Multifrequency control from a single crystal

Details Multifrequency control from a single crystal Multifrequency control from a single crystal

1979-02-01

1980-10-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 4, 331 19, 331 25, 331 69, 331158, 331183, H03L 702

Patent

active

042271584

ABSTRACT:
A piezo-electric crystal vibrating in several modes controls several frequencies generated by voltage controlled oscillators simultaneously. The output of each voltage controlled oscillator is fed to a summing amplifier which drives the crystal. The output of the crystal is fed to individual phase detectors; each phase detector is also supplied with the output of a voltage controlled oscillator and generates a voltage proportional to the phase difference between the voltage controlled oscillator and the crystal output for correcting the output frequency of each oscillator.

REFERENCES:
patent: 2478330 (1949-08-01), Shonnard
patent: 3147448 (1964-09-01), Orlando
patent: 3743960 (1973-07-01), Steudel
patent: 3962652 (1976-06-01), Zarin et al.
patent: 3979698 (1976-09-01), Gollinger

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