Low-noise fine-frequency tuning
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United States of America Patent
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Feb 22, 2011
Grant Date -
Oct 30, 2008
app pub date -
May 2, 2008
filing date -
Aug 1, 2005
priority date (Note) -
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Abstract
Circuits, methods, apparatus, and code that provide low-noise and high-resolution electronic circuit tuning. An exemplary embodiment of the present invention adjusts a capacitance value by pulse-width modulating a control voltage for a switch in series with a capacitor. The pulse-width-modulated control signal can be adjusted using entry values found in a lookup table, by using analog or digital control signals, or by using other appropriate methods. The capacitance value tunes a frequency response or characteristic of an electronic circuit. The response can be made to be insensitive to conditions such as temperature, power supply voltage, or processing.
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