High-precision temperature sensor circuit

Abstract

The invention discloses a high-precision temperature sensor circuit and belongs to the technical field of electronic circuits. Firstly, a bandgap reference module is utilized to generate a bandgap reference voltage and a positive temperature coefficient voltage; then, two identical voltage-to-frequency conversion circuits are used to convert the positive temperature coefficient voltage and the bandgap reference voltage into a positive temperature coefficient voltage frequency and a bandgap reference voltage frequency, respectively; finally, two counters are used to count; and after a second counter is full, the first counter stops counting by a feedback signal, and a temperature value is obtained by obtaining a ratio of the positive temperature coefficient voltage to the bandgap referencevoltage. The designed temperature sensor has a simple structure and can realize low power consumption; a chopper operational amplifier is used in the bandgap reference module to eliminate an error caused by offset of an operational amplifier; a system chopper module is added behind the bandgap reference module to reduce a temperature detection error caused by a comparator offset voltage; and the high-precision temperature sensor circuit provided by 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

Images