Harmonic Balance simulators and Spice models??

[billcalley]

In looking at MWO and ADS, it seems to me that most of the nonlinear
transistor models in their libraries are simply Spice models (either as
..model or .subckt files). Is this pretty much all harmonic balance
simulators use; or are there actually some true HB transistor models
out there?

Thank You,

Bill

 

[billcalley]

Yet I always hear how inaccurate Spice models are at microwave
frequencies; so I guess I just assumed there were actually HB models
out there so as to more accurately take into account all of the high
frequency effects of an active device...

Cheers,

Bill