Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Patent
1977-07-20
1978-06-27
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
331 16, 331 31, H03B 304
Patent
active
040978168
ABSTRACT:
A system is disclosed for generating a plurality of preselected frequencies in a radio frequency device such as a receiver, transmitter or transceiver. It comprises means for generating a first reference signal having a predetermined frequency and means, including at least two voltage controlled oscillators (VCO), a mixer, a programmable frequency divider, and a switch, for generating a second reference signal, with the mixer being coupled to the first reference signal generating means and being selectively coupled on one of the VCO's by the switch to generate an output signal having a frequency corresponding to the difference between the frequency of said first reference signal and the frequency of the selected variable-frequency oscillator. Means are coupled to the first reference signal generating means and to the second reference signal generating means for comparing the first and second reference signals and developing a control signal which varies systematically in accordance with the frequency difference between the first and second reference signals, with the control signal being applied to both the VCO's to vary the oscillation frequencies thereof until the frequency of the second reference signal is substantially equal to the predetermined frequency of the first reference signal, whereby the output signal of the selected VCO has a frequency which corresponds to one of the plurality of predetermined receiver frequencies as selected by both the programmable frequency divider and the VCO selected by the switch.
REFERENCES:
patent: 3863174 (1975-01-01), Klinger
Imazeki Kazuyoshi
Kazami Koichi
General Research of Electronics Inc.
Kominski John
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