circuit for extracting signal average

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Debdut

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Is there any way to extract the average value of a voltage waveform without using a low-pass filter? The signal is of high frequency.
I don't want to use a filter, as the the average I am trying to extract will go to an op-amp. So there will be stability issues if there is a large pole in the op-amp path.
 

"go to an op-amp" and being "in the op-amp path" are different things. Rather mysterious how a low-pass in front of an amplifier should affect stability. May be you are not telling the full story?

Averaging can be a achieved by low-passes or integrators, ín other words poles at low frequency or zero. Quite obvious, I think.
 

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