1. Spice Enrico Santi

2. Types of Analysis Bias point (always performed).TRANtransient analysis.ACAC analysis (on linearized system).FOURFourier analysis.DCDC sweep analysis

3. File Types Input.CIRtext file with circuit description Output.OUTSpice text output (contains error messages and bias point info).DATData file (used by Probe to plot)

4. Format of.CIR Files Title Circuit description Analysis description Output description (.PROBE) End-of-file statement (.END)

5. Part Library Part library contains collection of subcircuits representing OPAMPS, IC chips, etc. Parts can be used to build circuits (node mapping)

6. Part Library and Subcircuit Syntax.LIB eval.lib * include library eval.lib X  name  [  nodes  ] SUBNAME * call statement File eval.lib contains subcircuits:.SUBCKT SUBNAME [  nodes  ]  circuit description .ENDS SUBNAME

7. Defining Model Parameters: the.MODEL statement Used to define model parameters Syntax for an NPN transistor with forward beta of 300 Q1 1 2 3 QNAME.MODEL QNAME NPN (BF = 300)

8. Examples RC circuit (time domain and frequency domain) Astable circuit using 555 (use of library and subcircuits) Transistor current source (use of.MODEL statement to define component parameters)

9. Example: Highpass Filter RC highpass filter VG 1 0 DC 10V AC 1 R1 2 0 159K C1 1 2 10NF IC=-5V.TRAN 6us 6MS.AC DEC 100 1HZ 10KHZ.PROBE.END

10. 555 Astable