {name=l30 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 620 100 0 1 {name=l31 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 1040 -230 0 1 {name=l32 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 1040 -100 0 0 {name=l33 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 840 -100 0 1 {name=l34 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 620 -100 0 1 {name=l35 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 620 200 0 1 {name=l36 sig_type=std_logic lab=VNB}
+C {sky130_fd_pr/nfet_01v8.sym} -390 100 1 0 {name=M20
+L=1
+W=1.49
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} -390 120 1 1 {name=l37 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -390 200 1 1 {name=l38 sig_type=std_logic lab=VGND}
+C {sky130_fd_pr/nfet_01v8.sym} 390 100 1 0 {name=M21
+L=1
+W=1.49
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 390 120 1 1 {name=l39 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 390 200 1 1 {name=l40 sig_type=std_logic lab=VGND}
+C {sky130_fd_pr/nfet_01v8.sym} -290 -120 1 0 {name=M22
+L=1
+W=1.49
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} -290 -100 1 1 {name=l41 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -290 -20 1 1 {name=l42 sig_type=std_logic lab=VGND}
+C {sky130_fd_pr/nfet_01v8.sym} 290 -120 1 0 {name=M23
+L=1
+W=1.49
+nf=1 
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 290 -100 1 1 {name=l43 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 290 -20 1 1 {name=l44 sig_type=std_logic lab=VGND}
diff --git a/xschem/sky130_sc_ams__comparator_1.sym b/xschem/sky130_sc_ams__comparator_1.sym
new file mode 100644
index 0000000..0b15c22
--- /dev/null
+++ b/xschem/sky130_sc_ams__comparator_1.sym
@@ -0,0 +1,38 @@
+v {xschem version=2.9.9 file_version=1.2 }
+G {}
+K {type=subcircuit
+format="@name @pinlist @symname"
+template="name=x1"
+}
+V {}
+S {}
+E {}
+L 4 -70 0 -50 0 {}
+L 4 70 0 90 0 {}
+L 4 -70 30 -50 30 {}
+L 4 -70 -30 -50 -30 {}
+L 4 -50 -60 -50 60 {}
+L 4 -50 60 70 0 {}
+L 4 -50 -60 70 0 {}
+L 4 10 -60 10 -30 {}
+L 4 -10 -60 -10 -40 {}
+L 4 10 30 10 60 {}
+L 4 -10 40 -10 60 {}
+B 5 -72.5 -2.5 -67.5 2.5 {name=CLK dir=in }
+B 5 -72.5 -32.5 -67.5 -27.5 {name=VIN1 dir=in }
+B 5 -72.5 27.5 -67.5 32.5 {name=VIN2 dir=in }
+B 5 7.5 57.5 12.5 62.5 {name=VGND dir=in }
+B 5 -12.5 57.5 -7.5 62.5 {name=VNB dir=in }
+B 5 -12.5 -62.5 -7.5 -57.5 {name=VPB dir=in }
+B 5 7.5 -62.5 12.5 -57.5 {name=VPWR dir=in }
+B 5 87.5 -2.5 92.5 2.5 {name=X dir=out }
+T {@symname} 20.5 -46 0 0 0.3 0.3 {}
+T {@name} -55 -92 0 0 0.2 0.2 {}
+T {CLK} -45 -4 0 0 0.2 0.2 {}
+T {VIN1} -45 -34 0 0 0.2 0.2 {}
+T {VIN2} -45 26 0 0 0.2 0.2 {}
+T {VGND} 15 51 0 0 0.2 0.2 {}
+T {VNB} -35 51 0 0 0.2 0.2 {}
+T {VPB} -35 -64 0 0 0.2 0.2 {}
+T {VPWR} 15 -64 0 0 0.2 0.2 {}
+T {X} 85 -14 0 1 0.2 0.2 {}
diff --git a/xschem/sky130_sc_ams__ota_1.sch b/xschem/sky130_sc_ams__ota_1.sch
new file mode 100644
index 0000000..6e377c5
--- /dev/null
+++ b/xschem/sky130_sc_ams__ota_1.sch
@@ -0,0 +1,449 @@
+v {xschem version=2.9.9 file_version=1.2 }
+G {}
+K {}
+V {}
+S {}
+E {}
+N -250 -180 -250 -120 { lab=#net1}
+N -350 -210 -290 -210 { lab=#net1}
+N -290 -160 -250 -160 { lab=#net1}
+N 270 -180 270 -120 { lab=#net2}
+N 310 -210 370 -210 { lab=#net2}
+N -310 -160 -290 -160 { lab=#net1}
+N -310 -210 -310 -160 { lab=#net1}
+N 270 -160 330 -160 { lab=#net2}
+N 330 -210 330 -160 { lab=#net2}
+N -380 -240 300 -240 { lab=VPWR}
+N -560 90 -560 120 { lab=#net3}
+N -1060 0 -1020 0 { lab=#net4}
+N -1020 0 -1020 30 { lab=#net4}
+N -1140 60 -1060 60 { lab=VGND}
+N -0 -60 0 -0 { lab=#net5}
+N -560 -180 -560 90 { lab=#net3}
+N -1020 30 -960 30 { lab=#net4}
+N -1020 -210 -960 -210 { lab=#net6}
+N -960 -160 -920 -160 { lab=#net6}
+N -980 -160 -960 -160 { lab=#net6}
+N -980 -210 -980 -160 { lab=#net6}
