PMOS Common Source Simulation in SPICE

Feb 05, 2026

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This exercise involves repeating the simulation programs from Lesson 1 with a focus on a PMOS common source circuit. The goal is to analyze the PMOS I-V characteristics using the provided SPICE syntax, including defining parameters, setting voltage sources, and sweeping gate voltage values. Users will write a SPICE simulation to produce the desired output curves, similar to how NMOS circuits are analyzed. Understanding PMOS behavior and using simulation software effectively is critical for circuit design and analysis.

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PMOS Common Source Simulation in SPICE

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Exercise 1
1. Repeat the simulation programs of Lesson 1. • 2. Perform the same simulation programs of Lesson 1, except the circuit is a PMOS common source ckt. An example is given below.
PMOS I-V Curve .protect .lib 'c:\mm0355v.l' TT .unprotect .op .options nomod post VDD 1 0 3.3v R1 3 0 5k Rsd 1 1_1 0k V3 3 0 0v .param W2=5u M1 3 2 1_1 1_1 +pch L=0.35u W='W2' m=1 +AD='0.95u*W2' PD='2*(0.95u+W2)' +AS='0.95u*W2' PS='2*(0.95u+W2)' VG 2 0 0v .DC V3 0 3.3v 0.1v SWEEP VG 0.1v 3v 0.25v .PROBE I(R1) I(Rsd) .end