Electricity: power supply or regulation systems – Remote sensing
Patent
1974-09-23
1978-01-31
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
73362SC, 307310, 323 19, G01K 700
Patent
active
040718131
ABSTRACT:
A temperature sensor includes a pair of transistors each connected in series with a respective one of a pair of resistors across a source of voltage. The emitters of the transistors are connected together and the collectors are connected to a respective input of a differential amplifier. An output of the amplifier drives a voltage divider circuit having a pair of outputs each connected to the base of a respective one of the transistors. The transistors are operated at different current densities and the ratio of such current densities is maintained constant with changes in temperature by feedback from the amplifier which has an output which is proportional to absolute temperature. In a second embodiment the supply voltage is generated by a current source, such that it will vary with changes in the load thereon. An output of the amplifier is connected to the base of a transistor which is connected across the voltage supply lines and the voltage divider, such that the voltage across the divider varies in accordance with the output of the amplifier. In a third embodiment the two sensing transistors each have a second emitter. The emitter areas of one of the transistors are unequal, such that a potentiometer connected from the first emitters of the transistors to the second emitters of the transistors permits calibration of the ratio of the current density of one transistor to the current density of the other transistor.
REFERENCES:
patent: 3377545 (1968-04-01), Tveit
patent: 3421375 (1969-01-01), Dimon
patent: 3851241 (1974-11-01), Wheatley
Higgins Willis E.
National Semiconductor Corporation
Pellinen A. D.
Woodward Gail W.
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