Microwave frequency synthesizer

Details Microwave frequency synthesizer Microwave frequency synthesizer

1997-10-01

1999-12-21

Kinkead, Arnold

Oscillators

Beat frequency

Frequency stabilization

331 2, 331 1R, 331 37, 331176, 455 76, 455260, 327105, H03B 2102

Patent

active

060054468

ABSTRACT:
An apparatus and method for synthesizing low-noise, high stability, multi-frequency microwave signals is disclosed. The output frequencies of a lower frequency, low-noise, synthesizer are upconverted to higher microwave frequencies by mixing these frequencies with the output frequency of an ultra low noise microwave oscillator, determined by a very high Q resonator. Such resonators exhibit large frequency dependence on temperature, but the frequency of an ultra low noise microwave oscillator cannot be stabilized by phase-lock to a stable reference because of its very narrow voltage-controlled frequency tuning range, caused by the very high Q of the resonator. The microwave synthesizer output frequency stabilization is achieved by a novel phase-lock loop which uses the frequency tunability of a low noise SAW oscillator to compensate for the frequency drift of the microwave oscillator. The system does not require the very precise temperature control of a high Q resonator that otherwise would be needed to control the output frequency of a microwave synthesizer.

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