Data tracking phase locked loop

Details Data tracking phase locked loop Data tracking phase locked loop

1979-09-24

1982-02-16

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 18, H03L 708

Patent

active

043161529

ABSTRACT:
A counter of modulus n counts the oscillations of a variable frequency oscillator whose center frequency is n-times the nominal frequency of digital data having phase variations. The occurrence of a selected value of the count may be taken as a phase corrected clock for the digital data. Differences between successive values in the counter as pulses of the digital data occur indicate shifts in phase thereof, while the modularity prevents absent data pulses from contributing to the phase error. Successive counts are captured, made available as phase error information in digital form, and used to drive a digital-to-analog converter whose output controls the variable frequency oscillator.

REFERENCES:
patent: 3271688 (1966-09-01), Gschwind et al.
patent: 4138650 (1979-02-01), Anderson
patent: 4151485 (1979-04-01), LaFratta

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