diff --git a/xschem/tb/comparator/tran_comparator_trim.sch b/xschem/tb/comparator/tran_comparator_trim.sch
index d9ec238..6f179d5 100644
--- a/xschem/tb/comparator/tran_comparator_trim.sch
+++ b/xschem/tb/comparator/tran_comparator_trim.sch
@@ -61,7 +61,7 @@
 N 80 -440 80 -410 { lab=en}
 N 1060 -50 1180 -50 { lab=rstn}
 N 450 -320 450 -290 { lab=rstn}
-C {adc/comparator/comparator.sym} 610 -330 0 0 {name=xcom}
+C {sar/comparator/comparator.sym} 610 -330 0 0 {name=xcom}
 C {devices/vsource.sym} 180 -530 0 0 {name=V1 value=0}
 C {devices/vsource.sym} 80 -530 0 0 {name=V2 value=1.4
 }
diff --git a/xschem/tb/sar/tr_sar.sch b/xschem/tb/sar/tr_sar.sch
index f40305a..eb8b278 100644
--- a/xschem/tb/sar/tr_sar.sch
+++ b/xschem/tb/sar/tr_sar.sch
@@ -6,75 +6,82 @@
 E {}
 P 4 5 0 -660 1370 -660 1370 0 0 0 0 -660 {}
 P 4 2 500 -660 500 0 {}
-P 4 2 500 -310 0 -310 {}
-N 900 -220 930 -220 { lab=vss}
-N 900 -220 900 -190 { lab=vss}
-N 820 -220 820 -190 { lab=vdd}
-N 820 -130 820 -90 { lab=GND}
-N 900 -130 900 -90 { lab=GND}
-N 740 -220 770 -220 { lab=vinn}
-N 740 -220 740 -190 { lab=vinn}
-N 740 -130 740 -90 { lab=GND}
-N 640 -220 670 -220 { lab=vinp}
-N 640 -220 640 -190 { lab=vinp}
-N 640 -130 640 -90 { lab=GND}
-N 820 -220 850 -220 { lab=vdd}
-N 940 -450 1020 -450 { lab=result[7:0]}
-N 710 -360 710 -330 { lab=vss}
-N 750 -360 750 -330 { lab=vss}
-N 710 -570 710 -540 { lab=vdd}
-N 750 -570 750 -540 { lab=vdd}
-N 580 -400 610 -400 { lab=vinn}
-N 580 -500 610 -500 { lab=vinp}
-N 1090 -220 1120 -220 { lab=clk}
-N 1090 -220 1090 -190 { lab=clk}
-N 1090 -130 1090 -90 { lab=GND}
-N 840 -360 840 -330 { lab=clk}
-N 1090 -500 1120 -500 { lab=en}
-N 1090 -500 1090 -470 { lab=en}
-N 1090 -410 1090 -370 { lab=GND}
-N 870 -360 870 -330 { lab=en}
-N 940 -420 990 -420 { lab=valid}
-N 970 -220 1000 -220 { lab=cal}
-N 970 -220 970 -190 { lab=cal}
-N 970 -130 970 -90 { lab=GND}
-N 840 -570 840 -540 { lab=cal}
-N 50 -460 70 -460 { lab=GND}
-N 50 -600 70 -600 { lab=GND}
-N 50 -530 70 -530 { lab=GND}
-N 50 -390 70 -390 { lab=GND}
-N 540 -220 540 -190 { lab=rstn}
-N 540 -130 540 -90 { lab=GND}
-N 540 -220 570 -220 { lab=rstn}
-N 890 -360 890 -330 { lab=rstn}
-C {vsource.sym} 900 -160 0 0 {name=V1 value=0}
-C {vsource.sym} 820 -160 0 0 {name=V2 value=1.4
+P 4 2 -0 -250 500 -250 {}
+N 940 -220 970 -220 {lab=vss}
+N 940 -220 940 -190 {lab=vss}
+N 860 -220 860 -190 {lab=vdd}
+N 860 -130 860 -90 {lab=GND}
+N 940 -130 940 -90 {lab=GND}
+N 780 -220 810 -220 {lab=vinn}
+N 780 -220 780 -190 {lab=vinn}
+N 780 -130 780 -90 {lab=GND}
+N 680 -220 710 -220 {lab=vinp}
+N 680 -220 680 -190 {lab=vinp}
+N 680 -130 680 -90 {lab=GND}
+N 860 -220 890 -220 {lab=vdd}
+N 940 -450 1020 -450 {lab=result[7:0]}
+N 710 -360 710 -330 {lab=vss}
+N 750 -360 750 -330 {lab=vss}
