If I will build this circuit in real life, I will probably see a mV noise with the scope due to high cascaded gain and probably some oscillations.
I use LPC358 which is specified to (Input-referred voltage noise) 178nV/SQRT(HZ). I am trying to figure out how small can be the input signal (now is GND at C3) to be masked by noise generated by circuit itself.
My simulation is clearly wrong, showing a clean output with some nV flicker.
How can I add some noise in LTSpice, based on the fact that any opamp has specified noise, that will emulate real worlds noisy output so I can select from several opamps, gain, etc?