Apparatus and method for dynamic DC offset detection and...

Details Apparatus and method for dynamic DC offset detection and... Apparatus and method for dynamic DC offset detection and...

2007-02-27

2007-02-27

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S307000, C455S114200, C455S278100, C375S319000, C375S285000, C375S346000, C327S307000

Reexamination Certificate

active

10795076

ABSTRACT:
A fixed impedance in parallel with a variable impedance form a high pass filter with a capacitor. An input signal is provided to the capacitor. The value of the variable impedance is controlled in relation to the magnitude of a dynamic DC offset in the input signal to control the corner frequency of the high pass filter, providing a higher corner frequency and more rapid suppression of dynamic DC offset for larger dynamic DC offset magnitudes.

REFERENCES:
patent: 6437639 (2002-08-01), Nguyen et al.
patent: 6882216 (2005-04-01), Kang
patent: 2003/0072320 (2003-04-01), Seo et al.
patent: 2003/0086516 (2003-05-01), Wagner
patent: 2003/0222716 (2003-12-01), Kumeta et al.
patent: 2004/0097212 (2004-05-01), Matsumoto et al.
patent: 2004/0169532 (2004-09-01), Kim
patent: 2004/0176055 (2004-09-01), Vepsalainen et al.
patent: 2004/0247046 (2004-12-01), Hsiao

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