+N 710 -570 710 -540 {lab=vdd}
+N 750 -570 750 -540 {lab=vdd}
+N 580 -400 610 -400 {lab=vinn}
+N 580 -500 610 -500 {lab=vinp}
+N 1130 -220 1160 -220 {lab=clk}
+N 1130 -220 1130 -190 {lab=clk}
+N 1130 -130 1130 -90 {lab=GND}
+N 840 -360 840 -330 {lab=clk}
+N 1090 -500 1120 -500 {lab=en}
+N 1090 -500 1090 -470 {lab=en}
+N 1090 -410 1090 -370 {lab=GND}
+N 870 -360 870 -330 {lab=en}
+N 940 -420 990 -420 {lab=valid}
+N 1010 -220 1040 -220 {lab=cal}
+N 1010 -220 1010 -190 {lab=cal}
+N 1010 -130 1010 -90 {lab=GND}
+N 840 -570 840 -540 {lab=cal}
+N 580 -220 580 -190 {lab=rstn}
+N 580 -130 580 -90 {lab=GND}
+N 580 -220 610 -220 {lab=rstn}
+N 890 -360 890 -330 {lab=rstn}
+C {devices/vsource.sym} 940 -160 0 0 {name=V1 value=0}
+C {devices/vsource.sym} 860 -160 0 0 {name=V2 value=1.4}
+C {devices/lab_wire.sym} 970 -220 0 0 {name=l7 sig_type=std_logic lab=vss}
+C {devices/lab_wire.sym} 890 -220 0 0 {name=l8 sig_type=std_logic lab=vdd}
+C {devices/gnd.sym} 860 -90 0 0 {name=l11 lab=GND}
+C {devices/gnd.sym} 940 -90 0 0 {name=l12 lab=GND}
+C {devices/vsource.sym} 780 -160 0 0 {name=V4 value=vsign}
+C {devices/lab_wire.sym} 810 -220 0 0 {name=l17 sig_type=std_logic lab=vinn}
+C {devices/gnd.sym} 780 -90 0 0 {name=l18 lab=GND}
+C {devices/vsource.sym} 680 -160 0 0 {name=V5 value=vsigp}
+C {devices/lab_wire.sym} 710 -220 0 0 {name=l19 sig_type=std_logic lab=vinp}
+C {devices/gnd.sym} 680 -90 0 0 {name=l20 lab=GND}
+C {devices/code.sym} 340 -170 0 0 {
+name=STDCELLS 
+only_toplevel=false 
+format="tcleval( @value )"
+value="
+.include \\\\$::SKYWATER_STDCELLS\\\\/cells/inv/sky130_fd_sc_hd__inv_4.spice
+.include \\\\$::SKYWATER_STDCELLS\\\\/cells/decap/sky130_fd_sc_hd__decap_8.spice
+.include \\\\$::SKYWATER_STDCELLS\\\\/cells/decap/sky130_fd_sc_hd__decap_3.spice
+.include \\\\$::SKYWATER_STDCELLS\\\\/cells/buf/sky130_fd_sc_hd__buf_1.spice
+.include \\\\$::SKYWATER_STDCELLS\\\\/cells/inv/sky130_fd_sc_hd__inv_1.spice
+.include \\\\$::SKYWATER_STDCELLS\\\\/cells/inv/sky130_fd_sc_hd__inv_2.spice
+.include \\\\$::SKYWATER_STDCELLS\\\\/cells/tap/sky130_fd_sc_hd__tap_2.spice"
 }
-C {lab_wire.sym} 930 -220 0 0 {name=l7 sig_type=std_logic lab=vss}
-C {lab_wire.sym} 850 -220 0 0 {name=l8 sig_type=std_logic lab=vdd}
-C {gnd.sym} 820 -90 0 0 {name=l11 lab=GND}
-C {gnd.sym} 900 -90 0 0 {name=l12 lab=GND}
-C {vsource.sym} 740 -160 0 0 {name=V4 value=vsign
-}
-C {lab_wire.sym} 770 -220 0 0 {name=l17 sig_type=std_logic lab=vinn}
-C {gnd.sym} 740 -90 0 0 {name=l18 lab=GND}
-C {vsource.sym} 640 -160 0 0 {name=V5 value=vsigp
-}
-C {lab_wire.sym} 670 -220 0 0 {name=l19 sig_type=std_logic lab=vinp}
-C {gnd.sym} 640 -90 0 0 {name=l20 lab=GND}
-C {code.sym} 270 -450 0 0 {name=STDCELLS only_toplevel=false 
-format="tcleval(@value )"
-value="[sky130_models]"}
-C {code.sym} 80 -140 0 0 {name=CTL 
