Filtering apparatus for correcting variation of CR-product
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United States of America Patent
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Feb 17, 2009
Grant Date -
Jun 12, 2008
app pub date -
Apr 5, 2007
filing date -
Apr 5, 2006
priority date (Note) -
Expired
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Abstract
A filtering apparatus includes a main filter, a variation detection circuit, and a variation correction circuit. The variation detection circuit includes a reference filter having at least one resistor and at least one capacitor, detects a variation of CR-product based on the resistor and the capacitor of the reference filter in response to each of a plurality of reference signals having different frequencies from each other, and then outputs a variation detection signal indicating a detected result. The variation correction circuit corrects frequency characteristics of the main filter on the basis of the variation detection signal.
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