PLL including static phase error responsive oscillator control

Details PLL including static phase error responsive oscillator control PLL including static phase error responsive oscillator control

1991-04-09

1992-06-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 20, 331 25, 358158, H03L 7085

Patent

active

051210860

ABSTRACT:
A static phase error responsive oscillator control includes a phase detector coupled to a source of horizontal synchronizing pulses, a low pass filter, an error amplifier, a voltage controlled oscillator having a frequency equal to a multiple of the horizontal scan frequency, and a corresponding frequency divider. A threshold detector responds to error signals in excess of predetermined upper and lower thresholds to indicate large magnitude frequency corrections. An averaging circuit determines the long term character of the large magnitude corrections to alter the free-running or static frequency of the oscillator. Once the free-running frequency is corrected, static phase error is substantially reduced or eliminated.

REFERENCES:
patent: 4107623 (1978-08-01), Graf et al.

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