+N -420 30 -40 30 { lab=#net4}
+N -1060 -180 -1060 0 { lab=#net4}
+N -920 -180 -920 0 { lab=#net6}
+N -1220 -100 -1220 -40 { lab=#net4}
+N -1220 -40 -1060 -40 { lab=#net4}
+N -1220 -160 -980 -160 { lab=#net6}
+N -1360 -240 -1060 -240 { lab=VPWR}
+N -1360 -180 -1360 -130 { lab=#net7}
+N -1360 -130 -1260 -130 { lab=#net7}
+N -1360 -180 -1320 -180 { lab=#net7}
+N -1320 -210 -1320 -180 { lab=#net7}
+N -1360 -130 -1360 0 { lab=#net7}
+N -1360 60 -1140 60 { lab=VGND}
+N -1320 0 -1320 30 { lab=#net4}
+N -1320 0 -1060 0 { lab=#net4}
+N -1060 -240 -1000 -240 { lab=VPWR}
+N -720 120 -560 120 { lab=#net3}
+N -680 150 -680 180 { lab=VGND}
+N -720 180 -680 180 { lab=VGND}
+N -490 -60 -450 -60 { lab=VGND}
+N 170 -240 170 -210 { lab=VPWR}
+N 130 -180 130 -160 { lab=#net2}
+N 410 -180 410 120 { lab=Iout}
+N 130 -160 270 -160 { lab=#net2}
+N -150 -240 -150 -210 { lab=VPWR}
+N -110 -180 -110 -160 { lab=#net1}
+N -250 -160 -110 -160 { lab=#net1}
+N 300 -240 410 -240 { lab=VPWR}
+N -490 -90 -490 -60 { lab=VGND}
+N -450 -120 -250 -120 { lab=#net1}
+N -250 -60 270 -60 { lab=#net5}
+N -520 150 370 150 { lab=#net3}
+N -560 100 -500 100 { lab=#net3}
+N -500 100 -500 150 { lab=#net3}
+N -640 -240 -380 -240 { lab=VPWR}
+N -520 -210 -350 -210 { lab=#net1}
+N -1170 30 -1170 60 { lab=VGND}
+N -1060 -40 -770 -40 { lab=#net4}
+N -1000 -240 -940 -240 { lab=VPWR}
+N -830 -240 -830 -210 { lab=VPWR}
+N -790 -180 -790 -160 { lab=#net6}
+N -920 -160 -790 -160 { lab=#net6}
+N -920 0 -780 0 { lab=#net6}
+N -820 30 -820 60 { lab=VGND}
+N -820 60 -780 60 { lab=VGND}
+N -780 60 -780 120 { lab=VGND}
+N -940 -240 -640 -240 { lab=VPWR}
+N -770 -40 -660 -40 { lab=#net4}
+N -660 -40 -660 30 { lab=#net4}
+N -660 30 -420 30 { lab=#net4}
+N -920 120 -780 120 { lab=VGND}
+C {devices/ipin.sym} 310 -90 0 1 {name=Vin1 lab=Vin1}
+C {devices/ipin.sym} -290 -90 0 0 {name=Vin2 lab=Vin2}
+C {devices/ipin.sym} 0 -320 0 0 {name=p3 lab=VGND}
+C {devices/ipin.sym} 0 -350 0 0 {name=p2 lab=VNB}
+C {devices/ipin.sym} 0 -380 0 0 {name=p1 lab=VPB}
+C {devices/ipin.sym} 0 -410 0 0 {name=p4 lab=VPWR}
+C {devices/opin.sym} 410 -70 0 0 {name=Iout lab=Iout}
+C {sky130_fd_pr/pfet_01v8.sym} 390 -210 0 0 {name=M7
+L=0.30
+W=0.61
+nf=1
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} -540 -210 0 1 {name=M8
+L=0.15
+W=0.61
+nf=1
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 290 -210 0 1 {name=M9
+L=0.15
+W=0.61
+nf=1
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -20 30 0 0 {name=M1
+L=0.15
+W=0.70
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -1040 30 0 1 {name=M10
+L=0.15
+W=0.70
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -940 30 0 0 {name=M11
+L=0.15
+W=0.70
+nf=1 
+mult=8
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} -940 -210 0 0 {name=M12
+L=0.15
+W=0.61
+nf=1
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} -1040 -210 0 1 {name=M13
+L=0.15
+W=0.61
+nf=1
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -1240 -130 0 0 {name=M14
+L=0.15
+W=0.70
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -1340 30 0 1 {name=M16
+L=0.15
+W=0.70
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -270 -90 0 0 {name=M2
+L=0.15
+W=1.06
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} 290 -90 0 1 {name=M3
+L=0.15
+W=1.06
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 0 -380 0 1 {name=l7 sig_type=std_logic lab=VPB}
+C {sky130_fd_pr/nfet_01v8.sym} -700 150 0 1 {name=M17
+L=0.15
+W=0.70
+nf=1 
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -470 -90 0 0 {name=M18
+L=0.15
+W=1.06
+nf=1 
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} 150 -210 0 1 {name=M19
+L=0.15
+W=0.61
+nf=1
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/pfet_01v8.sym} -130 -210 0 0 {name=M20
+L=0.15
+W=0.61
+nf=1
