I am using the AD8302 and am baffed. I am expecting a stable voltage for the phase change, in a system that is supposedly stable from changes we are seeing a weird waveform when the output is digitized. I've attached an image of what we are seeing, there is a weird dip.With this particular test the system is stable with no expected phase change at all, however, if I'm interpreting the waveform correctly, the phase changes drastically approximately 12 times a second. Any insight as to why this is happening would be very much appreciated. Both input frequencies are 100kHz.