Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Patent
1999-01-22
2000-06-27
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
331 3, 331 11, 331 14, 331 16, 331 17, 331 25, H03L 707, H03L 714
Patent
active
060811633
ABSTRACT:
A frequency standard generator includes a voltage controlled crystal oscillator (VCXO) for generating high stability output signal, a radio wave receiver to receive a radio wave which includes a high accuracy reference time signal, a time interval measuring circuit which measures a phase difference between the reference time signal and the output signal of the VCXO; a frequency control processor which determines control data based on the phase difference data to phase lock the output signal of the VCXO to the reference time signal, a frequency deviation data generator for compiling the phase difference data to obtain frequency deviation trend data of the VCXO, and a compensation data generator for generating compensation data based on the frequency deviation trend data to compensate frequency changes in said VCXO when the reference time signal is unavailable.
REFERENCES:
patent: 5629649 (1997-05-01), Ujiie
patent: 5870001 (1999-02-01), Osterling et al.
patent: 5940027 (1999-08-01), Forseth et al.
Maruo Kazuyuki
Ujiie Hitoshi
Advantest Corp.
Grimm Siegfried H.
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