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} -540 150 0 1 {name=M4
+L=0.15
+W=0.70
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} -110 -210 0 1 {name=l10 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} -250 -210 0 1 {name=l11 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 410 -210 0 1 {name=l12 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 130 -210 0 0 {name=l13 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 270 -210 0 0 {name=l14 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} -560 -210 0 0 {name=l15 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} -1060 -210 0 0 {name=l16 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} -920 -210 0 1 {name=l18 sig_type=std_logic lab=VPB}
+C {devices/lab_pin.sym} 0 -350 0 1 {name=l19 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -250 -90 0 1 {name=l20 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -450 -90 0 1 {name=l21 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 270 -90 0 0 {name=l22 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 0 30 0 1 {name=l23 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} 410 150 0 1 {name=l24 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -560 150 0 0 {name=l25 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -720 150 0 0 {name=l26 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -920 30 0 1 {name=l27 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -1060 30 0 0 {name=l28 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -1360 30 0 0 {name=l29 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -1220 -130 0 1 {name=l30 sig_type=std_logic lab=VNB}
+C {sky130_fd_pr/nfet_01v8.sym} -1190 30 0 1 {name=M21
+L=0.15
+W=0.70
+nf=1 
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} -1210 30 0 0 {name=l31 sig_type=std_logic lab=VNB}
+C {sky130_fd_pr/pfet_01v8.sym} -810 -210 0 0 {name=M22
+L=0.15
+W=0.61
+nf=1
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} -790 -210 0 1 {name=l32 sig_type=std_logic lab=VPB}
+C {sky130_fd_pr/pfet_01v8.sym} -1340 -210 0 1 {name=M15
+L=4.20
+W=0.42
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} -1360 -210 0 0 {name=l33 sig_type=std_logic lab=VPB}
+C {sky130_fd_pr/nfet_01v8.sym} -800 30 0 0 {name=M23
+L=0.15
+W=0.70
+nf=1 
+mult=2
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} -780 30 0 1 {name=l17 sig_type=std_logic lab=VNB}
+C {devices/lab_pin.sym} -940 90 0 0 {name=l34 sig_type=std_logic lab=VNB}
+C {sky130_fd_pr/res_xhigh_po.sym} -920 90 0 0 {name=R2
+W=1.41
+L=0.70
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {sky130_fd_pr/pfet_01v8.sym} -270 -210 0 0 {name=M6
+L=0.15
+W=0.61
+nf=1
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {sky130_fd_pr/nfet_01v8.sym} 390 150 0 0 {name=M5
+L=0.30
+W=0.70
+nf=1 
+mult=4
+ad="'int((nf+1)/2) * W/nf * 0.29'" 
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'" 
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {devices/lab_pin.sym} 0 -320 0 1 {name=l1 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} 0 -410 0 1 {name=l5 sig_type=std_logic lab=VPWR}
+C {devices/lab_pin.sym} 0 60 3 0 {name=l35 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} 0 -240 3 1 {name=l36 sig_type=std_logic lab=VPWR}
+C {devices/lab_pin.sym} -560 180 3 0 {name=l2 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} 410 180 3 0 {name=l3 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} -720 180 3 0 {name=l8 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} -920 120 3 0 {name=l6 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} -1210 60 3 0 {name=l4 sig_type=std_logic lab=VGND}
+C {devices/lab_pin.sym} -450 -60 3 0 {name=l9 sig_type=std_logic lab=VGND}
diff --git a/xschem/sky130_sc_ams__ota_1.spice b/xschem/sky130_sc_ams__ota_1.spice
