Digital phase detector and method

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324 83D, 328133, 328155, G06F 1520, H03D 1300

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active

041786319

ABSTRACT:
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.degree. 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 trigonometric functions of the signal phase angle. A phase modulated clock drives the counters, the phase modulation feature permitting 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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