Temperature sensor circuit

Abstract

The present invention provides a temperature sensor circuit which can selectively obtain voltage with arbitrary temperature coefficients and can easily set up the cross points of these temperature coefficients as the specified temperature. The low voltage movement constant voltage circuit of the band-gap reference voltage circuit composed in a mode that the basic elements contain a positive temperature coefficient representing on the voltage of the resistor and a negative temperature coefficient representing the voltage between the base and emitter of the diode-connected bipolar transistor. The resistor and diode-connected bipolar transistor of the band-gap reference voltage circuit are separated into a transistor-resistor series circuit and a transistor-diode series circuit. The temperature sensor circuit is provided with a first buffer circuit and a second buffer circuit whose input terminals are respectively connected to the collector of the bipolar transistor, and is also providedwith a voltage dividing circuit connected between the output terminal of the first buffer circuit and the output terminal of the second buffer circuit and configured to process potential dividing to the voltage between the two output terminals to obtain arbitrary voltages with different temperature coefficients.

Description

technical field [0001] The present invention relates to a temperature sensor circuit, in particular to a semiconductor temperature sensor circuit, for example, a temperature sensor circuit suitable for use in detecting ambient temperature and performing temperature compensation of electronic circuits. Background technique [0002] Conventionally, for example, as such a temperature sensor circuit, a temperature sensor circuit having a bandgap reference voltage circuit as a basic component and configured to output an output voltage having a predetermined temperature coefficient is known. [0003] Such a temperature sensor circuit is suitably used for temperature compensation in an electronic circuit, for example, to adjust an offset or a gain. [Patent Document 1]: Japanese Patent No. 2897401 [Patent Document 2]: Japanese Patent No. 2666620 [Patent Document 3]: Japanese Patent Publication No. 7-6847 [Patent Document 4]: Japanese Patent Application Laid-Open No. 5-4...

AI Technical Summary

Problems solved by technology

However, the above-mentioned conventional temperature sensor circuit is configured to output a voltage having a temperature coefficient of a predetermined positive or negative value in advance, and is not a temperature sensor configured to selectively obtain a predetermined output voltage having an arbitrary temperature coefficient. circuit

Therefore, in an actual electronic circuit, when some adjustments are made according to the ambient temperature, there is a problem that another circuit is required for making an output voltage having a necessary predetermined temperature coefficient according to the ambient temperature.

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