new file mode 100644
index 0000000..6c6fd48
--- /dev/null
+++ b/xschem/sky130_sc_ams__ota_1.spice
@@ -0,0 +1,88 @@
+.include /home/charana/IC/OpenLane/pdks/sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__nfet_01v8__tt.pm3.spice
+* SPICE3 file created from sky130_sd_ams__ota_1.ext - technology: sky130A
+.subckt sky130_sd_ams__ota_1 Vin1 Vin2 VGND VNB VPB VPWR Iout
+X0 a_599_75# a_1367_29# a_1311_55# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X1 Iout a_4632_123# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=300000u
+X2 a_4632_123# a_4632_123# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X3 VGND a_1367_29# a_3603_47# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X4 a_3603_47# a_1367_29# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X5 VPWR a_2270_413# a_2270_413# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=420000u l=4.2e+06u
+X6 a_599_75# a_1367_29# a_1311_55# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X7 VGND a_3603_375# a_3603_375# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X8 a_3603_375# a_3431_375# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X9 a_1311_55# a_2270_413# a_1367_29# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X10 a_3431_375# Vin2 a_3603_47# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X11 VGND a_3603_375# Iout VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=300000u
+X12 VPWR a_1311_55# a_1311_55# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X13 a_3603_375# a_3431_375# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X14 VPWR a_3431_375# a_3603_375# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X15 VGND VGND a_3431_375# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X16 VPWR a_1311_55# a_1311_55# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X17 a_3431_375# a_3431_375# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X18 a_1367_29# a_1367_29# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X19 a_1367_29# a_1311_55# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X20 Iout a_4632_123# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=300000u
+X21 a_4632_123# a_4632_123# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X22 a_1367_29# a_1367_29# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X23 VPWR a_4632_123# a_4632_123# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X24 a_3603_47# a_1367_29# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X25 a_599_75# a_1367_29# a_1311_55# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X26 a_3431_375# VGND VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X27 a_1367_29# a_2270_413# a_1311_55# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X28 a_1367_29# VGND VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X29 a_3603_47# Vin2 a_3431_375# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X30 a_3603_375# VGND VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X31 a_1367_29# a_1311_55# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X32 VPWR a_3431_375# a_3603_375# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X33 a_599_75# a_1367_29# a_1311_55# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X34 VPWR a_1311_55# a_1367_29# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X35 VPWR VPWR a_3431_375# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X36 VGND a_599_75# VNB sky130_fd_pr__res_xhigh_po w=1.41e+06u l=700000u
+X37 VGND VGND a_1311_55# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X38 VGND a_1367_29# a_3603_47# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X39 a_4632_123# VPWR VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X40 VPWR a_4632_123# Iout VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=300000u
