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Unwrapping phase response
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on Mar 10, 2004
on Mar 16, 2004 by ROB_LEFEBVRE
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Is there a way to unwrap the phase response of a circuit/data file? The application is a SAW filter with single ended input and balanced outputs. I'd like to check the phase difference between the two paths.
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Mar 16, 2004 9:40 AM
If the phase is somewhat linear for each device, then a technique I use is to put a negative length 50 ohm transmission line at the output. You can tune the length manually to unwrap the phase, or you can optimize the length so that the phase is approximately zero at all frequencies. If you do that, the data should be much easier to work with.
I agree, an unwrap phase function could be very useful, too. Hopefully, in the next major revision, this will be trivial to implement in a user function. For now, I don't think it would be easy to do it directly.
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