Tuning system for a microwave local oscillator

Details Tuning system for a microwave local oscillator Tuning system for a microwave local oscillator

1975-04-02

1976-03-09

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 16, 331 17, 331107G, 331175, 331176, H03B 304

Patent

active

039434591

ABSTRACT:
A variable frequency voltage controlled oscillator is tuned to a selected frequency by applying a varying voltage to the control port of the oscillator to sweep the oscillator signal through a frequency range which includes the frequency of a reference frequency source. The value of the varying voltage is stored at the instant the oscillator frequency coincides with the frequency of the reference source. A dc offset voltage is then added to the stored voltage to produce a sum voltage which is substituted for the varying voltage at the control port of the oscillator to tune the oscillator to the selected frequency. The offset voltage is equal to the difference in the control voltages at the selected and reference frequencies and may be determined from the oscillator control voltage characteristic.
The oscillator can be set reliably to a selected frequency without using temperature compensation, provided that, at each frequency in a range of interest, the rate of change df/dv of the oscillator frequency with respect to the change in control voltage is constant despite changes in temperature.

REFERENCES:
patent: 3764933 (1973-10-01), Fletcher
patent: 3793594 (1974-02-01), Griswold

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