Voltage controlled oscillator having equally controlled current

Details Voltage controlled oscillator having equally controlled current Voltage controlled oscillator having equally controlled current

1977-04-01

1978-02-07

Grimm, Siegfried H.

Oscillators

Ring oscillators

331108B, 331108C, 331108D, 331117R, 331177R, H03B 502, H03B 512

Patent

active

040729109

ABSTRACT:
The VCO circuit includes means for varying the potential across an inverting stage of a ring oscillator for changing its frequency of oscillation, while maintaining the quiescent point of the stage output centered between the two operating voltages powering the circuit. A current source is connected between the more positive of the two operating voltages and the positive voltage terminal of the stage and a current sink is connected between the more negative of the two operating voltages and the negative voltage terminal of the stage. The current supplied by the current source and the current drawn by the current sink are proportional to an input control voltage and are equal in magnitude. The oscillator stage is biased in the linear portion of its transfer characteristic and provides a conduction path between the current source and the current sink.

REFERENCES:
patent: 3878482 (1975-04-01), Schowe, Jr.
patent: 3904988 (1975-09-01), Hsiao
patent: 3931588 (1976-01-01), Gehweiler

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