Voltage controlled oscillator with improved voltage versus frequ

Details Voltage controlled oscillator with improved voltage versus frequ Voltage controlled oscillator with improved voltage versus frequ

1994-10-24

1995-12-19

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

331177V, H03B 532

Patent

active

054771978

ABSTRACT:
An undesirable relationship between user applied input frequency control voltage and output frequency of a voltage controlled oscillator is counteracted by controlling the characteristics of an amplifier stage in the oscillator as a function of frequency control signal in addition to controlling the output frequency of the oscillator as a function of the capacitance of a user controlled variable capacitance in response to the frequency control signal.

REFERENCES:
patent: 4667170 (1987-05-01), Lofgren et al.
patent: 4853655 (1989-08-01), Embree et al.
patent: 4887053 (1989-12-01), Embree et al.
patent: 4970472 (1990-11-01), Kennedy et al.
patent: 4973922 (1990-11-01), Embree et al.
"The Current Dependency of Crystal Unit Resistance at Low Drive Level" Proceedings of the 25th Annual Symposium on Frequency Control Apr. 26-28, 1971, U.S. Army Electronics Command, Fort Monmouth, New Jersey pp. 139-147.
"A Simple Model for Quartz Resonator Low Level Drive Sensitivity" Forty-Fifth Annual Symposium on Frequency Control, L. Dworsky and R. Kinsman, Motorola, Inc., IEEE 1991, pp. 148-155.

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