Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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Re: Linear Stages

Posted by Scott Frankland on August 3, 2003 at 14:54:08:
"1) How linear does the stage have to be in order to "safely" apply feedback?"
As a start we need to ensure that the feedback reduces all harmonics below the level of the open-loop amplifier. If this does not occur, then the device is too nonlinear, or there is not enough feedback.
"2) If the stage is linear enough to safely apply feedback, is feedback even then necessary (or beneficial)?"
Let me answer that with another question: Which devices and circuits are linear enough to not need feedback of some kind? The beauty of this question is that the answers apply to feedback as well as nonfeedback amplifiers. So both approaches are linked in this way, and both can be pursued in parallel.
"Sure, those numbers would be even "better" if we were to apply feedback, but I'm not sure there would be any point."
You said it yourself: you're not sure. Neither am I. There's only one way to find out, and that is to become an expert in feedback. But this is a long road, which may or may not be a dead end. According to jc, that's what it is, and he certainly qualifies as an expert. BUT, I remain curious, and I don't like watching TV.