Method for temperature compensation and measuring circuit theref

Details Method for temperature compensation and measuring circuit theref Method for temperature compensation and measuring circuit theref

1985-07-23

1987-12-22

Kemeny, Emanuel S.

Boots, shoes, and leggings

73766, 364557, G06F 1520

Patent

active

047150033

ABSTRACT:
A measurement circuit for carrying out a method of compensation, in particular for a piezoresistive pressure transducer with a measurement bridge (7) and a following output/differential amplifier (15) further comprises a current supply circuit (13). To enable an optimal temperature compensation for the measurement bridge (7) with maximum resolution of the pressure measurement signal, a digitalized compensation circuit with an analog/digital converter (21), a memory (23) and at least one digital/analog converter (25, 27) is connected ahead of the output/differential amplifier (15). The temperature dependent voltage difference/input signal at the measurement bridge (7) is digitalized via the following converter (21) and converted to compensation values stored in the memory (23). These values are converted into an analog compensation signal in a converter (25, 27). For analog measured value determination per se, only error compensation is carried out in digitalized fashion (FIG. 2).

REFERENCES:
patent: 3490272 (1970-01-01), Russell
patent: 3654545 (1972-04-01), Demark
patent: 3899695 (1975-08-01), Solomon et al.
patent: 4192005 (1980-03-01), Kurtz
patent: 4226125 (1980-10-01), Waugh
patent: 4419620 (1983-12-01), Kurtz et al.
patent: 4510813 (1985-04-01), Kanazawa
"Integration Brings a Generation of Low-Cost Transducers", Zias et al.; Electronics, Dec. 4, 1972; pp. 83-88.
IBM Technical Disclosure Bulletin, vol. 15, No. 6, Nov. 1972, "Measurement System" A. H. Nay, pp. 1896-1897.

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