Differential switches for voltage controlled oscillator coarse tuning
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United States of America Patent
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Issued Date -
Nov 16, 2006
app pub date -
May 11, 2005
filing date -
May 11, 2005
priority date (Note) -
Abandoned
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Abstract
A voltage controlled oscillator frequency tuner has a first differential switch set and a second differential switch set. Each differential switch set has one pair of switch transistors controlling current to one pair of capacitors. The activating means activates only one set or no sets, and can differential switch switch from the first differential switch set to the second differential switch set. Differential switch switching provides a capacitance difference proportional to the capacitance difference of the first differential switch set capacitor pair and the second differential switch set capacitor pair.
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