Temperature sensor circuit with built-in clock

Abstract

The invention discloses a temperature sensor circuit with a built-in clock, which belongs to the technical field of electronic circuits. Firstly, a band-gap reference module is used to generate band-gap reference voltage and positive temperature coefficient voltage; then, two identical voltage frequency conversion circuits are used for converting the positive temperature coefficient voltage and the band-gap reference voltage to a positive temperature coefficient voltage frequency and a band-gap reference voltage frequency; and finally, counting is carried out through two counters, after full counting of the second counter, the first counter stops counting through feedback signals, and the size of a temperature value is acquired through acquiring the ratio of the positive temperature coefficient voltage to the band-gap reference voltage. The designed temperature sensor has a simple structure, and low power consumption can be achieved; a chopper operational amplifier is used in the band-gap reference module for eliminating errors caused by operational amplifier maladjustment, a system chopper module is added behind the band-gap reference module for reducing errors of comparator maladjustment voltage on temperature detection, the second counter generates first clock signal and second clock signal, and advantages of a wide frequency range, adjustable clock frequency and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a high-precision temperature sensor circuit with a built-in clock. 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 [0004] Sigma-De...

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Problems solved by technology

[0005] Aiming at the shortcomings of the above-mentioned circuit structure, such as complex structure and long temperature conversion time, the present invention proposes a temperature sensor circuit with a built-in clock, which can adjust the temperature resolution by adjusting the number of counters, and has the characteristics of simple structure and high precision; At the same time, a variety of calibration methods are proposed to reduce the temperature measurement error; in addition, the first clock signal f1 and the second clock signal clock can be provided inside the circuit, which has the advantages of wide frequency range and adjustable clock frequency.

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