Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Using a particular bridge circuit
Patent
1995-05-10
1998-06-09
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Using a particular bridge circuit
364573, 324706, 324721, G01R 1702
Patent
active
057640670
ABSTRACT:
The present invention, generally speaking, provides for highly accurate correction of a sensor output using circuitry that is compact and inexpensive. In accordance with one embodiment of the invention, an output signal of a sensor having a sensitivity that varies as a function of temperature and that includes resistors connected to form a bridge is corrected by, first, modeling the sensitivity of the sensor using an expression that is the ratio of two polynomials; applying a voltage across the bridge; and controlling the applied voltage as a function of temperature substantially in accordance with the inverse expression. In accordance with another embodiment of the invention, a circuit for correcting an output signal of a sensor having a sensitivity that varies as a function of temperature and that includes resistors connected to form a bridge, includes circuitry for applying a voltage across the bridge, and circuitry for controlling said voltage as a function of temperature substantially in accordance with an expression that is the ratio of two polynomials, in which constants a and b are chosen such that an inverse expression approximates the sensitivity of the sensor. Preferably, the circuit is an analog integrated circuit.
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