Simple and reliable temperature measurement circuit

Published:2011/7/28 21:25:00 Author:John | Keyword: temperature measurement | From:SeekIC

Any ordinary diode (eg IN4148), in principle, can be used as a fine electronic thermometer’s sensing element with certain precision. When the diode temperature is increased by 1 degree, its forward voltage drop will reduce 2mV. As shown in the figure, a constant reference voltage is applied to the input end of op-amp A2. A diode and a resistor are applied to the inverting input of op-amp. Therefore, the current flows through the diode and also flows through the resistor. A constant pressure drop should be maintained on the resistor.



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