Thank you Ken and RobG for your replies and testing out the circuit. It is interesting to know that the circuit broke into oscillations despite having a DC negative feedback (which I thought was the reason for circuit to be unstable) when yanked up. Wondering if is due to circuit being inherently unstable or due to large settling time constants. (This behavior is quite common for capacitively coupled biopotential amplifiers with pseudo resistor feedback. It would take a long time to recover from saturation event).
Also I have not thought about the case of reducing Cf which as RoBG mentioned results in oscillations. Interesting and I need to reason out why.
Ken, in reality an off switch has finite off state resistance and should that not keep the feedback loop closed? Probably the settling is bad, but if clock rates are extremely low, will this be a viable circuit?
buddypoor wrote on Apr 12th, 2016, 7:34am:ULPAnalog wrote on Apr 11th, 2016, 11:17am: I have seen some who tend to replace resistors everywhere with SC equivalents and claim correct operation.
Yes - that`s correct.
Back to this original question, does it mean, atleast in this particular example, replacing the feedback resistor with a SC equivalent makes no sense?