Operational amplifier with zero offset

Details Operational amplifier with zero offset Operational amplifier with zero offset

2006-10-27

2008-12-09

Choe, Henry K (Department: 2817)

Amplifiers

With periodic switching input-output

C327S124000

Reexamination Certificate

active

07463087

ABSTRACT:
A circuit for minimizing a voltage offset between inverting and non-inverting input terminals of an operational amplifier circuit is provided. The circuit includes a chopper circuit connected to the inverting and non-inverting input terminals of the operational amplifier circuit, the chopper circuit including: an amplifier having differential outputs; and a switching circuit for periodically reversing the input terminals to the amplifier and periodically reversing the outputs of the amplifier to provide an output signal having an offset adjustment signal to the operational amplifier circuit to adjust the offset of the operational amplifier circuit.

REFERENCES:
patent: 4423385 (1983-12-01), Evans et al.
patent: 4931745 (1990-06-01), Goff et al.
patent: 5959498 (1999-09-01), Sauer
patent: 6002299 (1999-12-01), Thomsen
patent: 6734723 (2004-05-01), Huijsing et al.
patent: 7292095 (2007-11-01), Burt et al.

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