PLL prototype test board in

A project log for Photo-acoustic Spectroscopy

Creating an at home photo-acoustic spectroscopy system

JasMoHJasMoH 12/26/2017 at 22:320 Comments

Prototype board and top solder stencil for PLL. The design goals are 

support ~1Hz - 100kHz input frequency

"arbitrary" waveform that is between +-5V and crosses its midpoint twice per cycle.

outputs 64x the input frequency for the ADA2200 demodulator

phase shifts output to allow manual phase adjustment.

I'll be populating and testing this out in the next few days. I may decide to OBE the phase shifter in favor of just having 2x ADA2200, and support I and Q demodulation and digital phase shifting.