1. Spice Seminar
Simulation Program with Integrated Circuit Emphasis

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

3. Netlist Format C B E model name Q1 Vo Vin 0 Q2N2222 R1 Vo Vcc 1K
V1 Vin 0
V2 Vcc 0

4. Number format m 10-3 u 10-6 n 10-9 p 10-12 f 10-15 K 103 Meg 106 G 109
Alternative Notation 1e3
Note 10M is the same as 10m!

5. Which is more readable/maintanable?

6. Examples of Types of Spice Simulations
Bias Point
DC Sweep
Transient Analysis
AC sweep/Noise
Secondary (nested) sweeps
Parametric
Temperature
Monte Carlo
You may find this tutorial helpful at the end of the term

7. DC sweep
Result
Output as a function of Vin Vo V1

8. Parametric Sweep – creating a variable

9. Nested Sweep

10. Bias Point Simulation
In a bias point simulation capacitors are modeled as open circuits

11. Both transient and AC sweeps can be used to determine gains, input and output impedances

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

13. AC Sweep Configuration for Determining Voltage Gain (Av) and Input Impedance (Ri)
DC offset is zero
“small signal” is 1
Important: when simulating the start frequency cannot be zero!

14. Resulting Simulation

15. Plotting Av and Ri

16. AC Sweep Configuration for Determining Output Impedance (Ro)
DC offset is zero
“small signal” is applied here (Vo)
DC offset is zero
“small signal” is zero (Vin = 0)

17. Transient Sweep
Vsin