Method and apparatus with improved varactor quality factor
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United States of America Patent
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Issued Date -
Feb 16, 2006
app pub date -
Aug 8, 2005
filing date -
Aug 13, 2004
priority date (Note) -
Abandoned
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Abstract
An embodiment of the present invention provides an apparatus, comprising a varactor; and at least one external high-Q fixed capacitors combined with the varactor thereby improving the Q of the varactor. The at least one external high-Q fixed capacitor may combined in series with the varactor or in parallel with the varactor. Further, the varactor may be constructed of an internal low-tuning high-Q material with high-Q and large capacitance but low tuning range. The apparatus of one embodiment of the present invention may be incorporated into a 4-pole bandpass filter enabling Q improvement on the circuit performance or also may be incorporated into an amplifier or a voltage controlled oscillators or a phase shifters. Another embodiment of the present invention provides an apparatus, comprising a resonator and a varactor variably coupled into the resonator through an RF transformer, wherein by varying a coupling factor, the Q-factor and the tunability of the apparatus is capable of being affected.
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