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| .lib "../../skywater_pdk/sky130_fd_pr/models/sky130.lib.spice" tt |
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| * 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 dc 0 |
| |
| |
| .noise v(out2) v3 dec 101 1 1g |
| |
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| * ngspice control statements |
| .control |
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| run |
| *Please run the following commands in the ngspice window for obtaining the plot |
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| *setplot - to see all plots available |
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| *select the plot which has "Noise Spectral Density Curves" |
| *setplot noise1 |
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| *plot inoise_spectrum |
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| .endc |
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| .end |
