Frequency tuning and step control of a digitally controlled oscillator
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United States of America Patent
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Jun 30, 2015
Grant Date -
Jun 19, 2014
app pub date -
Dec 14, 2012
filing date -
Dec 14, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A variable leaf capacitor is disclosed. In accordance with some embodiments of the present disclosure, a variable leaf capacitor may comprise a first alternating current coupling capacitor having a first terminal coupled to a first differential node and a second terminal coupled to a first common-mode node, a second alternating current coupling capacitor having a first terminal coupled to a second differential node and a second terminal coupled to a second common-mode node, and a varactor having a bias terminal, a first common-mode terminal coupled to the first common-mode node, and a second common-mode terminal coupled to the second common-mode node, wherein the capacitance of the varactor is based on the voltage from the first common-mode terminal of the varactor to the bias terminal of the varactor and on the voltage from the second common-mode terminal of the varactor to the bias terminal of the varactor.
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