Method and circuit for correcting the offset of an...

Amplifiers – With periodic switching input-output

Reexamination Certificate

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C327S552000, C327S553000, C327S554000, C333S017100, C333S172000, C333S173000, C333S174000

Reexamination Certificate

active

07057452

ABSTRACT:
A circuit for correcting the offset of an amplification and filtering chain having a predetermined gain and cut-off frequency depending on the value of at least one capacitor, comprising: a correction means for subtracting from the chain input a correction signal depending on the value of a programmable digital word; a digital automaton for, in a setting phase, searching, then memorizing one of two consecutive values of the digital word between which the output signal of the chain switches sign, the input signal being canceled during a setting phase; and comprising a means for, during the setting phase, reducing the value of said at least one capacitor with respect to its normal operating value.

REFERENCES:
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patent: 6351506 (2002-02-01), Lewicki
patent: 6404578 (2002-06-01), Bhandari et al.
patent: 6429733 (2002-08-01), Pagliolo et al.
patent: 6628163 (2003-09-01), Dathe et al.
patent: 6677814 (2004-01-01), Low et al.
patent: 6686809 (2004-02-01), Nystrom et al.
patent: 2002/0190810 (2002-12-01), Nystrom et al.

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