Use double balanced mixer as phase detector ?

[khungbopro]

Hi all,
Have you ever use Double Balanced Mixer as Phase Detector (full 360 degree) ?
Theoretically, LO and RF signal have identical frequency, and the output at the IF is DC signal.
But I'm not sure it can be distinguished positive and negative phase differential between 2 signal at LO and RF port based on IF output signal :roll:

I've referenced in 2 documents:
1. wj using mixer as phase detector
2. ADE_Mixer_As_Phase_Detector.htm

Can you help me solve this problem :?:
Thanks in advance!

 

[chuckey]

If you regard one waveform as sampling the other, depending on the relative phases, you can get Vmax X .8 values at two different phase differences. its is best if the signals are in quadrature, this gives you a linear - 90 degs to +90 degs output. You will also need a non-ambiguous detector, to over come the two phases for one DC output.
Frank

 

[khungbopro]

I want to use phase detector for wide band (~30 MHz bandwidth in HF).
Could you guide me to design a "non-ambiguous detector" to distinguished positive and negative phase differential !?
Thanks!

 

[biff44]

**broken link removed**

there are analog ramp based phase detecors.

There are digital flip-flop based phase detectors 720 degrees operation