Offset canceller for compensating for offset in signal output

Details Offset canceller for compensating for offset in signal output Offset canceller for compensating for offset in signal output

2006-09-28

2008-09-09

Pascal, Robert (Department: 2817)

Amplifiers

With periodic switching input-output

C330S253000, C330S260000, C327S307000

Reexamination Certificate

active

07423479

ABSTRACT:
An offset canceller outputs a signal during its offset compensating operation and compensates for the offset by capacitance or resistance devices connected externally to an operational amplifier. A driving circuit includes plural output circuits #1to #n+1 for outputting driving signals to plural output terminals #1to #n on one outputs and for outputting the driving signals on the other outputs coupled to corresponding plural output selectors #1to #n, which then select one of two signals output from two neighboring output circuits to transmit the selected signals to the output terminals. The output circuits #1to #n+1 have other outputs coupled to a decision circuit, which compares the signals to a reference voltage and outputs a decision signal representing the result of comparison at a predetermined timing. The output circuits execute the offset cancel operation responsive to the decision signal.

REFERENCES:
patent: 6118395 (2000-09-01), Kim
patent: 6323798 (2001-11-01), Abe
patent: 6448836 (2002-09-01), Kokubun et al.
patent: 6762643 (2004-07-01), Milanesi
patent: 6930529 (2005-08-01), Tobita
patent: 6946905 (2005-09-01), Kokubun et al.
patent: 7081792 (2006-07-01), Kasai et al.
patent: 2006/0244710 (2006-11-01), Iriguchi et al.

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