Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2007-12-18
2007-12-18
Tran, Pablo N. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
Reexamination Certificate
active
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.
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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.
Adachi Hisashi
Hiraoka Yukio
Takinami Koji
Tsukizawa Takayuki
Tran Pablo N.
Wenderoth , Lind & Ponack, L.L.P.
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