Digital phase-locked loop with random walk filter

Details Digital phase-locked loop with random walk filter Digital phase-locked loop with random walk filter

1987-07-02

1988-12-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, 328155, H03L 708

Patent

active

047913860

ABSTRACT:
A digital phase-locked loop in which the lead or lag of the phase of the input is compared to the phase of the output of the loop and the occurrences of the advance or retardation are filtered in a random walk filter in order to phase control the output. According to the invention, the time trend of the advance or retardation is determined. If there is a significant run of either advance or retardation, the random walk filter is adjusted so as to more quickly provide correcting output.

REFERENCES:
patent: 4574243 (1986-03-01), Levine
patent: 4577163 (1986-03-01), Culp

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