Chopper chopper-stabilized instrumentation and operational...

Details Chopper chopper-stabilized instrumentation and operational... Chopper chopper-stabilized instrumentation and operational...

2006-11-07

2006-11-07

Choe, Henry (Department: 2817)

Amplifiers

With periodic switching input-output

C327S124000

Reexamination Certificate

active

07132883

ABSTRACT:
Chopper chopper-stabilized instrumentation and operational amplifiers having ultra low offset. The instrumentation amplifiers use current-feedback, and include, in addition to a main chopper amplifier chain, a chopper stabilized loop for correcting for the offset of the input amplifiers for the input signal and for receiving the feedback of the output voltage sense signal. Additional loops, which may include offset compensation and autozeroing loops, may be added to compensate for offsets in the chopper stabilized loop for correcting for the offset of the input amplifiers. Similar compensation is disclosed for decreasing the offset in operational amplifiers.

REFERENCES:
patent: 4559502 (1985-12-01), Huijsing
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patent: 6456159 (2002-09-01), Brewer
patent: 6559720 (2003-05-01), Huijsing et al.
patent: 6734723 (2004-05-01), Huijsing et al.
Van Den Dool, Bernard J., et al., “Indirect Current Feedback Instrumentation Amplifier with a Common-Mode Input Range that Includes the Negative Rail”, IEEE Journal of Solid-State Circuits, Jul. 1993, pp. 743-749, vol. 28, No. 7.
Huijsing, Johan H., “Operational Amplifiers Theory and Design”, Mar. 2001, p. 408, Kluwer Academic Publishers.
Linear Technology Corporation, “LTC6800 Rail-to-Rail Input and Output, Instrumentation Amplifier”, 2002, pp. 1-12.

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