Design of Low Offset Temperature Compensation Interface Circuit Based on Magnetic Sensor

FAN Hua; CHANG Weipeng; WANG Ce; LI Guo; LIU Jianming; LI Zonglin; WEI Qi; FENG Quanyuan

doi:10.11999/JEIT230601

Volume 46 Issue 4

Apr. 2024

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Article Navigation > Journal of Electronics & Information Technology > 2024 > 46(4): 1521-1528

FAN Hua, CHANG Weipeng, WANG Ce, LI Guo, LIU Jianming, LI Zonglin, WEI Qi, FENG Quanyuan. Design of Low Offset Temperature Compensation Interface Circuit Based on Magnetic Sensor[J]. Journal of Electronics & Information Technology, 2024, 46(4): 1521-1528. doi: 10.11999/JEIT230601

Citation:

FAN Hua, CHANG Weipeng, WANG Ce, LI Guo, LIU Jianming, LI Zonglin, WEI Qi, FENG Quanyuan. Design of Low Offset Temperature Compensation Interface Circuit Based on Magnetic Sensor[J]. Journal of Electronics & Information Technology, 2024, 46(4): 1521-1528. doi: 10.11999/JEIT230601

Citation:

FAN Hua, CHANG Weipeng, WANG Ce, LI Guo, LIU Jianming, LI Zonglin, WEI Qi, FENG Quanyuan. Design of Low Offset Temperature Compensation Interface Circuit Based on Magnetic Sensor[J]. Journal of Electronics & Information Technology, 2024, 46(4): 1521-1528. doi: 10.11999/JEIT230601

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Design of Low Offset Temperature Compensation Interface Circuit Based on Magnetic Sensor

doi: 10.11999/JEIT230601

FAN Hua^{1, 2, 3},
CHANG Weipeng²,
WANG Ce⁴,
LI Guo⁴,
LIU Jianming⁴,
LI Zonglin⁴,
WEI Qi^{5
,
,},
FENG Quanyuan⁶

1.
Chongqing Institute of Microelectronics Industry Technology, UESTC, Chongqing 401331, China
2.
School of Integrated Circuit Science and Engineering, University of Electronic Science And Technology of China, Chengdu 611731, China
3.
Guangdong Institute of Electronic Information Engineering, UESTC, Dongguan 523808, China
4.
Chengdu Sino Microelectronics Technology Co., Ltd., Chengdu 610041, China
5.
Department of Precision Instrument, Tsinghua University, Beijing 100084, China
6.
School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China

Funds: The National Natural Science Foundation of China (62371109, 62090012), The Natural Science Foundation of Chongqing (2022NSCQ-MSX5348), Fundamental Research Funds for the Central Universities (ZYGX2021YGLH203), Guangdong Basic and Applied Basic Research Foundation (2023A1515010041), Sichuan Provincial Science and Technology Plan (2022YFG0164)

Received Date: 2023-06-16
Rev Recd Date: 2023-09-22

Available Online: 2023-09-28

Publish Date: 2024-04-24

Abstract

Abstract

Considering the widespread application of magnetic sensors in the Internet of Things (IoT), a Hall sensor readout interface circuit with low offset voltage and low-temperature drift characteristics based on a 180 nm CMOS process is designed in this work. In response to the temperature drift characteristic of the Hall sensor sensitivity, a temperature sensing circuit that is combined with the table lookup method to adjust the gain of the Programmable Gain Amplifier (PGA) is designed, which effectively reduces the Temperature Coefficient (TC) of the Hall sensor. On this basis, the offset voltage of the Hall sensor is greatly eliminated by the use of Correlated Double Sampling (CDS) technology in the main signal channel. The simulation results show that the TC of the Hall sensor is decreased from 966.4 ppm/°C to 58.1 ppm/°C in the temperature range of –40°C～125°C. The chip measurement results of the main signal channel show that the offset voltage of the Hall sensor is reduced from about 25 mV to about 4 mV and the nonlinear error of the Hall sensor is 0.50%, which occupies an active area of 0.69 mm².
- Hall sensor,
- Readout interface circuit,
- Temperature compensation,
- Low offset voltage

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References(20)

References

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