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Altera_Forum's avatar
Altera_Forum
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15 years ago

phase difference 2 signals.

is possible whit fpga FFT or similar metod measure a phase difference from 2 PULSED-sinusoidals signals? the freq of signals is 60MHz but the duration of signals is 0.5uSEC, and the PRF of pu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

That is difficult to judge unless you model you case.

Demodulation as FvM mentioned imply (as I believe sin at 0,1,0,-1 and cos at 1,0,-1,0) i.e. multiplying by 60 MHz and thus you get your frequency moved to zero(60 - 60) with an image at 120 (60 + 60) and this will need filtering I believe.

If you multiply by +1/-1 sine instead then you get your frequency at 60MHz with image folding on your frequency and no need for filtering But you can't generate sin/cos at +1/-1.