What is really troubling me is that one of the integrators does not have a resistor across the feedback capacitor. I though that was needed because it is the real world and you cannot expect to have an ideal integrator. But for some reason this board uses a standard ideal configuration op amp integrator.

This integrator is suppose to provide a constant DC averaging of the input signal. I have searched the the internet but I am not sure how an op amp integrator is suppose to output the average DC value of the input. I understand the other operations of the integrator; such as waveform generation and AC signal integration (sin -> cos), but I do not understand this average voltage output. All I get is saturation.

Can someone explain to me how I get this output? Thank you in advance.

-Andrew