Hello, guys. Here's the situation. I have a non-inverting op amp which acts as an input buffer and then, next in the signal path i have an inverting op amp. Do I need to place a capacitor at the input of the inverting op amp, in series with the non-inverting one? (I already have one input cap at the input of the buffer, so further DC-blockage won't be needed)
The problem is DC offset at the output > Vos x gain. If you use good OPAMP design practice and assuming low gains. It doesn't help placing the series capacitor at the input of the last stage. The better solution is to place the DC block capacitor at the output of the last stage along with a series current limit resistor.
We could use a servo ckt to fix the offset. r did not indicate that a +/- or unipolar PS is used. Schematic....a pix = 1k words. E
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