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A high-precision temperature sensor without calibration

A temperature sensor, high-precision technology, used in thermometers, thermometers and instruments with directly sensitive electrical/magnetic components, etc., can solve the problems of increasing chip area and slow data output time, and achieves improved measurement accuracy and reduced time. Small mismatch error, the effect of reducing the error

Active Publication Date: 2019-12-27
CHIPSEA TECH SHENZHEN CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

Dynamic component matching technology needs to exchange current sources. Although it can reduce the error, it increases the chip area and slows down the data output time, which occupies too much ADC resources.

Method used

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  • A high-precision temperature sensor without calibration
  • A high-precision temperature sensor without calibration
  • A high-precision temperature sensor without calibration

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] The present invention proposes a high-precision temperature sensor that does not need to be corrected, and its circuit schematic diagram is as follows figure 2 As shown in the figure, the high-precision temperature sensor is composed of two parts. The first part of the circuit generates two accurate VBE voltages and a reference voltage VREF that does not vary with temperature. The second part of the circuit amplifies the VBE voltage through an amplifier and outputs TSVIP and TSVIN is sent to the ADC, and then by configuring different TS_TM, the ADC measures and averages separately to furthe...

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Abstract

The invention discloses a high precision temperature sensor requiring no calibration. The sensor herein is characterized in that the sensor is composed of two parts. The first part is for generating two accurate VBE voltages and a reference voltage VRER which does not change over temperature. The second part is for amplifying the VBE voltages through an amplifier, outputting a TSVIP and a TSVIN toan ADC, configuring TS_TM<1:0>, the ADC separately performing measurement, which further eliminates factors that cause the errors. The first part includes a bipolar transistor chopper operational amplifier, a current mirror circuit, a resistance dividing circuit and a RC filtering circuit. The second part is composed of amplifiers. According to the invention, the sensor herein can achieve +-1 DEGC temperature measurement without dependence on calibration, and can greatly increase the measurement precision of temperature sensors.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, in particular to the technology of an on-chip temperature sensor. Background technique [0002] With the improvement of integrated circuit process technology, the advent of the Internet of Things era and the unprecedented demand for portable electronic products, the system-on-chip continues to develop towards high frequency and high integration, which rapidly accelerates the increase in chip temperature, and temperature changes have a significant impact on chip performance. big impact. In order to avoid damage to the chip caused by excessive local temperature, a temperature sensor is needed to detect temperature changes in real time. [0003] There are two ways to realize the temperature sensor, on-chip and off-chip. Among them, the off-chip temperature sensor has the advantages of higher precision and accuracy, but it needs board-level devices to realize, which is not the low cost that m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/01
Inventor 陈培腾欧阳振华
Owner CHIPSEA TECH SHENZHEN CO LTD
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