Hi there, I'd appreciate some comments on the following....
I want to compare the phase of two signals of the same frequency, frequency = 3 mhz.
Let's say I use a flip flop (HC series). Signal A is applied to the set input. Signal B is applied to the reset input. Then I low pass filter the FF output and hopefully get a voltage proportional to phase difference ?
What sort of resolution can I expect ? Does the output voltage vary linearly with phase ? Assuming the supply is 5v, it follows that measuring voltage down to 1 mv volt would measure phase with a 1/5000 resolution ?
If signal A sets the FF and 3 ns after that event signal B resets it can I expect the FF to produce a 3 ns pulse ? Or is there a minimum phase difference needed for the thing to give a meaningful result ?
If I had a scope I would built the circuit and just measure it, but since I don't I can only measure things using indirect means and the test wouldn't be very conclusive.
Thanks in advance !!