I would like to use a two-phase lock-in amplifier to find the magnitude and phase of a signal using a reference signal and a 90 degree phase shifted signal (full description on the lock-in wiki page).
If I use the AD630 to demodulate the signal I'm not sure what the inputs into pin 9 and 10 should be on the second de-modulator (de-modulator with the out of phase signal). I think the 90 degrees out of phase signal goes to pin 9, and pin 10 is tied to ground.
The lock in amplifiers have AD8429's before the de-modulator and a low pass filter after. The schematic for the de-modulator is attached.
Is this right? Will this pin arrangement give me a two-phase lock-in amplifier?
Out of interest are there any other analog IC's that can achieve the same thing?