Frequency standard generator

Details Frequency standard generator Frequency standard generator

1998-08-18

2000-06-20

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 18, 331 1R, 375376, 455260, 327159, 327160, 327156, H03L 7085

Patent

active

060782242

ABSTRACT:
A frequency standard generator for generating a high accuracy reference frequency by synchronizing a high accuracy atomic frequency standard or equivalent thereof and minimizing a phase difference between the generated reference frequency and the received atomic frequency standard. The frequency standard generator includes a voltage controlled crystal oscillator (VCXO) for generating high stability output signal to be used as a standard frequency signal, a radio wave receiver which receives a radio wave and reproduces a time signal to be used as a reference for the VCXO, a time interval measuring circuit which measures a phase difference between the time signal and the output signal of the VCXO and generates data indicating the phase difference, a frequency control processor which produces control data to control the frequency of the VCXO such that the phase difference maintains a constant value through an operation of a phase lock loop, a phase controller which initiates a phase control operation for reducing the phase difference for a predetermined period of time, and a D/A converter which converts the received data to an analog voltage to be supplied to the VCXO.

REFERENCES:
patent: 5629649 (1997-05-01), Ujiie

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