I don't know what op-amps have against me, but they don't like me. Yesterday, I wanted to amplify an AC signal coming from a photodiode using a non-inversing configuration mode. I had a lot of noize, so I wanted to inverse it twice.
My problem is the following: When I measure the voltage across D1, it gives me 230mV. The output of my op-amp is a non-inverted signal with an amplitude of 15mV.
NB: It is not high frequency ,the board, the op-amp, the voltage source, the oscilloscope, the resistors, the wires, everything has been changed; it is not failure related. Thank you!
Shouldn't the op-amp try to compensate to bring the fake ground to a 0V, so output a negative signal? (at the very least)... I expected a 2V over inverted PWM signal...