Oscillators – Automatic frequency stabilization using a phase or frequency... – Search sweep of oscillator
Patent
1985-05-31
1987-01-06
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Search sweep of oscillator
331 10, 331 18, 331 30, 331 36C, 331107DP, 331177V, H03L 712, H03L 724
Patent
active
046349995
ABSTRACT:
A frequency stable RF oscillator 10 comprises a variable frequency RF source in the form of a microwave cavity 24 having a Gunn diode 26 and a varactor 28 mounted therein, and produces an RF output frequency f.sub.o. The output of a frequency stable reference oscillator 14 having a frequency f.sub.r is impressed upon the RF source. Through self-mixing action of the Gunn diode, an IF whose frequency is f.sub.IF =.vertline.nf.sub.r -f.sub.o .vertline. is generated, n being a high harmonic number. The IF is detected by an IF amplifier 18 which forms part of a frequency lock loop controlling the frequency of the RF source.
REFERENCES:
patent: 2972720 (1961-02-01), Hume
patent: 3886471 (1975-05-01), Massani et al.
patent: 4206421 (1980-06-01), Bernhard et al.
patent: 4297648 (1981-10-01), Tucker et al.
patent: 4342009 (1982-07-01), Dixon, Jr.
"New Modular Concept for Phase Locked RF Oscillators" By: Bernhard et al-(published in the Conference Proceedings of the 11th European Microwave Conference, Sep. 7 to 10, 1981, Amsterdam, paper P11, pp. 584 et seq).
Grimm Siegfried H.
Plessey South Africa Limited
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