低噪声线性霍尔传感器读出电路设计  

Design of the Read-out IC for Linear Hall Sensor

作　　者：张小燕 魏榕山[1] ZHANG Xiao-yan;WEI Rong-shan(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福州大学物理与信息工程学院

出　　处：《中国集成电路》2019年第6期33-37,共5页China lntegrated Circuit

基　　金：福建省自然科学基金(2018J 01803)

摘　　要：基于斩波技术和旋转电流技术,设计了一款低噪声、高精度的线性霍尔传感器读出电路。在传统斩波仪表放大器的基础上,引入开关电容陷波滤波器和PTAT(Proportional To Absolute Temperature)电流补偿技术,实现了低纹波、低噪声和低温漂。采用SMIC 0.18μm CMOS工艺,在电源电压为3.6V,斩波频率为250kHz下,对所设计的电路进行仿真验证。通过Spectre仿真,电路-3dB带宽为11.5kHz,纹波抑制比为39.6dB,输入等效参考噪声功率谱密度PSD为15.4nV/√Hz,非线性均在0.5%以内,整体电路能在-40℃至150℃温度范围内精确而稳定的工作。Based on chopping technology and spinning-current technology,a low noise,high precision linear Hall sensor readout circuit is designed.Based on the traditional chopper instrumentation amplifier,the switched capacitor notch filter and PTAT(Proportional To Absolute Temperature)current compensation technology are introduced to achieve low ripple,low noise and low temperature drift.The SMIC 0.18μm CMOS process was used to verify the designed circuit at a power supply voltage of 3.6V and a chopping frequency of 250kHz.Through Spectre simulation,the circuit has a-3dB bandwidth of 11.5kHz,the ripple rejection ratio of 39.6dB,the input-referred noise power spectral density(PSD)of 15.4nV/√Hz,and the non-linearity is within 0.5%.The overall circuit can operate accurately and stably over the temperature range of-40℃to 150℃.

关 键 词：线性霍尔传感器 旋转电流技术 斩波技术 陷波滤波器 PTAT电流补偿 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]