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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Try explaining what happens posted by Commuteman on January 14, 2004 at 14:21:07:
Peter and SE, I think that I understand what you are debating about, but here is my input. ALL feedback correction comes from overdriving the input stage to correct ANY deviation from the original input signal. This means that the output impedance with feedback is derived from the feedback itself, UNLESS the open loop output impedance is very low. Matti Otala wrote a paper on this in the late '70's. If you have to correct too much extra output contribution, then you get IIM distortion. If the amp responds too slowly, you get TIM distortion.
Interestingly, the complementary feedback pair has the lowest IIM distortion, all else being equal.
Any signal with significant components above the open loop bandwidth should attempt to overdrive the input stage, and be problematic.
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Follow Ups
- Re: Try explaining what happens - john curl 15:06:32 01/14/04 (0)
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