* NGSPICE file created from diff-amp.ext - technology: sky130A

* Include SkyWater sky130 device models
.include "/home/mhasan13/pdk/skywater-pdk/libraries/sky130_fd_pr/latest/models/r+c/res_typical__cap_typical__lin.spice"
.include "/home/mhasan13/pdk/skywater-pdk/libraries/sky130_fd_pr/latest/models/r+c/res_typical__cap_typical.spice"
.include "/home/mhasan13/pdk/skywater-pdk/libraries/sky130_fd_pr/latest/models/corners/tt.spice"

* Vdd vdd gnd DC 0.7
* Vgnd vss gnd DC 0.0
* Ibias vdd i_bias DC 1n
* Vref in_2 vout DC 0.0
* Vin in_1 gnd DC 0.2 

Vdd vdd gnd DC 0.7
Vgnd vss gnd DC 0.0
Ibias vdd i_bias DC 1n
Vshort in_2 vout DC 0.0
Vin in_1 gnd DC PULSE(0 0.7 100p 1u 1u 10u 20u)

.subckt sky130_fd_pr__pfet_01v8_hymyl3 VSUBS a_n50_n112# a_50_n86# w_n144_n148# a_n108_n86#
X0 a_50_n86# a_n50_n112# a_n108_n86# w_n144_n148# sky130_fd_pr__pfet_01v8 w=500000u l=500000u
.ends

.subckt sky130_fd_pr__nfet_01v8_2qpbu2 VSUBS a_n108_n131# a_n50_n157# a_50_n131#
X0 a_50_n131# a_n50_n157# a_n108_n131# VSUBS sky130_fd_pr__nfet_01v8 w=1e+06u l=500000u
.ends

.subckt sky130_fd_pr__nfet_01v8_hhwku0 VSUBS a_n50_n107# a_50_n81# a_n108_n81#
X0 a_50_n81# a_n50_n107# a_n108_n81# VSUBS sky130_fd_pr__nfet_01v8 w=500000u l=500000u
.ends

.subckt diff-amp in_1 in_2 i_bias vdd vss vout
Xsky130_fd_pr__pfet_01v8_hymyl3_0 vss li_92_184# li_92_184# vdd vdd sky130_fd_pr__pfet_01v8_hymyl3
Xsky130_fd_pr__pfet_01v8_hymyl3_1 vss li_92_184# vdd vdd vout sky130_fd_pr__pfet_01v8_hymyl3
Xsky130_fd_pr__nfet_01v8_2qpbu2_0 vss vss i_bias li_176_12# sky130_fd_pr__nfet_01v8_2qpbu2
Xsky130_fd_pr__nfet_01v8_2qpbu2_1 vss i_bias i_bias vss sky130_fd_pr__nfet_01v8_2qpbu2
Xsky130_fd_pr__nfet_01v8_hhwku0_0 vss in_1 li_92_184# li_176_12# sky130_fd_pr__nfet_01v8_hhwku0
Xsky130_fd_pr__nfet_01v8_hhwku0_1 vss in_2 li_176_12# vout sky130_fd_pr__nfet_01v8_hhwku0
.ends


*instantiate
Xdiff in_1 in_2 i_bias vdd vss vout diff-amp

.control
* dc Vin 0 0.7 0.01
* plot v(in_2) v(in_1) v(vout)

tran 100n 50u
plot v(in_1) v(vout)
.endc
.end