+X41 VPWR VPWR a_4632_123# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X42 a_1311_55# a_1367_29# a_599_75# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X43 VGND a_3603_375# Iout VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=300000u
+X44 VGND a_1367_29# a_2270_413# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X45 VGND VGND a_3603_375# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X46 a_1311_55# a_1367_29# a_599_75# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X47 a_1311_55# a_2270_413# a_1367_29# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X48 VGND a_1367_29# a_1367_29# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X49 a_3603_47# Vin2 a_3431_375# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X50 a_3603_47# Vin1 a_4632_123# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X51 a_3431_375# a_3431_375# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X52 a_4632_123# Vin1 a_3603_47# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X53 VPWR a_1311_55# a_1367_29# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X54 a_1311_55# a_1367_29# a_599_75# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X55 a_2270_413# a_1367_29# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X56 a_1311_55# a_1311_55# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X57 VPWR VPWR a_1311_55# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X58 VPWR a_4632_123# a_4632_123# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X59 VPWR a_4632_123# Iout VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=300000u
+X60 a_3603_375# a_3603_375# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X61 Iout a_3603_375# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=300000u
+X62 a_1311_55# a_1367_29# a_599_75# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X63 a_2270_413# a_1367_29# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X64 a_3431_375# VPWR VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X65 VGND a_1367_29# a_2270_413# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X66 a_4632_123# Vin1 a_3603_47# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X67 a_3603_375# a_3603_375# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X68 a_1311_55# VPWR VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X69 VPWR a_3431_375# a_3431_375# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X70 VPWR a_3431_375# a_3431_375# VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X71 a_1367_29# a_2270_413# a_1311_55# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X72 VGND a_1367_29# a_1367_29# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X73 a_3603_47# Vin1 a_4632_123# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X74 Iout a_3603_375# VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=300000u
+X75 a_3431_375# Vin2 a_3603_47# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=1.06e+06u l=150000u
+X76 a_1311_55# a_1311_55# VPWR VPB sky130_fd_pr__pfet_01v8 ad=0p pd=0u as=0p ps=0u w=610000u l=150000u
+X77 a_1311_55# VGND VGND VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X78 VGND VGND a_1367_29# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+X79 VGND a_3603_375# a_3603_375# VNB sky130_fd_pr__nfet_01v8 ad=0p pd=0u as=0p ps=0u w=700000u l=150000u
+C0 a_599_75# a_1311_55# 2.09fF
+C1 a_3603_47# VGND 2.61fF
+C2 a_1367_29# VGND 2.16fF
+C3 a_1367_29# VNB 2.36fF
+.ends
diff --git a/xschem/sky130_sc_ams__ota_1.sym b/xschem/sky130_sc_ams__ota_1.sym
new file mode 100644
index 0000000..de2743d
--- /dev/null
+++ b/xschem/sky130_sc_ams__ota_1.sym
@@ -0,0 +1,38 @@
+v {xschem version=2.9.9 file_version=1.2 }
+G {}
+K {type=subcircuit
+format="@name @pinlist @symname"
+template="name=x1"
+}
+V {}
+S {}
+E {}
+L 4 -80 -20 -60 -20 {}
