Microwave synthesizer
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Nov 1, 1991
filing date -
Nov 1, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A millimeter wave synthesizer is described which comprises a Gunn oscillator mechanically tuned so that its bandwidth includes the selected harmonic of the output of an L-band synthesizer. The output of the synthesizer and the Gunn oscillator are applied to a sampling phase detector. If the frequency of the output of the oscillator is exactly the same as the harmonic selected, the detector will provide a DC signal. If the frequency of the oscillator output is different from that of the selected harmonic, the detector will provide a AC signal. A loop filter and search circuit respond to this AC signal to provide a sawtooth signal fed to the oscillator in an automatic search process causing the frequency of the oscillator output to be adjusted until it is locked to the selected harmonic of the synthesizer. The output of the synthesizer can be tuned remotely to compensate for temperature and aging effects.
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