| |
| .lib "../../skywater_pdk/sky130_fd_pr/models/sky130.lib.spice" tt |
| |
| * Stage 1 - Differential amplifier |
| xm1 net-_m1-pad1_ in1 net-_m1-pad3_ net-_m1-pad3_ sky130_fd_pr__nfet_01v8 l=1 w=1.79 |
| xm2 out1 in2 net-_m1-pad3_ net-_m1-pad3_ sky130_fd_pr__nfet_01v8 l=1 w=1.79 |
| xm3 net-_m1-pad1_ net-_m1-pad1_ vdd vdd sky130_fd_pr__pfet_01v8 l=1 w=10 |
| xm4 out1 net-_m1-pad1_ vdd vdd sky130_fd_pr__pfet_01v8 l=1 w=10 |
| |
| * Current Mirror |
| xm5 net-_m1-pad3_ ref vss vss sky130_fd_pr__nfet_01v8 l=1 w=20 |
| xm6 ref ref vss vss sky130_fd_pr__nfet_01v8 l=1 w=10 |
| |
| * Stage 2 - PMOS Common Source Amplifier |
| xm7 out2 out1 vdd vdd sky130_fd_pr__pfet_01v8 l=1 w=62.83 |
| xm8 out2 ref vss vss sky130_fd_pr__nfet_01v8 l=1 w=62.83 |
| |
| |
| * Circuit Bias |
| v1 vdd gnd dc 1 |
| v2 vss gnd dc -1 |
| xR1 vdd ref gnd sky130_fd_pr__res_high_po_0p69 l=100 |
| |
| |
| v3 in1 gnd ac 1 |
| v4 in2 gnd ac 1 |
| |
| *Simulation Command |
| .ac dec 101 1 1g |
| |
| * ngspice control statements |
| .control |
| run |
| print allv > plot_data_v.txt |
| print alli > plot_data_i.txt |
| |
| plot db(V(out2)/V(in1)) |
| |
| let gain = db(V(out2)/V(in1)) |
| let max_gain = maximum(gain) |
| |
| print max_gain |
| |
| .endc |
| .end |
