Temperature detecting device

Details Temperature detecting device Temperature detecting device

1979-06-06

1981-08-04

Myracle, Jerry W.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01K 720

Patent

active

042815444

ABSTRACT:
A temperature detecting device comprises a temperature detecting element such as a thermistor for sensing temperature changes and a MOS-transistor connected in series with the temperature detecting element. A constant voltage source maintains a constant reference voltage. A voltage comparing circuit compares the voltage across the MOS-transistor or the voltage across the temperature detecting element with the constant reference voltage during periods when the MOS-transistor is turned ON and produces an output signal representative of the temperature. A plurality of MOS-transistors can be used in which case they are connected in parallel with each other and are connected in series with the temperature detecting element. The plurality of MOS-transistors are sequentially turned ON to enable the voltage comparing circuit to compare either the voltages across the MOS-transistors or the voltage across the temperature detecting element with the constant reference voltage during the periods when the MOS-transistors are turned ON.

REFERENCES:
patent: 4121461 (1978-10-01), Butler et al.
patent: 4165642 (1979-08-01), Lipp

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