Dual frequency voltage controlled oscillator

Details Dual frequency voltage controlled oscillator Dual frequency voltage controlled oscillator

1997-03-05

1999-01-05

Nelms, David

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331 36C, 331117R, 331117V, H03B 520

Patent

active

058567631

ABSTRACT:
A voltage controlled oscillator (10) operable on two widely separated frequency bands of 800 MHz and 1.9 GHz, for example. The two operable frequency modes are controlled by changing base bias voltages on at least two transistors with commonly connected emitters. A base circuit of each transistor is connected to an independent resonator and tuning element and shares a common feedback reactance. By increasing a base bias voltage of first transistor relative the a second transistor, an associated first base circuit is turned on and allowed to oscillate at a first frequency while a second base circuit is turned off preventing oscillation at a second frequency. Correspondingly, by decreasing the base bias voltage the first base circuit is turned off and the second base circuit is turned on. The transistors share a common collector connection and output providing either one of the two frequencies.

REFERENCES:
patent: 3579115 (1971-05-01), Goncharoff
patent: 3579281 (1971-05-01), Kam
patent: 4621241 (1986-11-01), Kiser
patent: 5107228 (1992-04-01), Pham et al.
patent: 5245298 (1993-09-01), Pham
patent: 5418497 (1995-05-01), Martin
patent: 5418500 (1995-05-01), Igarashi
patent: 5497128 (1996-03-01), Sasaki
patent: 5534825 (1996-07-01), Goma et al.
patent: 5535432 (1996-07-01), Dent
patent: 5576667 (1996-11-01), Goma
patent: 5600297 (1997-02-01), Mori

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