Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1982-02-26
1984-10-02
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340507, 340588, 340589, 374181, 374182, 330256, 330266, 330272, 330289, 307310, 307591, 136213, G08B 2300, G01K 712
Patent
active
044751036
ABSTRACT:
An integrated-circuit thermocouple signal conditioner having on a single chip an amplifier and a transistor circuit responsive to the chip temperature for developing a cold-junction compensation signal referred to 0.degree. 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 connected through a feedback network to the input of the other differential 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 comprises two components having positive and negative temperature coefficients. The IC chip also includes alarm transistors for indicating overload conditions resulting from open-circuited thermocouple leads or other overloads.
REFERENCES:
patent: 3671953 (1972-06-01), Goldberg
patent: 3921453 (1975-11-01), Platzer
patent: 3956686 (1976-05-01), Tanaka
patent: 4120201 (1978-10-01), Wargo
patent: 4126042 (1978-11-01), Lynch
Analog Devices, "Two-Terminal IC Temperature Transducer", Oct. 1977.
Electronic Data News (EDN), Aug. 4, 1983, pp. 108, 112-114, 116.
IEEE Journal of Solid State Circuits, vol. SC-15, No. 3, Jun. 1980, Gerard C. M. Meijer.
IEEE Journal of Solid State Circuits, vol. SC-15, No. 6, Dec. 1980, Gerard C. M. Meijer.
Brokaw Adrian P.
Gilbert Barrie
Analog Devices Incorporated
Crosland Donnie L.
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