There is a pulse on Amplifier output,how to delete it?
Your schematic doesn't show decoupling capacitors anywhere..
Is the problem still persistant ?
You don't show any waveforms for your digital signals to the multiplexer. There may be a condition where the op amp
has no feedback monetarily.
You have not specified the function of your circuit. We may need more details to this.
The pulse can occur when the OP07 becomes open-loop (no feedback, very high gain), that is when the the inverting(-) input is connected to GND (via MUX) and no feedback at all, as Harry specified. Slight noise on non-inverting(+) input of op-amp results to saturated output. If your want to disable input (for any purpose), you can instead short the non-inverting input to ground and maintaining any gain on your feedback circuit.
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