Voltage controlled oscillator

Details Voltage controlled oscillator Voltage controlled oscillator

2007-12-25

2007-12-25

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S1170FE, C331S167000, C331S17700V, C331S179000

Reexamination Certificate

active

11143461

ABSTRACT:
The voltage controlled oscillator comprises an oscillating system wherein two variable capacitors are alternately connected. The capacitances of these two capacitors vary respectively in the same direction as the voltage that is applied thereto and in the opposite direction. Replacing one variable capacitor by the other is performed automatically when the output frequency of the oscillator reaches a predetermined switching value. It is thus possible to divide an operating frequency band of the oscillator into at least two parts in which the frequency varies alternately in the same direction as the control voltage of the oscillator and in the opposite direction. Switchable fixed capacitors can be connected in the oscillating system, either when one variable capacitor is replaced by the other or by means of a command, to make the oscillator switch from one frequency band to a lower band.

REFERENCES:
patent: 4602222 (1986-07-01), Wynn
patent: 6292065 (2001-09-01), Friedman et al.
patent: 6574288 (2003-06-01), Welland et al.
patent: 6657509 (2003-12-01), Ohannes
patent: 2002/0033741 (2002-03-01), Craninckx et al.
patent: 2002/0167362 (2002-11-01), Justice et al.
patent: 2002/0171499 (2002-11-01), Momtaz et al.
patent: 2003/0189466 (2003-10-01), Kitamura
patent: A 2004-147310 (2004-05-01), None

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