Integrated-circuit thermocouple signal conditioner

Details Integrated-circuit thermocouple signal conditioner Integrated-circuit thermocouple signal conditioner

G - Physics

01

K

330/31, 73/61, 3

G01K 7/02 (2006.01) G01K 7/13 (2006.01)

Patent

CA 1191715

ABSTRACT OF THE DISCLOSURE An integrated-circuit thermocouple signal conditioner having on a single chip an amplifier and means responsive to the chip temperature for developing a cold-junction compensation sig- nal referred to 0° Celsius. The amplifier includes two matched differential input amplifiers the outputs of which are summed and used to control a high-gain main amplifier. Thermocouple signals are applied to one of the input amplifiers, serving as a floating input stage, and the main amplifier output is con- nected through a feedback network to the input of the other dif- ferential amplifier. A cold junction compensation signal also is applied to the input of the other differential amplifier. The compensation is a differential voltage proportional to the Celsius temperature of the chip; the compensation voltage com- prises two components having positive and negative temperature coefficients. The IC chip also includes alarm means for indicat- ing overload conditions resulting from open-circuited thermo- couple leads or other overloads. -1-

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