High Q linear controlled variable capacitor using translinear amplifier
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United States of America Patent
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Sep 1, 2009
Grant Date -
Jul 14, 2005
app pub date -
Jan 26, 2004
filing date -
Jan 14, 2004
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Abstract
A voltage controlled variable capacitor, formed of a larger number of fixed capacitor segments and a corresponding number of switching elements, uses translinear amplifiers to control each switching element. Each translinear amplifier linearly switches from the fully off to the fully on state; a minimum number of switching stages (ideally only one) is in the mode-of-change at any one time with a minimum overlap. The arrangement achieves a nearly linear change of capacitance at linear tuning voltage change, while resulting in high Q-factor due to the low RDSon and high RDSoff of the fully switched stages. The invention eliminates temperature and voltage dependencies of other solutions like varactor diodes.
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