[sdiy] Analog bandwidth

[Richard Wentk]

Possibly one of those annoying general questions. ;)

Has anyone actually measured the true signal bandwidth at the output of an analog synthesizer? Any make or model would do. 

Obviously in theory there's no need to have much happening above 20k. But I'm wondering how true that is in real circuits. 

Motivation is to consider how much bandwidth DSP systems need to do a good simulation. 

44.1k is clearly a very poor representation of the real thing. But I'm wondering how high you really need to go, and how careful you have to be about modelling features like limited opamp gain bandwidth product and possible single pole phase shifts (etc). 

If there are real differences the usual abstract models of (say) a four-pole filter aren't going to be all that close to the imperfections of the real thing.

Richard