Correction circuit for linearizing output of temperature sensor

Details Correction circuit for linearizing output of temperature sensor Correction circuit for linearizing output of temperature sensor

1998-07-16

2000-08-08

Gutierrez, Diego

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

374183, 327512, G01K 700

Patent

active

060991631

ABSTRACT:
A circuit for correcting a non-linear output of an electronic temperature sensor due to a non-linear drift over an operating range of temperature. The circuit includes a first circuit portion for adjusting a bias voltage of the sensor to a select initial voltage. The circuit also includes second circuit portion interfacing with the first circuit portion. The second circuit portion comprises at least one electronic element with a non-linear drift over the operating range of temperature, but in a direction opposite that of the drift of the temperature sensor. Thus, the drift of the electronic element alters the bias voltage over the operating range in a manner that compensates (at least partially) for the non-linear drift of the temperature sensor.

REFERENCES:
patent: 2971379 (1961-02-01), Weisheit
patent: 3052124 (1962-09-01), Averitt
patent: 3472073 (1969-10-01), Irani
patent: 3882725 (1975-05-01), Rao et al.
patent: 3933046 (1976-01-01), Ebrecht
patent: 3973147 (1976-08-01), Yu
patent: 4000454 (1976-12-01), Brakl
patent: 4215336 (1980-07-01), Smith
"Linear Device Data Book" (1994 National Semiconductor Corporation), pp. 1-11 of the section entitled "LM135/LM235/LM334, LM135A/LM235A/LM335A Precision Temperature Sensors". May 1992.

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