LC voltage controlled oscillator with tunable capacitance unit
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United States of America Patent
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Issued Date -
Nov 6, 2008
app pub date -
May 4, 2007
filing date -
May 4, 2007
priority date (Note) -
Abandoned
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Abstract
A tunable capacitance unit coupled between a pair of circuit nodes. The tunable capacitance unit comprises a tuning input supplying a tuning voltage, and first and second tuning capacitance units. Each of the tuning capacitance units comprises a pair of accumulation-mode MOS varactors with source/drains thereof coupled to the tuning input, a pair of blocking capacitors coupled to a respective gate of the accumulation-mode MOS varactors and to a respective one of the circuit nodes, and a pair of biasing resistors coupled to a respective gate of the accumulation-mode MOS varactors and to a respective bias terminal receiving a respective reference voltage. The reference voltages received by the first and second tuning capacitance units are symmetrical to a predetermined voltage.
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