Low glitch offset correction circuit for auto-zero sensor...

Details Low glitch offset correction circuit for auto-zero sensor... Low glitch offset correction circuit for auto-zero sensor...

2007-08-03

2009-10-20

Mottola, Steven J (Department: 2817)

Amplifiers

With periodic switching input-output

Reexamination Certificate

active

07605646

ABSTRACT:
An instrumentation amplifier includes first (11A) and second (12A) input amplifiers having outputs (15A,B) coupled to an output amplifier (13). A first auto-zero stage (20) in the first input amplifier is auto-zeroed to a first voltage level (VREFL), a first input signal (Vin+) is amplified by a second auto-zero stage (24) in the first input amplifier, and the amplified first input signal is coupled to the output amplifier, during a first phase (A). A third auto-zero stage (44) in the second input amplifier is auto-zeroed to a second voltage level (VREFH), a second input signal (Vin−) is amplified by a fourth auto-zero stage (40) in the second input amplifier, and the amplified second input signal is coupled to the output amplifier, during a second phase (B). The second auto-zero stage is auto-zeroed to the first voltage level, the first input signal is amplified by the first auto-zero stage (20), and the amplified first input signal is coupled to the output amplifier, during a third phase (C). The fourth auto-zero stage is auto-zeroed to a the second voltage level, the second input signal is amplified by the third auto-zero stage, and the amplified second input signal is coupled to the output amplifier, during a fourth phase (D).

REFERENCES:
patent: 7132883 (2006-11-01), Huijsing et al.
patent: 7292095 (2007-11-01), Burt et al.
patent: 7382183 (2008-06-01), Nolan et al.

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