Low-noise voltage reference generator with digitally-filtered reference matching
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United States of America Patent
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Mar 5, 2013
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N/A
app pub date -
Jun 30, 2010
filing date -
Feb 9, 2010
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Abstract
A voltage reference circuit provides a precision voltage reference output without requiring a filter capacitor. The voltage reference output is generated by a digitally-controlled source, which has a value set by the output of a digital filter that filters the output of a comparison circuit that compares the voltage reference output to another reference. A selectable mode can be provided to provide a fast response during a startup/reset period and an optional hold or narrowband response after startup. The mode selection may also offer selection of an externally-supplied digital control value and/or a resistor divider type voltage reference as an alternative to the digitally-controlled source.
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