Voltage controlled oscillator with partial load-pull tuning

Details Voltage controlled oscillator with partial load-pull tuning Voltage controlled oscillator with partial load-pull tuning

1996-12-20

1998-11-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331117R, 331177V, H03B 512

Patent

active

058382070

ABSTRACT:
A voltage controlled oscillator has an active circuit, a resonant circuit coupled to the input node of the active circuit and an adjustable impedance circuit coupled to an output node of the active circuit. The impedance of the adjustable impedance circuit may be altered to tune the oscillation frequency of the oscillator. In one embodiment, the adjustable impedance circuit includes a varactor diode in series with a capacitor and means for varying the voltage across the varactor diode. An isolation circuit is coupled to an output node of the active circuit. In one embodiment, the isolation circuit is connected to a different output node than the adjustable impedance circuit is connected to.

REFERENCES:
patent: 3581239 (1971-05-01), Knutson
patent: 4520326 (1985-05-01), Clemens
patent: 4749962 (1988-06-01), Doornenbal
patent: 5105162 (1992-04-01), Fleissner et al.
patent: 5107228 (1992-04-01), Pham et al.
patent: 5444422 (1995-08-01), Mycynek
patent: 5512862 (1996-04-01), Avanic et al.

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