Differential voltage control oscillator including...

Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation

Reexamination Certificate

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Reexamination Certificate

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11068930

ABSTRACT:
The present invention provides a differential voltage control oscillator including: a parallel resonance circuit in which an inductor circuit, a variable capacitance circuit, and a radio-frequency switching circuit are connected in parallel together; and a negative resistance circuit connected in parallel with the parallel resonance circuit. The radio-frequency switching circuit includes: a first switching element; a first capacitive element; a second switching element; a second capacitive element; a control voltage terminal for supplying a common control voltage to the first and second switching control terminals, the control voltage terminal being connected to a virtual ground point for a differential signal generated in the parallel resonance circuit; a first radio-frequency signal reduction section connected between the control voltage terminal and the first switching element; and a second radio-frequency signal reduction section connected between the control voltage terminal and the second switching element.

REFERENCES:
patent: 6452458 (2002-09-01), Tanimoto
patent: 6687488 (2004-02-01), Elder et al.
patent: 2005/0090218 (2005-04-01), Ishida et al.
patent: 2005/0242898 (2005-11-01), Anand
patent: 2006/0022744 (2006-02-01), Wu
patent: 2006/0103478 (2006-05-01), Brown et al.
patent: 2007/0075798 (2007-04-01), Amano
patent: 10-242826 (1998-09-01), None
Emad Hegazi et al., “A 17-mW Transmitter and Frequency Synthesizer for 900-MHz GSM Fully Integrated in 0.35 μm CMOS”, IEEE Journal of Solid-State Circuits, vol. 38, No. 5, May 2003, pp. 782-792.

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