Output circuit for pressure sensor

Details Output circuit for pressure sensor Output circuit for pressure sensor

1997-07-22

1999-05-18

Noland, Thomas

Measuring and testing

Dynamometers

Responsive to multiple loads or load components

73862628, 73 115, 73 162, G01L1/18;25/00

Patent

active

059052090

ABSTRACT:
A circuit is provided for scanning and outputting a pressure sensor having at least one sensor point which sensor point is formed at each intersection of at least one first electrode and at least one second electrode, there being a pressure sensitive resistance between the electrodes at each sensor point. The circuit includes a reference potential generator the output from which is applied at an output end of each second electrode, a first potential source which is connected to each first electrode when a sensor point intersected by the first electrode is to be scanned and a ratiometric A/D converter which has as inputs a second potential source, an output derived from the second electrode intersecting the sensor point being scanned and the reference potential. The output from the converter is the circuit output. Depending on the values of the two potentials, sensitivity either increases or decreases with increasing value of the reference potential, the circuit having a significant gain which provides a relatively large dynamic range for sensitivity.

REFERENCES:
patent: 4856993 (1989-08-01), Maness et al.
patent: 5010774 (1991-04-01), Kikuo et al.
patent: 5429006 (1995-07-01), Tamori
patent: 5505072 (1996-04-01), Oreper
patent: 5515738 (1996-05-01), Tamori
patent: 5756904 (1998-05-01), Oreper et al.

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