+L 4 -80 20 -60 20 {}
+L 4 -60 -60 -60 60 {}
+L 4 -60 60 60 0 {}
+L 4 -60 -60 60 0 {}
+L 4 -50 -20 -30 -20 {}
+L 4 -40 -30 -40 -10 {}
+L 4 -50 20 -30 20 {}
+L 4 -10 35 -10 60 {}
+L 4 10 25 10 60 {}
+L 4 -10 -60 -10 -35 {}
+L 4 10 -60 10 -25 {}
+L 4 60 -0 80 -0 {}
+B 5 7.5 -62.5 12.5 -57.5 {name=VPWR dir=in }
+B 5 -12.5 -62.5 -7.5 -57.5 {name=VPB dir=in }
+B 5 -12.5 57.5 -7.5 62.5 {name=VNB dir=in }
+B 5 7.5 57.5 12.5 62.5 {name=VGND dir=in }
+B 5 -82.5 -22.5 -77.5 -17.5 {name=Vin1 dir=in }
+B 5 -82.5 17.5 -77.5 22.5 {name=Vin2 dir=in }
+B 5 77.5 -2.5 82.5 2.5 {name=Iout dir=out }
+T {@symname} 22 -46 0 0 0.3 0.3 {}
+T {@name} -65 -82 0 0 0.2 0.2 {}
+T {VPWR} 46.5 -50 2 0 0.2 0.2 {}
+T {VPB} -16 -50 2 0 0.2 0.2 {}
+T {VNB} -36.5 50 0 0 0.2 0.2 {}
+T {VGND} 15 48.5 0 0 0.2 0.2 {}
+T {Vin1} -85 -39 0 0 0.2 0.2 {}
+T {Vin2} -85 26 0 0 0.2 0.2 {}
+T {Iout} 75 -19 0 1 0.2 0.2 {}
diff --git a/xschem/user_analog_project_wrapper.sch b/xschem/user_analog_project_wrapper.sch
index 8a3e33e..97c4382 100644
--- a/xschem/user_analog_project_wrapper.sch
+++ b/xschem/user_analog_project_wrapper.sch
@@ -11,8 +11,60 @@
 N -430 -540 -430 -510 { lab=io_analog[1]}
 N -390 -340 -350 -340 { lab=vssa1}
 N -580 -340 -550 -340 { lab=io_analog[5]}
-N -510 -280 -510 -260 {}
-N -430 -280 -430 -260 {}
+N -510 -280 -510 -260 {
+lab=io_analog[2]}
+N -430 -280 -430 -260 {
+lab=io_analog[3]}
+N 280 -460 280 -400 {
+lab=vssa1}
+N 280 -460 300 -460 {
+lab=vssa1}
+N 300 -460 300 -400 {
+lab=vssa1}
+N 290 -560 290 -460 {
+lab=vssa1}
+N 280 -280 280 -220 {
+lab=vccd1}
+N 280 -220 300 -220 {
+lab=vccd1}
+N 300 -280 300 -220 {
+lab=vccd1}
+N 290 -220 290 -160 {
+lab=vccd1}
+N 820 -460 820 -390 {
+lab=vssa1}
+N 820 -460 840 -460 {
+lab=vssa1}
+N 840 -460 840 -390 {
+lab=vssa1}
+N 830 -540 830 -460 {
+lab=vssa1}
+N 830 -560 830 -540 {
+lab=vssa1}
+N 820 -270 820 -220 {
+lab=vccd1}
+N 820 -220 840 -220 {
+lab=vccd1}
+N 840 -270 840 -220 {
+lab=vccd1}
+N 830 -220 830 -160 {
+lab=vccd1}
+N 700 -330 760 -330 {
+lab=io_in[13]}
+N 920 -330 960 -330 {
+lab=io_out[13]}
+N 960 -330 1000 -330 {
+lab=io_out[13]}
+N 700 -300 760 -300 {
+lab=io_analog[6]}
+N 700 -360 760 -360 {
+lab=io_analog[7]}
+N 370 -340 440 -340 {
+lab=gpio_analog[6]}
+N 120 -360 210 -360 {
+lab=gpio_analog[7]}
+N 120 -320 210 -320 {
+lab=gpio_analog[8]}
 C {devices/lab_pin.sym} -430 -540 2 0 {name=l1 lab=io_analog[1]}
 C {devices/lab_pin.sym} -510 -540 0 0 {name=l2 lab=io_analog[0]}
 C {devices/lab_pin.sym} -580 -380 0 0 {name=l3 lab=io_analog[4]}
@@ -53,3 +105,24 @@
 C {devices/iopin.sym} -1070 -140 0 0 {name=p37 lab=io_clamp_low[2:0]}
 C {devices/opin.sym} -1050 -70 0 0 {name=p38 lab=user_irq[2:0]}
 C {devices/ipin.sym} -1030 -460 0 0 {name=p39 lab=la_oenb[127:0]}
+C {sky130_sc_ams__ota_1.sym} 290 -340 0 0 {name=x2}
+C {sky130_sc_ams__comparator_1.sym} 830 -330 0 0 {name=x3}
+C {devices/lab_pin.sym} 290 -560 0 0 {name=l7 sig_type=std_logic lab=vssa1}
+C {devices/lab_pin.sym} 290 -160 0 0 {name=l8 sig_type=std_logic lab=vccd1
+}
+C {devices/lab_pin.sym} 830 -160 0 0 {name=l10 sig_type=std_logic lab=vccd1}
+C {devices/lab_pin.sym} 830 -560 0 0 {name=l11 sig_type=std_logic lab=vssa1
+}
+C {devices/lab_pin.sym} 700 -330 0 0 {name=l12 sig_type=std_logic lab=io_in[13]
+}
+C {devices/lab_pin.sym} 1000 -330 2 0 {name=l13 sig_type=std_logic lab=io_out[13]
+}
+C {devices/lab_pin.sym} 700 -360 0 0 {name=l14 sig_type=std_logic lab=io_analog[7]
+}
+C {devices/lab_pin.sym} 700 -300 0 0 {name=l15 sig_type=std_logic lab=io_analog[6]
+}
+C {devices/lab_pin.sym} 440 -340 2 0 {name=l16 sig_type=std_logic lab=gpio_analog[6]}
+C {devices/lab_pin.sym} 120 -360 0 0 {name=l17 sig_type=std_logic lab=gpio_analog[7]
+}
+C {devices/lab_pin.sym} 120 -320 0 0 {name=l18 sig_type=std_logic lab=gpio_analog[8]
+}