-only_toplevel=false
-format="tcleval(@value )"
-value="*sar control
-
-*.options method trap
+C {devices/code.sym} 40 -170 0 0 {
+name=NGSPICE 
+only_toplevel=false 
+format="tcleval( @value )"
+value=".options method trap
 *.options method gear
+.options gmin 1e-15
+.options abstol 1e-15
+.options reltol 0.0001
+.options vntol 0.1e-6
+.options warn 1
 
 .param MC_SWITCH=0
-.param vin=0.05
+.param vin=1
 .param vcm=0.7
 .param vsigp=\\"\{vcm + vin/2\}\\"
 .param vsign=\\"\{vcm - vin/2\}\\"
@@ -94,6 +101,23 @@
 meas tran d6 find v(xsar.res6) at=47e-6
 meas tran d7 find v(xsar.res7) at=47e-6
 
+* meas tran d0 find v(xsar.result0) at=47e-6
+* meas tran d1 find v(xsar.result1) at=47e-6
+* meas tran d2 find v(xsar.result2) at=47e-6
+* meas tran d3 find v(xsar.result3) at=47e-6
+* meas tran d4 find v(xsar.result4) at=47e-6
+* meas tran d5 find v(xsar.result5) at=47e-6
+* meas tran d6 find v(xsar.result6) at=47e-6
+* meas tran d7 find v(xsar.result7) at=47e-6
+
+meas tran vpmax max xsar.vp
+meas tran vpmin min xsar.vp
+meas tran vpend find v(xsar.vp) at=39e-6
+
+meas tran vnmax max xsar.vn
+meas tran vnmin min xsar.vn
+meas tran vnend find v(xsar.vn) at=39e-6
+
 print d0
 print d1
 print d2
@@ -103,44 +127,37 @@
 print d6
 print d7
 
-eprvcd xsar.dclk xsar.den xsar.dsamp xsar.dctlp0 xsar.dctlp1 xsar.dctlp2 xsar.dctlp3 xsar.dctlp4 xsar.dctlp5 xsar.dctlp6 xsar.dctlp7 xsar.dctln0 xsar.dctln1 xsar.dctln2 xsar.dctln3 xsar.dctln4 xsar.dctln5 xsar.dctln6 xsar.dctln7 xsar.dcomp xsar.dsamp xsar.dvalid xsar.dtrim4 xsar.dtrim3 xsar.dtrim2 xsar.dtrim1 xsar.dtrim0 xsar.dtrimb4 xsar.dtrimb3 xsar.dtrimb2 xsar.dtrimb1 xsar.dtrimb0 xsar.dres0 xsar.dres1 xsar.dres2 xsar.dres3 xsar.dres4 xsar.dres5 xsar.dres6 xsar.dres7  > sarlogic.vcd
-display > \\"$design_path/sim/sar_nets.txt\\"
-edisplay > \\"$design_path/sim/sar_enets.txt\\"
-write sar_tb.raw
-*shell gtkwave \\"$design_path/sim/sarlogic.vcd\\" --script \\"$design_path/tools/scripts/gtkwave/nggtk.tcl\\" &
+print vpmax
+print vpmin
 
-.endc
-.end
-"
-tclcommand="exec xterm -geometry 100x40 -e nvim \\$::DESIGN_PATH\\/tb/sar/ctl.sp"}
-C {lab_wire.sym} 940 -450 0 1 {name=l15 sig_type=std_logic lab=result[7:0]
-}
-C {lab_wire.sym} 710 -360 3 0 {name=l16 sig_type=std_logic lab=vss}
-C {lab_wire.sym} 750 -360 3 0 {name=l23 sig_type=std_logic lab=vss}
-C {lab_wire.sym} 710 -540 3 1 {name=l24 sig_type=std_logic lab=vdd}
-C {lab_wire.sym} 750 -540 3 1 {name=l25 sig_type=std_logic lab=vdd}
-C {lab_wire.sym} 610 -400 0 0 {name=l27 sig_type=std_logic lab=vinn}
-C {lab_wire.sym} 610 -500 0 0 {name=l28 sig_type=std_logic lab=vinp}
-C {vsource.sym} 1090 -160 0 0 {name=Vclk value="PULSE(0 1 1e-9 1e-9 1e-9 2e-6 4e-6)"
-}
-C {lab_wire.sym} 1120 -220 0 0 {name=l31 sig_type=std_logic lab=clk
-}
