Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2008-06-10
2008-06-10
Payne, David C. (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S148000, C375S374000, C257S480000, C352S136000, C438S379000, C455S169200, C455S180400, C455S191200, C455S193300
Reexamination Certificate
active
07386065
ABSTRACT:
A voltage controlled oscillator (VCO), suitable for use in a frequency shift keying (FSK) system. The VCO device comprises a switching varactor unit, having a first terminal and a second terminal, wherein the switching varactor unit produces a capacitance, according to a frequency-selection voltage. A VCO core has a first output terminal, a second output terminal complementary to the first output terminal, and an input terminal. Wherein, the switching varactor unit is coupled in parallel with the VCO core at the first output terminal and the second output terminal to produce a capacitance effect with respect to the capacitance, so as to adjust a frequency constant √{square root over (LC)} of the VCO core.
REFERENCES:
patent: 3962640 (1976-06-01), Bomba
patent: 5629652 (1997-05-01), Weiss
patent: 5650754 (1997-07-01), Joshi et al.
patent: 6091304 (2000-07-01), Harrer
patent: 6163568 (2000-12-01), Lansford et al.
patent: 2003/0052744 (2003-03-01), Suto
Chen Yung-Lung
Lee Fan-Chung
Peng Yuan-Tung
Tu Yih-Min
Dsouza Adolf
J.C. Patents
Novatek Microelectronics Corp.
Payne David C.
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