Using 2-port parameters in simulation (possible?).

Hello all,

Is it possible to use Z (or Y, h, S etc..) parameters with a SPICE-based
simulator?. If so, is there any limitation on the kind of simulation that
can be done e.g transient, AC, PSS etc...?

Thanks

Jon

 

Couldn't you use controlled sources?

 

In spectre you have a component "nport" which allows s-parameters to be
specified to describe the response of a multi-port component.

This then works in all spectre analyses. Note, prior to IC5141 you had to use
the interpolation method "rational" (a parameter for nport) in order to simulate
using SpectreRF large signal analyses (pss, qpss, envlp). From IC5141 you can
use the standard "spline" or "linear" interpolation methods which are more
robust and more accurate (and are the same methods that are used in transient).

You do of course need to be careful about the quality of your s-parameter data,
since it is quite possible to describe things in the frequency domain which lead
to non-causal behaviour when translated into the time domain (for example,
you can have s-parameters which represent a constant phase shift at all
frequencies, or an ideal delay - both cause trouble when it is trying to find a
time domain representation of this, and can lead to instability during transient
simulations).

Regards,

Andrew.