I'm trying to measure stability and reflection coef. for a three stage PA by looking in between each stage. I've used the SProbe file before for small signal amps but for the PA, I need data under large signal conditions. If I understand the SProbe properly, it computes data under small signal conditions only. I've also used ideal couplers inserted between stages but I'm leery of the results. Can anyone help me with this?
You could try a LSSP (Large Signal S-Parameter) simulation but not having tried it myself it may be necessary to modify the SProbe to work properly. What also clouds the situation is that there are two version of the SProbe so it will also depend on what "version" you are using.
Please contact EEsof Technical Support in case you still are having problems and/or concerns.
http://eesof.tm.agilent.com/support/supp101.html