Digital phase comparator and phase-locked loop

Details Digital phase comparator and phase-locked loop Digital phase comparator and phase-locked loop

H - Electricity

03

L

H03L 7/18 (2006.01) G01R 25/08 (2006.01) H03D 13/00 (2006.01) H03L 7/089 (2006.01)

Patent

CA 2105233

A digital phase comparator measures the phase difference of two signals (S1, S3) from a third signal (S2), and calculates the difference. The zero crossing of the two signals respectively sets two flip-flops (11, 12). If both flip- flops are set, they are simultaneously reset with a delay. Each set flip-flop enables a corresponding counter (13, 14). An evaluation unit averages the counter outputs at major intervals. The phase comparator can be incorporated into a phase- locked loop.

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