Clock phase discriminator

Details Clock phase discriminator Clock phase discriminator

1986-02-24

1987-10-06

Wan, Gene

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, H03L 700

Patent

active

046986006

ABSTRACT:
A clock phase discriminator measures phase difference between a pair of digital clock signals to produce phase error signals used to adjust the frequency of one clock so as to reduce the phase difference. The discriminator includes a latch circuit that responds to successive transitions of the clock signals by undertaking a multistate phase measurement transition path in which only one state variable changes at a time. The latch circuit reduces the exposure of the phase discriminator to race conditions while measuring the phase difference and producing the error signals.

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"Disk-Separator IC Eases Encoding/Decoding Tasks", Herb Schneider, EDN Magazine, Aug. 1983.
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"CMOS Phase-Locked Loops", Solid State Scientific SCL4046B 883/4046B an SCL4446B 883/4446B, pp. 116-119.

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