How to perform AC sweep for lock in detector with OrCAD 9.2?

[apenevm]

Hello,

I am trying to perform AC sweep for lock in detector which is in the attachment with OrCAD 9.2. Both reference and input signal are sinusoidal. Reference signal (V2), fixed frequency 100 Hz is connected to non inverting input of operational amplifier OPA602. Input signal (V6) is sinusoidal and connected to analog switches. I need frequency variation from 10 Hz to 10 kHz for input signal.
I set AC Sweep and corresponding values for Start Frequency, End Frequency and Points per decade but I don't know what kind of voltage sources have to be used (VSIN, VSTIM or VAC). How should I set AC sweep only for input signal? Could you please give me an advice? Thanks in advance.

Regards,

 

[FvM]

It's a non-linear circuit that can be only simulated in transient analysis. You need to use a time domain input source, e.g.VSIN.