adding ota + comparator mag and xscheme files
diff --git a/mag/sky130_sc_ams__comparator_1.mag b/mag/sky130_sc_ams__comparator_1.mag
new file mode 100644
index 0000000..3cafbb0
--- /dev/null
+++ b/mag/sky130_sc_ams__comparator_1.mag
@@ -0,0 +1,1499 @@
+magic
+tech sky130A
+magscale 1 2
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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 locali 652 161 686 195 0 FreeSans 192 0 0 0 VIN2
+port 3 nsew
+flabel locali 652 297 686 331 0 FreeSans 192 0 0 0 VIN1
+port 2 nsew
+flabel locali 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
+<< 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..5c0cae4
--- /dev/null
+++ b/mag/sky130_sc_ams__ota_1.mag
@@ -0,0 +1,2435 @@
+magic
+tech sky130A
+magscale 1 2
+timestamp 1635177953
+<< nwell >>
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+<< pmos >>
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+<< ndiff >>
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+<< poly >>
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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
+<< 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 locali 6657 366 6691 400 0 FreeSans 192 0 0 0 Iout
+port 4 nsew
+flabel locali 6657 298 6691 332 0 FreeSans 192 0 0 0 Iout
+port 4 nsew
+flabel locali 6657 230 6691 264 0 FreeSans 192 0 0 0 Iout
+port 4 nsew
+flabel locali 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/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 {}
