Method and Apparatus of Capacitively Coupling an Adjustable Capacitive Circuit in a VCO
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United States of America Patent
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Issued Date -
Jul 4, 2013
app pub date -
Dec 30, 2011
filing date -
Dec 30, 2011
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Abandoned
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Abstract
Capacitive adjustment in an RCL resonant circuit is typically performed by adjusting a DC voltage being applied to one side of the capacitor. One side of the capacitor is usually connected to either the output node or the gate of a regenerative circuit in an RCL resonant circuit. The capacitance loading the resonant circuit becomes a function of the DC voltage and the AC sinusoidal signal generated by the resonant circuit. By capacitively coupling both nodes of the capacitor, a DC voltage can control the value of the capacitor over the full swing of the output waveform. In addition, instead of the RCL resonant circuit driving a single differential function loading the outputs, each output drives an independent single ended function; thereby providing two simultaneous operations being determined in place of the one differential function.
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