Add xschem schematic for both ldo and ota
diff --git a/netlists/ldo.sch b/netlists/ldo.sch
new file mode 100644
index 0000000..e7a7da1
--- /dev/null
+++ b/netlists/ldo.sch
@@ -0,0 +1,212 @@
+v {xschem version=2.9.9 file_version=1.2 }
+G {}
+K {}
+V {}
+S {}
+E {}
+N -170 -1140 -170 -1130 { lab=#net1}
+N -170 -1130 -20 -1130 { lab=#net1}
+N -20 -1140 -20 -1130 { lab=#net1}
+N -90 -1130 -90 -1060 { lab=#net1}
+N -270 -1080 -270 -1060 { lab=iref}
+N -270 -1080 -230 -1080 { lab=iref}
+N -230 -1080 -230 -1030 { lab=iref}
+N -230 -1030 -130 -1030 { lab=iref}
+N -250 -1170 -210 -1170 { lab=vref}
+N 20 -1170 60 -1170 { lab=vfb}
+N 120 -1250 120 -1070 { lab=c}
+N 120 -1070 120 -1060 { lab=c}
+N -170 -1250 -170 -1200 { lab=#net2}
+N -20 -1250 -20 -1200 { lab=cc}
+N -130 -1280 -60 -1280 { lab=#net3}
+N -20 -1240 70 -1240 { lab=cc}
+N 70 -1280 70 -1240 { lab=cc}
+N 70 -1280 80 -1280 { lab=cc}
+N -170 -1330 -170 -1310 { lab=VDD}
+N -20 -1330 -20 -1310 { lab=VDD}
+N 120 -1330 120 -1310 { lab=VDD}
+N -170 -1330 -20 -1330 { lab=VDD}
+N -20 -1330 120 -1330 { lab=VDD}
+N -20 -1330 120 -1330 { lab=VDD}
+N 120 -1330 280 -1330 { lab=VDD}
+N 280 -1250 280 -1230 { lab=out}
+N 280 -1170 280 -1150 { lab=vfb}
+N 280 -1090 280 -1000 { lab=GND}
+N 230 -1160 280 -1160 { lab=vfb}
+N -270 -1130 -270 -1080 { lab=iref}
+N -270 -1000 -270 -980 { lab=GND}
+N -90 -1000 -90 -980 { lab=GND}
+N 120 -1000 120 -980 { lab=GND}
+N 280 -1240 340 -1240 { lab=out}
+N 120 -1220 150 -1220 { lab=c}
+N -270 -980 280 -980 { lab=GND}
+N 280 -1000 280 -980 { lab=GND}
+N 230 -1120 260 -1120 { lab=GND}
+N 190 -1120 230 -1120 { lab=GND}
+N 190 -1120 190 -980 { lab=GND}
+N 190 -1200 260 -1200 { lab=GND}
+N 190 -1200 190 -1120 { lab=GND}
+N 150 -1220 220 -1220 { lab=c}
+N 220 -1280 220 -1220 { lab=c}
+N 220 -1280 240 -1280 { lab=c}
+N -150 -1080 -150 -1030 { lab=iref}
+N -150 -1080 60 -1080 { lab=iref}
+N 60 -1080 60 -1030 { lab=iref}
+N 60 -1030 80 -1030 { lab=iref}
+N 280 -1330 280 -1310 {}
+C {sky130_fd_pr/nfet3_01v8.sym} -250 -1030 0 1 {name=M1
+L=1
+W=10
+body=GND
+nf=2
+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/nfet3_01v8.sym} -110 -1030 0 0 {name=M2
+L=1
+W=10
+body=GND
+nf=2
+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/nfet3_01v8.sym} 100 -1030 0 0 {name=M3
+L=1
+W=60
+body=GND
+nf=12
+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/nfet3_01v8.sym} -190 -1170 0 0 {name=M4
+L=1
+W=2
+body=GND
+nf=2
+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/nfet3_01v8.sym} 0 -1170 0 1 {name=M5
+L=1
+W=2
+body=GND
+nf=2
+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/pfet3_01v8.sym} 100 -1280 0 0 {name=M6
+L=1
+W=50
+body=VDD
+nf=12
+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/pfet3_01v8.sym} -40 -1280 0 0 {name=M7
+L=1
+W=12
+body=VDD
+nf=4
+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/pfet3_01v8.sym} -150 -1280 0 1 {name=M8
+L=1
+W=12
+body=VDD
+nf=4
+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/pfet3_01v8.sym} 260 -1280 0 0 {name=M9
+L=1
+W=126
+body=VDD
+nf=18
+mult=5
+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/res_xhigh_po.sym} 280 -1200 0 0 {name=R1