-C {gnd.sym} 1090 -90 0 0 {name=l32 lab=GND}
-C {lab_wire.sym} 840 -360 3 0 {name=l33 sig_type=std_logic lab=clk
-}
-C {vsource.sym} 1090 -440 0 0 {name=Ven value="PULSE(0 1 0.5e-6 0.1e-6 0.1e-6 10e-6 10e-3)"
-}
-C {lab_wire.sym} 1120 -500 0 0 {name=l35 sig_type=std_logic lab=en
-}
-C {gnd.sym} 1090 -370 0 0 {name=l36 lab=GND}
-C {lab_wire.sym} 870 -360 3 0 {name=l37 sig_type=std_logic lab=en
-}
-C {code.sym} 240 -140 0 0 {name=CORNERS
-only_toplevel=true
+print vnmax
+print vnmin
+
+print vpend
+print vnend
+
+.endc"}
+C {devices/lab_wire.sym} 940 -450 0 1 {name=l15 sig_type=std_logic lab=result[7:0]}
+C {devices/lab_wire.sym} 710 -360 3 0 {name=l16 sig_type=std_logic lab=vss}
+C {devices/lab_wire.sym} 750 -360 3 0 {name=l23 sig_type=std_logic lab=vss}
+C {devices/lab_wire.sym} 710 -540 3 1 {name=l24 sig_type=std_logic lab=vdd}
+C {devices/lab_wire.sym} 750 -540 3 1 {name=l25 sig_type=std_logic lab=vdd}
+C {devices/lab_wire.sym} 610 -400 0 0 {name=l27 sig_type=std_logic lab=vinn}
+C {devices/lab_wire.sym} 610 -500 0 0 {name=l28 sig_type=std_logic lab=vinp}
+C {devices/vsource.sym} 1130 -160 0 0 {name=Vclk value="PULSE(0 1 1e-9 1e-9 1e-9 2e-6 4e-6)"}
+C {devices/lab_wire.sym} 1160 -220 0 0 {name=l31 sig_type=std_logic lab=clk}
+C {devices/gnd.sym} 1130 -90 0 0 {name=l32 lab=GND}
+C {devices/lab_wire.sym} 840 -360 3 0 {name=l33 sig_type=std_logic lab=clk}
+C {devices/vsource.sym} 1090 -440 0 0 {name=Ven value="PULSE(0 1 0.5e-6 0.1e-6 0.1e-6 10e-6 10e-3)"}
+C {devices/lab_wire.sym} 1120 -500 0 0 {name=l35 sig_type=std_logic lab=en}
+C {devices/gnd.sym} 1090 -370 0 0 {name=l36 lab=GND}
+C {devices/lab_wire.sym} 870 -360 3 0 {name=l37 sig_type=std_logic lab=en}
+C {devices/code.sym} 190 -170 0 0 {
+name=CORNERS 
+only_toplevel=true 
 format="tcleval( @value )"
 spice_ignore="tcleval($cmdline_ignore)"
-value="
-* FET CORNERS
+value="* FET CORNERS
 .include \\\\$::SKYWATER_MODELS\\\\/corners/tt.spice
 *.include \\\\$::SKYWATER_MODELS\\\\/corners/ff.spice
 *.include \\\\$::SKYWATER_MODELS\\\\/corners/ss.spice
@@ -176,55 +193,18 @@
 *.include \\\\$::SKYWATER_MODELS\\\\/corners/fs_rmax_cmax.spice
 *.include \\\\$::SKYWATER_MODELS\\\\/corners/fs_rmin_cmin.spice
 *.include \\\\$::SKYWATER_MODELS\\\\/corners/fs_rmax_cmin.spice
-*.include \\\\$::SKYWATER_MODELS\\\\/corners/fs_rmin_cmax.spice
-"}
-C {lab_wire.sym} 940 -420 0 1 {name=l38 sig_type=std_logic lab=valid
-}
-C {noconn.sym} 990 -420 2 0 {name=l39}
-C {vsource.sym} 970 -160 0 0 {name=V3 value=0
-}
-C {lab_wire.sym} 1000 -220 0 0 {name=l40 sig_type=std_logic lab=cal
-}
-C {gnd.sym} 970 -90 0 0 {name=l43 lab=GND}
-C {lab_wire.sym} 840 -540 3 1 {name=l44 sig_type=std_logic lab=cal
-}
-C {xschem_sky130/sky130_stdcells/inv_4.sym} 110 -460 0 0 {name=x2 VGND=VGND VNB=VNB VPB=VPB VPWR=VPWR prefix=sky130_fd_sc_hd__ }
