RE: Modeling - Fast Tr

Brian C. Wadell ([email protected])
Thu, 5 Sep 1996 22:48:17 -0400


FYI, s-parameters are often used for nonlinear devices by specifying an =
operating point. The s-parameters are taken at various operating points =
and the actual operating point is interpolated among the available data. =
For example, for a transistor you might take s-parameters for different =
collector currents.

This is not a valid technique for strong nonlinearities but is very =
useful in many practical cases.

Nonlinear s-parameters do exist. They are called VIOMAP. Basically a =
Volterra series version of linear s-parameters.


Brian C. Wadell
Guided Wave Solutions

range and convert these into useful models that are ideal to use in a =
non linear
simulator such as Spice. And....S parameters DO CONTAIN INFORMATION =
measurement instruments can measure n-ports. S parameters cannot be =
applied to the
digital switching transistors because of their non-linearities.=20

Best Regards,

Fred Balistreri