Operational amplifier

Amplifiers – Combined with automatic amplifier disabling switch means

Reexamination Certificate

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Details

C330S009000, C330S302000, C330S067000

Reexamination Certificate

active

07342443

ABSTRACT:
An operational amplifier for canceling an offset and continuously generating an output signal. The operational amplifier includes a first operational amplification unit and a second operational amplification unit each having at least one electrical characteristic that is substantially the same as one another. One of the operational amplification units performs a canceling operation (holding operation and compensation operation) of the offset voltage while the other operational amplification unit performs a non-canceling operation and generates the output voltage by amplifying an input voltage. Both operational amplification units alternately perform the canceling operation and the non-canceling operation.

REFERENCES:
patent: 3988689 (1976-10-01), Ochi et al.
patent: 5396439 (1995-03-01), Yamada
patent: 5703353 (1997-12-01), Blalock et al.
patent: 5757219 (1998-05-01), Weedon et al.
patent: 5796300 (1998-08-01), Morgan
patent: 6507241 (2003-01-01), Ritter
patent: 6529015 (2003-03-01), Nonoyama et al.
patent: 08-018353 (1996-01-01), None
patent: 2001-292041 (2001-10-01), None

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