Oscillator, synthesizer tuner circuit and AM synchronous detect

Details Oscillator, synthesizer tuner circuit and AM synchronous detect Oscillator, synthesizer tuner circuit and AM synchronous detect

1995-03-21

1996-01-02

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 8, 331 18, 331 23, 331 36C, 331 45, 331158, 331177V, 329325, 329326, 329360, 327105, 455260, 455318, 455337, H03B 536, H03D 100, H03D 300, H03L 716

Patent

active

054812275

ABSTRACT:
An oscillator capable of setting a desired frequency by using only two resonators without setting up any additional adjustment processes, and a synthesizer tuner circuit with an AM synchronous detect circuit. The oscillator comprises: a first oscillator oscillating at a desired frequency as a result of inputting a voltage from a parallelly-connected first resonator and first voltage-variable capacitor to a current feedback loop of a first amplifier and controlling a voltage applied to the first voltage-variable capacitor; a second oscillator oscillating at a desired frequency as a result of inputting a voltage from a parallelly-connected second resonator and second voltage-variable capacitor to a current feedback loop of a second amplifier and controlling a voltage applied to the second voltage-variable capacitor; a voltage generator for generating a voltage to be applied to the first voltage-variable capacitor and a voltage to be applied to the second voltage-variable capacitor by comparing outputs from the first and second oscillators; and a controller for making oscillating frequencies for the first and second oscillators coincide in a phase-locked loop constructed so that the polarities of the voltages applied to the first and second voltage-variable capacitors are different.

REFERENCES:
patent: 2245627 (1941-06-01), Varian
patent: 3177442 (1965-04-01), Halverson
patent: 4131861 (1978-12-01), Malaviya
patent: 4234929 (1980-11-01), Riley, Jr.

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