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RE: Aargh!!! This is going off the page to the right!!! :-)

Thanks, I'd very much like to play with that software. Where can I get it?

The SS amps have the characteristic you mention due to limited gain-bandwidth product (GBW). That decreases the loop gain at higher frequencies so the distortion and output impedance rise. Depending upon how they are implemented there may be a single dominant pole which would be relatively easy to model. The rub is that the overall GBW is rarely sufficient, especially in power amps, to completely cover the multitude of sins that can occur in the underlying circuitry. And some of those sins are only invoked dynamically and thus will not show up well on a sweep.

You might consider a more complete model. I think LTspice will accept WAV files as a PWL (piece-wise linear) input so you could potentially run music through it. I don't know if there are any absolute limits on file size, but I doubt it. I also don't know how thorough their models are for the linear parts and whether they pick up stuff like die heating. I've only used the SW for switchers and they've focused lots of attention on getting those good enough to be useful.

Regards, Rick

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