Amplifiers – With periodic switching input-output
Patent
1995-05-10
1996-11-26
Mullins, James B.
Amplifiers
With periodic switching input-output
330146, 330260, 73708, 73721, H03F 345
Patent
active
055789625
ABSTRACT:
A differential amplifier circuit that exhibits low temperature drift and a wide dynamic range includes a differential amplifier having first and second input terminals, first and second circuit nodes operatively connected to the first and second input terminals, respectively, a differential input signal pair, first and second sampling capacitors and a switching circuit. During a first operational phase, the switching circuit connects, a first plate of the first capacitor to a first input signal of the differential input signal pair, connects a first plate of the second capacitor to a second input signal of the differential input signal pair, and connects second plates of the first and second capacitors to a reference voltage. During a second operational phase, the switching circuit connects the first plate of the first capacitor to the second input signal of the differential input signal pair, connects the first plate of the second capacitor to the first input signal of the differential input signal pair, and connects the second plates of the first and second capacitors to respective ones of the first and second circuit nodes. In accordance with another embodiment of the invention, a sensor correction circuit for producing a corrected sensor output signal includes the differential amplifier circuit previously described and a bridge sensor that produces as an output signal the differential input signal pair of the amplifier circuit. A portion of the bridge voltage is used to form a connection voltage used to correct the sensor output signal.
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MCA Technologies, Inc.
Mullins James B.
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