Frequency stabilized microwave signal source

Details Frequency stabilized microwave signal source Frequency stabilized microwave signal source

1977-01-03

1978-01-10

Griffin, Robert L.

Oscillators

Relaxation oscillators

325363, 331 1A, 331 18, H03B 304

Patent

active

040681734

ABSTRACT:
The frequency of a microwave oscillator is stabilized by coupling a portion of the RF signal therefrom to an HF oscillator operating at a sub-multiple of the microwave frequency and producing a strong harmonic at the microwave frequency in order to cause the operation of the microwave and HF oscillators to be locked together. The HF signal frequency, which includes any drift in the microwave oscillator frequency, is divided down a specified amount and compared with the frequency of a stable crystal reference oscillator in a comparator. The output of the comparator is a DC error voltage which is proportional to any drift in the frequency of the microwave oscillator. This error voltage is applied to the microwave oscillator to cause the operating frequency thereof to be more nearly constant.

REFERENCES:
patent: 2356201 (1944-08-01), Beers
patent: 3350658 (1967-10-01), Walker
patent: 3486134 (1969-12-01), Seidel
patent: 3573650 (1971-04-01), Maltese
patent: 3921094 (1975-11-01), Schaible
patent: 4030045 (1977-06-01), Clark
A Frequency-Dividing Locked-In Oscillation Frequency Modulation Receiver, Proceeding of IRE, Dec. 1944, pp. 730-737.

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