Phase Compansation Circuit

Status
Not open for further replies.
S

strahd_von_zarovich

Advanced Member level 4
Joined
Sep 25, 2015
Messages
118
Helped
1
Reputation
2
Reaction score
3
Trophy points
1,298
Activity points
2,463
Hi, I have a system which two signals must have 90 degree phase difference . I am measuring their phase difference using mixer(both signals at the same frequency and other harmonics are filtered). I have a phase shifter to adjust phase of one of them. Phase shifter is voltage controlled. My question is what kind of circuit can be used to minimize voltage output of the mixer. Some kind of opamp integrator circuit in a closed loop maybe ? :thinker:

Since i can't know which signal is lagging or leading, sometimes i must shift phase further, right ? :thinker:
 

A PI error amplifier would be my first guess.

You didn't tell about the phase shifter range. Generally, an additional comparator for positive or negative phase difference and phase reversal switch are required to push the phase difference to the right part of the detector curve.
 
Thanks for reply. Phase shifter range is 0-600 Degree for 0V - +5V analog voltage. (120 deg/volt). I didn't understand how can we know which signal is leading using comparator after mixer output . I will study some PI error amplifiers. :-D Looks like thats what i need.
 

I didn't understand how can we know which signal is leading using comparator after mixer output.
Click to expand...
That's not possible. You need to check the phase relation of the input signals, e.g. with a DFF.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…