Sensor device and a signal amplification device of a small...

Details Sensor device and a signal amplification device of a small... Sensor device and a signal amplification device of a small...

2007-01-09

2007-01-09

Nguyen, Patricia (Department: 2817)

Amplifiers

With periodic switching input-output

C330S302000, C330S075000

Reexamination Certificate

active

10963918

ABSTRACT:
An amplification device for a small detection signal has an amplification factor that is variable and also high accuracy offset cancellation. A first switching element selectively connects a normal phase input terminal of an operational amplifier either to a reference potential or to an output terminal of a sensor. An inverse phase input terminal is connected to the reference potential. A capacitor is connected to an output terminal of the operational amplifier and to an output buffer, a second switching element is arranged to selectively connect the capacitor to the reference potential. Resistors are selectively short circuited by switching elements to vary the amplification factor of the operational amplifier.

REFERENCES:
patent: 4733171 (1988-03-01), Milkovic
patent: 4906996 (1990-03-01), George
patent: 5319370 (1994-06-01), Signore et al.
patent: 5811808 (1998-09-01), Cannata et al.
patent: 6459078 (2002-10-01), Fowler
patent: 6-045875 (1994-02-01), None
patent: 6-054118 (1994-02-01), None
patent: 9-218090 (1997-08-01), None

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