Digital phase detector and method

Details Digital phase detector and method Digital phase detector and method

G - Physics

01

R

324/33, 343/85

G01R 25/00 (2006.01) G01R 25/08 (2006.01) G01S 1/30 (2006.01) G06J 1/00 (2006.01)

Patent

CA 1130382

DIGITAL PHASE DETECTOR AND METHOD ABSTRACT OF THE DISCLOSURE A digital phase detector includes a hard limiter which transforms an incoming signal of known-frequency into a binary signal at the same frequency. A reference generator produces two binary references at the signal frequency, one reference shifted 90° in phase with respect to the other. The binary signal is exclusive-ORed with each reference and the exclusive-OR outputs therefrom control two counters, the counters thereby registering counts analogous to trigono- metric functions of the signal phase angle. A phase modulated clock drives the counters, the phase modulation feature per- mitting a correction factor to be incorporated in order to cancel the error introduced by the quantized nature of the digital computations involved.

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