+W=0.35
+L=1.75
+model=res_xhigh_po
+spiceprefix=X
+mult=8}
+C {sky130_fd_pr/res_xhigh_po.sym} 280 -1120 0 0 {name=R2
+W=0.35
+L=1.75
+model=res_xhigh_po
+spiceprefix=X
+mult=12}
+C {devices/lab_wire.sym} -240 -1170 0 0 {name=l1 sig_type=std_logic lab=vref}
+C {devices/lab_wire.sym} 40 -1170 0 1 {name=l2 sig_type=std_logic lab=vfb}
+C {devices/lab_wire.sym} 250 -1160 0 0 {name=l3 sig_type=std_logic lab=vfb}
+C {devices/lab_wire.sym} 140 -1220 0 1 {name=l4 sig_type=std_logic lab=c}
+C {devices/lab_wire.sym} 40 -1240 0 0 {name=l5 sig_type=std_logic lab=cc}
+C {devices/lab_wire.sym} 320 -1240 0 1 {name=l6 sig_type=std_logic lab=out}
+C {devices/lab_wire.sym} -270 -1120 0 0 {name=l7 sig_type=std_logic lab=iref}
+C {devices/vdd.sym} 50 -1330 0 0 {name=l8 lab=VDD}
+C {devices/gnd.sym} 20 -980 0 0 {name=l9 lab=GND}
diff --git a/netlists/ota.sch b/netlists/ota.sch
new file mode 100644
index 0000000..30bd9bd
--- /dev/null
+++ b/netlists/ota.sch
@@ -0,0 +1,126 @@
+v {xschem version=2.9.9 file_version=1.2 }
+G {}
+K {}
+V {}
+S {}
+E {}
+N -530 -850 -530 -810 { lab=imp}
+N -570 -850 -530 -850 { lab=imp}
+N -570 -850 -570 -840 { lab=imp}
+N -530 -810 -500 -810 { lab=imp}
+N -520 -890 -520 -840 { lab=#net1}
+N -520 -840 -460 -840 { lab=#net1}
+N -380 -890 -380 -840 { lab=#net1}
+N -460 -840 -380 -840 { lab=#net1}
+N -590 -920 -560 -920 { lab=inp}
+N -340 -920 -300 -920 { lab=inn}
+N -480 -1000 -420 -1000 { lab=#net2}
+N -520 -970 -520 -950 { lab=#net2}
+N -380 -970 -380 -950 { lab=out}
+N -520 -1090 -520 -1030 { lab=VDD}
+N -520 -1090 -450 -1090 { lab=VDD}
+N -450 -1090 -380 -1090 { lab=VDD}
+N -380 -1090 -380 -1030 { lab=VDD}
+N -460 -1000 -460 -960 { lab=#net2}
+N -520 -960 -460 -960 { lab=#net2}
+N -380 -960 -320 -960 { lab=out}
+N -570 -870 -570 -850 { lab=imp}
+N -570 -780 -570 -770 { lab=GND}
+N -570 -770 -460 -770 { lab=GND}
+N -460 -780 -460 -770 { lab=GND}
+C {sky130_fd_pr/nfet3_01v8.sym} -480 -810 0 0 {name=M1
+L=1
+W=30
+body=GND
+nf=6
+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/nfet3_01v8.sym} -550 -810 0 1 {name=M2
+L=1
+W=1
+body=GND
+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/nfet3_01v8.sym} -540 -920 0 0 {name=M3
+L=0.5
+W=16
+body=GND
+nf=4
+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/nfet3_01v8.sym} -360 -920 0 1 {name=M4
+L=0.5
+W=16
+body=GND
+nf=4
+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_wire.sym} -580 -920 0 0 {name=l1 sig_type=std_logic lab=inp}
+C {devices/lab_wire.sym} -320 -920 0 1 {name=l2 sig_type=std_logic lab=inn}
+C {sky130_fd_pr/pfet3_01v8.sym} -500 -1000 0 1 {name=M5
+L=0.5
+W=30
+body=VDD
+nf=6
+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/pfet3_01v8.sym} -400 -1000 0 0 {name=M6
+L=0.5
+W=30
+body=VDD
+nf=6
+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/vdd.sym} -450 -1090 0 0 {name=l3 lab=VDD}
+C {devices/lab_wire.sym} -330 -960 0 1 {name=l4 sig_type=std_logic lab=out}
+C {devices/lab_pin.sym} -570 -860 0 0 {name=l5 sig_type=std_logic lab=imp}
+C {devices/gnd.sym} -460 -770 0 0 {name=l6 lab=GND}
