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Subsections

Conditionals

ACS behavioral modeling conditionals are an extension of the ``AC'' and ``DC'' Spice source parameters.

The extensions ...

  1. There are more choices, including an ``else''.

  2. They apply to all elements (primitive components).

  3. Each section can contain functions and options.

They are interpreted as an if, else-if, else statement. The first condition that is true applies.

The following are available:

AC
AC analysis only.
DC
DC/OP/Transient/Fourier analysis only
DCOP
DC/OP analysis only.
DCONLY
DC analysis only.
DCTRAN
DC/OP/Transient/Fourier analysis only (same as DC)
OP
OP analysis only.
TRAN
Transient/Fourier analysis only.
ELSE
Anything not listed.

Examples

V12 1 0 AC 1 DC 3
This voltage source has a value of 1 for AC analysis, 3 for DC, OP, Transient, and Fourier analysis.

R44 2 3 OP 1 ELSE 1g
This resistor has a value of 1 ohm for the ``OP'' analysis, 1 gig-ohm for anything else. This might be useful as the feedback resistor on an op-amp. Set it to 1 ohm to set the operating point, then 1 gig to measure its open loop characteristics, hiding the fact that the op-amp would probably saturate if it was really left open loop.


next up previous contents
Next: Functions Up: Behavioral modeling Previous: Behavioral modeling   Contents
Al Davis 2000-06-03