how to perform a low pass filtering to a current signal

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bhl777

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Hi all, if we have a current mirror to generate a current source signal or sink signal, with repetitive rate frequency, such as sine wave, are we able to apply some low pass filtering circuit directly to this current, and generate a close to DC level current? Thank you!
 

I think it would be simpler to filter the mirror's common gate voltage.
 
Connect a big fat cap at the gates of the transistors to ground.
 
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