Split varactor array with improved matching and varactor switching scheme
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United States of America Patent
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Jul 15, 2014
Grant Date -
May 2, 2013
app pub date -
Oct 26, 2011
filing date -
Oct 26, 2011
priority date (Note) -
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Abstract
One embodiment of the present invention relates to a digital controlled oscillator. The oscillator includes an oscillator circuit, a varactor array, and a control circuit. The oscillator circuit receives a control word and a signal and generates an oscillator clock signal from the signal at a frequency selected by the control word. The varactor array has a first array of varactor cells having incremental capacitance values and a second array of varactor cells having equal capacitance values. The split varactor array provides a capacitance value. A control circuit is coupled to the oscillator circuit and controls the split varactor array according to the control word. The control circuit sets varactor cells of the split varactor array on or off.
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