Help with a pre-amp

Originally posted by Graham Slee Even a slight improvement in open-loop bandwidth results in a better sound - just ask our customers (yourself?).

I agree! This is pure math and quite easy to understand... and it's incredible to think that other makers don't give the right amount of attention to it.

Higher open loop bandwidth and gain = higher crossover frequency = higher phase margin when feedback is applied = less residual distortion at high frequencies of the hearing range


Sure, one can design a compensating network so that even if the open loop gain/bandwidth is not large, the closed loop amplitude response will be reasonably flat and extended in bandwidth. But whenever one takes a look at the phase plot too... the shock! The horror!


Edited by Lucabeer - 17 Mar 2010 at 9:05am