Frequency standard generator synchronized with satellite or othe

Details Frequency standard generator synchronized with satellite or othe Frequency standard generator synchronized with satellite or othe

1995-11-22

1997-05-13

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 18, 331 25, 331 44, 331 66, 331 69, 331158, 375376, 455260, 455 511, 327156, H03L 7085

Patent

active

056296495

ABSTRACT:
A frequency standard generator includes a voltage controlled crystal oscillator for generating high stability output signal to be used as a standard frequency signal, a satellite wave receiver which receives a radio wave from a satellite which includes a highly accurate satellite time signal and reproduces the satellite time signal to be used as a reference for the voltage controlled crystal oscillator, a frequency divider which divides the output signal of the voltage controlled crystal oscillator by a dividing ratio arranged to generate a crystal time signal which is identical in frequency to the satellite time signal, a time interval measuring circuit which measures a time interval which is a phase difference between the satellite time signal and the crystal time signal and generates a digital signal indicating the phase difference, a frequency control processor which arithmetically determines control data based on the digital signal from the time interval measuring circuit such that the phase difference maintains a constant value through an operation of a phase lock loop, and a D/A converter which converts the control data from the frequency control processor to an analog voltage which is used to control the output frequency of the voltage controlled crystal oscillator.

REFERENCES:
patent: 4899117 (1990-02-01), Vig
patent: 5203030 (1993-04-01), Kawasaki
patent: 5311149 (1994-05-01), Wagner et al.
patent: 5363112 (1994-11-01), Hatcher
patent: 5392005 (1995-02-01), Bortolini et al.
patent: 5477195 (1995-12-01), Spilker
patent: 5483201 (1996-01-01), Bortolini

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