Filtering apparatus for correcting variation of CR-product

Details Filtering apparatus for correcting variation of CR-product Filtering apparatus for correcting variation of CR-product

2007-04-05

2009-02-17

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S554000, C327S552000

Reexamination Certificate

active

07492216

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.

REFERENCES:
patent: 5942933 (1999-08-01), Yang
patent: 5982228 (1999-11-01), Khorramabadi et al.
patent: 2006/0001482 (2006-01-01), Nakamura et al.
patent: 2004-172911 (2004-06-01), None

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