Temperature compensated pressure transducer with digital output

Details Temperature compensated pressure transducer with digital output Temperature compensated pressure transducer with digital output

1992-03-09

1993-10-19

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

73721, 73727, 374143, G01L 906, G01L 1904

Patent

active

052535320

ABSTRACT:
A pressure transducer apparatus for use with low voltage supply source. A semiconductor piezoresistive strain gauge bridge provides an analog output of pressure variations which includes errors introduced by variations in the ambient temperature. A non-temperature-sensitive resistor across the bridge input is used to decrease the temperature dependent voltage change necessary for temperature compensation of the strain gauge bridge circuit output. Analog temperature adjustment means, provide as an output a current whose value changes concurrently and in direct proportion to the change occurring in the strain gauge bridge circuit current. An analog to digital converter has as its analog input the voltage output of the strain gauge bridge circuit, which is integrated over a first time period, and has as its reference input the temperature-adjusted output current from the analog temperature adjustment means which is integrated over a second time period. Thus by adjusting the reference input to the analog to digital converter, temperature variations in the output of the strain guage bridge are indirectly compensated.

REFERENCES:
patent: 4192005 (1992-03-01), Kurtz
patent: 4510813 (1985-04-01), Kanazawa
patent: 4622856 (1986-11-01), Binder et al.
patent: 4715003 (1987-12-01), Keller
patent: 4765188 (1988-08-01), Krechmery et al.
patent: 4783772 (1988-11-01), Umemoto et al.
patent: 4788521 (1988-11-01), Johnson
patent: 5146788 (1992-09-01), Raynes
patent: 5193393 (1993-03-01), Czarnocki
Motorola Semiconductor Application Note (AN922).

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