Pressure sensor circuit

Details Pressure sensor circuit Pressure sensor circuit

1991-02-04

1993-03-16

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

73766, 73862, 73623, 324105, 324721, G01L 1904

Patent

active

051933934

ABSTRACT:
A pressure sensor circuit (10A) is disclosed which preferably utilizes a piezoresistive pressure transducer (11A) having a substantial temperature coefficient of resistance to provide an inherent temperature variation which is used to implement offset temperature compensation for the circuit. Two operational amplifiers (OA1, OA2) are configured along with selectable resistors (R.sub.1, R.sub.9, R.sub.7, R.sub.8, R.sub.5, R.sub.6 and R.sub.4) to implement four adjustments of the circuit (10A) to adjust span (gain), offset and temperature variation of both span and offset to achieve a desired result. All this is achieved while implementing a common mode gain for the circuit (10A) which is less than 5 and preferably no more than 2.

REFERENCES:
patent: 4798093 (1989-01-01), Kenoun
Nippondenso PRT Circuit Schematic.
Delco PRT Circuit Schematic.
Motorola PRT Circuit Schematic.

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