Two terminal temperature transducer having circuitry which contr

Details Two terminal temperature transducer having circuitry which contr Two terminal temperature transducer having circuitry which contr

1993-10-26

1995-02-28

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323314, 323907, G05F 330

Patent

active

053940784

ABSTRACT:
A two terminal temperature transducer which controls its operating current to indicate the temperature, by producing a linear response to temperature which can be set to extrapolate to a desired temperature. The transducer including circuitry which controls its operating current to be linearly proportional with temperature. The circuitry operates to produce a first reference voltage which is proportional to absolute temperature, produce a second reference voltage which is complementary to absolute temperature, generate a voltage drop corresponding to the operating current, compare the voltage drop to a temperature sensitive voltage corresponding to the difference between the first reference voltage and the second reference voltage, and adjust the operating current so as to equilibrate the voltage drop and the temperature sensitive voltage. According to one embodiment, the transducer includes an amplifier with a proportional to absolute temperature input offset voltage to drive a temperature proportional current through a series resistor, and includes circuitry to offset one input of the amplifier so as to cause the extrapolated slope of the temperature proportional current to pass through zero at a selected temperature.

REFERENCES:
patent: 3940760 (1976-02-01), Brokaw
patent: 4071813 (1978-01-01), Dobkin
patent: 4123698 (1978-10-01), Timko et al.
patent: 4176308 (1979-11-01), Dobkin et al.
patent: 4497586 (1985-02-01), Nelson
Brokaw, A. Paul, "A Monolithic Conditioner for Thermocouple Signals", IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6, Dec. 1983, pp. 707-716.
Timko, Michael P., "A Two-Terminal IC Temperature Transducer", IEEE Journal of Solid-State Circuits, vol. SC-11, No. 6, Dec. 1976, pp. 784-788.

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