Master timing generator

Details Master timing generator Master timing generator

1978-04-26

1979-01-16

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 17, H03B 304

Patent

active

041351665

ABSTRACT:
A master timing generator capable of tracking an externally generated clock signal and of maintaining desired operation during periods of disruption or perturbation of the clock signal by noise or other high-energy disturbances. The master timing generator includes a voltage controlled oscillator controlled by an input dc control voltage to produce an output signal which is maintained in a particular phase relationship with the clock signal by phase lock loop circuitry coupled to the oscillator. A dc standby voltage signal representative of the value of the control voltage applied to the oscillator is retained during operation of the master timing generator in a standby unit which, in the absence of noise affecting the clock signal, is electrically uncoupled from the oscillator. When the clock signal is affected by noise, an alarm signal representative of this condition is applied to the master timing generator and causes the phase lock loop circuitry to be electrically disengaged from the oscillator and the dc standby voltage signal retained in the standby unit to be switched to the input of the oscillator. This standby voltage signal is employed by the oscillator to produce its desired output signal for so long as the clock signal is affected by noise and the alarm signal representative of this condition is applied to the master timing generator. Upon termination of the alarm signal, the master timing generator returns to its normal mode of operation.

REFERENCES:
patent: 3869674 (1975-03-01), Borbely
patent: 3882412 (1975-05-01), Apple, Jr.

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