Crystal tuned voltage controlled oscillator

Details Crystal tuned voltage controlled oscillator Crystal tuned voltage controlled oscillator

1977-01-24

1978-03-28

Kominski, John

Oscillators

Solid state active element oscillator

Transistors

332 26, H03B 536

Patent

active

040817660

ABSTRACT:
A voltage controlled oscillator that is responsive to a crystal which is resonant at a predetermined frequency is provided. A first amplifier having first and second differential outputs is coupled to the crystal. A second amplifier having an output and a differential input for receiving a control voltage is coupled to the first amplifier. First frequency shifting means provide a predetermined phase shift for the first output of the first amplifier and couple this first output to the second amplifier. Second means for providing a predetermined phase shift is coupled to the second amplifier for providing a controllable phase shift to the output of the second amplifier and for providing a phase shift to the second output of the first amplifier. A third amplifier is used to couple the output of the second amplifier to the crystal.

REFERENCES:
patent: 3763439 (1973-10-01), Peil
patent: 3973221 (1976-08-01), Jett, Jr.

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