Spice Seminar Simulation Program with Integrated Circuit Emphasis

Spice Seminar Simulation Program with Integrated Circuit Emphasis

Generating a Netlist SPICE Netlist Text file used for simulation Schematic Entry (Common Data format: EDIF) Generate Netlist (SPICE Netlist Different flavors Quite similar) Simulate

Netlist Format C B E model name Q 1 Vo Vin 0 Q 2 N 2222 R 1 Vo Vcc 1 K V 1 Vin 0 V 2 Vcc 0

Number format m u n p f 10 -3 10 -6 10 -9 10 -12 10 -15 K Meg G Alternative Notation 1 e 3 Note 10 M is the same as 10 m! 103 106 109

Which is more readable/maintanable?

Examples of Types of Spice Simulations • Bias Point • DC Sweep • Transient Analysis • AC sweep/Noise • Secondary (nested) sweeps • Parametric • Temperature • Monte Carlo

DC sweep Result Vo Output as a function of Vin V 1

Parametric Sweep – creating a variable

Nested Sweep

Characterizing a MOSFET - specifying a Model file Primary Sweep and secondary sweep Vd secondary Vg D GSB M 1 Vd Vg 0 0 Mbreak. N V 1 Vg 0 V 2 Vd 0. model MBreak. N NMOS Vto = 1 V Kp = 2 m primary

Bias Point Simulation

Transient and AC Sweep Transient Results Time varying inputs (ex. Sinusoidal, digital clock) Output as a function of time t t AC Sweep Multiple sinusoidal inputs each with a different frequency Results Vo Output as a function of freq

Transient Sweep Vsin

Examples of Types of Spice Simulations • Bias Point • DC Sweep • Transient Analysis • AC sweep/Noise • Secondary (nested) sweeps • Parametric • Temperature • Monte Carlo