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Re: transient test - Part II

"Any time you put a feedback loop within another loop, such as when you are making a complete amplifier, then even more complex distortion will be predictable...."

Theoretically the complexity of distortion is complete as soon as a fraction of feedback is applied. This is because the loop keeps looping harmonics as they arise, and the harmonics keep intermodulating at the input.

I see no problem with linearizing each stage by feedback (at the very least getting it over its multiplication hump), and then inserting these stages within an overall loop. The overall loop then sees relatively linear stages, i.e., the loop has less harmonic content to multiply. The problem here is likely to be stability more than distortion.

"This usually leads to adding compensation, and thereby slowing the gain bandwidth of the total circuit below that of a simple follower."

The Hawksford cascode apparently gets around this. If so, it makes a good candidate for further simulations. I would like to see this placed in cascade with a gain stage with overall feedback.

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