A high precision temperature sensor circuit

Abstract

A high-precision temperature sensor circuit belongs to the technical field of electronic circuits. First, use the bandgap reference module to generate a bandgap reference voltage and a positive temperature coefficient voltage, and then use two identical voltage-frequency conversion circuits to convert the positive temperature coefficient voltage and the bandgap reference voltage into positive temperature coefficient voltage frequency and bandgap The reference voltage frequency is finally counted by two counters. When the second counter is full, the first counter stops counting through the feedback signal. The temperature value is obtained by obtaining the ratio of the positive temperature coefficient voltage to the bandgap reference voltage. The designed temperature The sensor structure is simple and can achieve low power consumption; the chopper op amp is used in the bandgap reference module to eliminate the error caused by the offset of the op amp, and a system chopper module is added after the bandgap reference module to reduce the comparator offset voltage Error in temperature detection. The invention has the advantages of simple structure, low power consumption and small temperature measurement error.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a high-precision temperature sensor circuit. Background technique [0002] Temperature is a physical phenomenon, which has a profound impact on us in production, life and all walks of life. Therefore, both industrial and agricultural production and scientific research are inseparable from temperature measurement and temperature sensors. Especially with the rise of the Internet of Things upsurge in recent years, temperature sensors, as the basic components of the Internet of Things, have continuously expanded their market applications. Designing a temperature sensor in the circuit system helps to improve the stability and ease of detection of the temperature of the entire circuit system. [0003] Most of the traditional temperature sensors use the signal modulator Sigma-Delta ADC to realize the conversion. The signal modulator Sigma-Delta ADC has the characteristics ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of complex circuit structure and long temperature conversion time, the present invention proposes a high-precision temperature sensor circuit and multiple calibration methods to reduce temperature measurement errors

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