A Kumar R
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Posts: 72
India
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Hi Ken,
Thanks for the reply.
it is impossible to explain the operation w/o assuming a parasitic cap at the -ve i/p of the amp. other parasitics do exist, but w/o this parasitic the circuit doesn't work i believe.
after giving some thought, i kind of getting at the following.
if we assume some parasitic at that -ve i/p of the amp....we have a current path. but, since this node is the amp input and if any charge lost at that node the amp tries to correct the output towards that new VIN voltage, and it does so as long as the lost charge is put back (or taken out depending on the direction of VIN w.r.t VCM level) at that node. of course, it depends on the gain A, and the new voltage would be VCM +/- (VCM-VIN)/A.
Thanks, A Kumar K
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