Capacitive digital integrated circuit pressure transducer

Details Capacitive digital integrated circuit pressure transducer Capacitive digital integrated circuit pressure transducer

1985-05-13

1986-12-02

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

331 65, 361283, G01L 912

Patent

active

046255605

ABSTRACT:
A highly accurate and miniaturized pressure transducer is disclosed which includes first and second capacitors as a part of the integrated circuit, which also includes an Eccles-Jordan astable multivibrator. The miniaturization of both the capacitors and the entire multivibrator circuit in an integrated circuit establishes all components so that they are very closely matched on the two halves of the multivibrator, and so that whatever environmental disturbances, e.g., electrical, thermal, noise, etc., are encountered, are shared by both halves, and hence negated, so far as output drift is concerned. The multivibrator has a rectangular wave output and the duty cycle thereof is proportional to the force or pressure applied. This duty cycle is changed upon applied pressure, which changes one of the capacitors, and measurement of the duty cycle is a measurement of the applied force or pressure. The entire output circuit of the transducer is a digital output to provide digital processing through to a digital display. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

REFERENCES:
patent: 3397278 (1968-08-01), Pomerantz
patent: 3932792 (1926-01-01), Massie
patent: 4227419 (1980-10-01), Park
patent: 4272822 (1981-06-01), Yasuhara
patent: 4295376 (1981-10-01), Bell
patent: 4392383 (1983-07-01), Bauerlen
patent: 4398426 (1983-08-01), Park
patent: 4415948 (1983-11-01), Grantham
patent: 4420790 (1983-12-01), Golke
patent: 4495820 (1985-01-01), Shimada

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