amplifierguru said:Yes kanwar, this is a reliable strategy with low impact on slewing rate and THD. I used this in my PA amp range of the '70's! The downside is that it bypasses the output stage so reduces loop NFB around this most distorting stage.
Read Dr Cherry, for ideas on differentiated loops.
darkfenriz said:one more possiility to stabilize:
in inverting mode- summing junction (resistor to resistor shunt) add the cap to the ground (dominant pole or pole-zero) so that the substracion is the slowest operation and keeps other stages free from saturation, TIM, ...
I see only pros...
amplifierguru said:Hi bscally,
I'll have to watch my phraseology in your presence. I meant that the loop gain was being redirected back to the input stage leaving less global NFB around the output stage for reduction of it's distortion. Same difference.