一种低噪声可编程斩波电流反馈仪表放大器  

A Low-Noise Programmable Chopper Current-Feedback Instrumentation Amplifier

作　　者：王群虎 辛晓宁[1] 任建[1] 陈疆川 WANG Qunhu;XIN Xiaoning;REN Jian;CHEN Jiangchuan(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110870

出　　处：《微处理机》2024年第3期13-16,42,共5页Microprocessors

摘　　要：针对应用于Sensor AFE的可编程增益仪表放大器的低频噪声干扰问题,设计一款低噪声可编程增益斩波电流反馈仪表放大器。该设计采用斩波技术实现对以1/f噪声为代表的低频噪声的抑制。在设计中加入数模转化器,通过电流叠加的方式实现对传感器失调的补偿,解决由传感器失调导致仪表放大器性能下降的问题。采用可编程电阻网络,实现可编程增益放大,提升仪表放大器的通用能力。仪表放大器基于TSMC 0.18μm工艺,供电电压为2.7~3.6 V,通过调节电阻网络,实现16~2048倍放大,另外在传感器失调补偿范围和等效输入参考噪声参数上也较为理想。To address the low-frequency noise interference issue in programmable gain instrumentation amplifiers(IAs)for sensor AFEs,a low-noise programmable gain chopper current-feedback IA is designed.The design employs chopper technology to suppress low-frequency noise,exemplified by 1/f noise.A digital-to-analog converter(DAC)is incorporated to implement sensor offset compensation using current stacking,resolving the issue of performance degradation caused by sensor offset.A programmable resistor network is employed to achieve programmable gain amplification,enhancing the IA's versatility.The IA is based on TSMC's 0.18μm process,with a supply voltage of 2.7~3.6 V.By adjusting the resistor network,a gain of 16~2048 can be achieved.Additionally,it is also ideal in sensor offset compensation range and equivalent input reference noise parameters.

关 键 词：仪表放大器 斩波 低噪声 失调补偿 

分 类 号：TN402[电子电信—微电子学与固体电子学]