-C {noconn.sym} 150 -460 2 0 {name=l41}
-C {gnd.sym} 50 -460 0 0 {name=l42 lab=GND}
-C {xschem_sky130/sky130_stdcells/decap_8.sym} 330 -620 0 0 {name=x6 VGND=vss VNB=vss VPB=vdd VPWR=vdd prefix=sky130_fd_sc_hd__ 
-}
-C {xschem_library/devices/launcher.sym} 150 -260 0 0 {name=h1
-descr="simulation netlist"
-tclcommand="set dummy_ignore true"
-}
-C {xschem_sky130/sky130_stdcells/decap_3.sym} 330 -580 0 0 {name=x8 VGND=vss VNB=vss VPB=vdd VPWR=vdd prefix=sky130_fd_sc_hd__ 
-}
-C {noconn.sym} 1020 -450 2 0 {name=l49[7:0]
-}
-C {gnd.sym} 50 -600 0 0 {name=l2 lab=GND}
-C {noconn.sym} 150 -600 2 0 {name=l3}
-C {xschem_sky130/sky130_stdcells/buf_1.sym} 110 -600 0 0 {name=x3 VGND=vss VNB=vss VPB=vdd VPWR=vdd prefix=sky130_fd_sc_hd__ 
-}
-C {sar/sar/sar.sym} 890 -270 0 0 {name=xsar
-}
-C {gnd.sym} 50 -530 0 0 {name=l10 lab=GND}
-C {noconn.sym} 150 -530 2 0 {name=l13}
-C {xschem_sky130/sky130_stdcells/inv_1.sym} 110 -530 0 0 {name=x4 VGND=vss VNB=vss VPB=vdd VPWR=vdd prefix=sky130_fd_sc_hd__ 
-}
-C {xschem_sky130/sky130_stdcells/inv_2.sym} 110 -390 0 0 {name=x1 VGND=vss VNB=vss VPB=vdd VPWR=vdd prefix=sky130_fd_sc_hd__ 
-}
-C {gnd.sym} 50 -390 0 0 {name=l1 lab=GND}
-C {noconn.sym} 150 -390 2 0 {name=l4}
-C {vsource.sym} 540 -160 0 0 {name=V7 value=1.4
-}
-C {lab_wire.sym} 570 -220 0 0 {name=l5 sig_type=std_logic lab=rstn
-}
-C {gnd.sym} 540 -90 0 0 {name=l6 lab=GND}
-C {lab_wire.sym} 890 -360 3 0 {name=l9 sig_type=std_logic lab=rstn
-}
-C {xschem_sky130/sky130_stdcells/tap_2.sym} 330 -540 0 0 {name=x5 VGND=vss VNB=vss VPB=vdd VPWR=vdd prefix=sky130_fd_sc_hd__ 
-}
-C {xschem_library/devices/launcher.sym} 150 -210 0 0 {name=h2
-descr="lvs netlist"
-tclcommand="set dummy_ignore false"
-}
+*.include \\\\$::SKYWATER_MODELS\\\\/corners/fs_rmin_cmax.spice"}
+C {devices/lab_wire.sym} 940 -420 0 1 {name=l38 sig_type=std_logic lab=valid}
+C {devices/noconn.sym} 990 -420 2 0 {name=l39}
+C {devices/vsource.sym} 1010 -160 0 0 {name=V3 value=0}
+C {devices/lab_wire.sym} 1040 -220 0 0 {name=l40 sig_type=std_logic lab=cal}
+C {devices/gnd.sym} 1010 -90 0 0 {name=l43 lab=GND}
+C {devices/lab_wire.sym} 840 -540 3 1 {name=l44 sig_type=std_logic lab=cal}
+C {devices/launcher.sym} 200 -480 0 0 {name=h1 descr="simulation netlist" tclcommand="set dummy_ignore true"}
+C {devices/noconn.sym} 1020 -450 2 0 {name=l49[7:0]}
+C {sar/sar/sar.sym} 890 -270 0 0 {name=xsar}
+C {devices/vsource.sym} 580 -160 0 0 {name=V7 value=1.4}
+C {devices/lab_wire.sym} 610 -220 0 0 {name=l5 sig_type=std_logic lab=rstn}
+C {devices/gnd.sym} 580 -90 0 0 {name=l6 lab=GND}
+C {devices/lab_wire.sym} 890 -360 3 0 {name=l9 sig_type=std_logic lab=rstn}
+C {devices/launcher.sym} 200 -430 0 0 {name=h2 descr="lvs netlist" tclcommand="set dummy_ignore false"}