Circuit for self compensation of silicon strain gauge pressure t

Details Circuit for self compensation of silicon strain gauge pressure t Circuit for self compensation of silicon strain gauge pressure t

1998-01-27

2000-08-22

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

327378, 330256, H01L 3500

Patent

active

061078611

ABSTRACT:
A circuit for compensating a silicon strain gauge pressure transmitter. The circuit includes: a current source, an embodiment of which may include an amplifying device and means for supplying the current source with an electric potential, a strain gauge bridge, a plurality of resistances that includes a feedback resistance, a series resistance, a current sampling resistance, and a load with parameters. The key to this invention is to add a series resistance and a feedback resistance to the circuit which eliminates the need for R.sub.c, the current sample resistor, to be a thermistor, and increases the operating temperature range of the sensor by compensating the sensor's parameter variations with temperature.

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