【经验】电子秤项目中共模抑制比导致的ADC输入精度不够问题如何解决？

时间： 2021-03-24 来源：世强

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某客户设计一款电子秤项目，ADC数模转换器驱动电路采用圣邦微电子的SGM8061 差分放大器搭建，在实际应用中发现共模抑制比CMRR较低，导致ADC输入精度不够，进而影响整个电子秤的测量精度，本文主要从电路的设计上分析如何解决该问题。客户应用电路如下：

理想情况下，差分放大器电路中的电阻应仔细选择，其比值应相同（R2/R1 = R4/R3）。这比值有任何偏差都将导致不良的共模误差。在本电子秤项目中，客户实际应用为所需增益G=1且使用容差为1%、匹配精度为2%的电阻产生的共模抑制比为：

在34dB时，CMRR_R相对较低。在这种情况下，即使放大器具有非常好的CMRR，也无法实现高精度，因为链路的精度总是取决于其精度最差的环节。因此，对于精密的测量电路而言，必须非常精确地选择电阻。

在实际应用中建议客户更换为1%精度，匹配精度0.005%的电阻，实际测试结果85.6dB，满足使用需求。

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本文由周宜龙提供，版权归世强硬创平台所有，非经授权，任何媒体、网站或个人不得转载，授权转载时须注明“来源：世强硬创平台”。

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SGMicro（圣邦微）-TI/ADI/ON产品对照表

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SGMICRO - 对照表代理服务技术支持批量订货

【IC】业界领先！圣邦微电子新品车规级电流检测芯片SGM8197xQ，支持-24至+105V共模输入电压

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2024-04-11 - 产品代理服务技术支持批量订货

SGMICRO放大器选型表

专用运算放大器，高输出电流400mA，低功耗1.1μA；高速运算放大器，500MHz增益带宽，高压摆率265V/μs；高精度运算放大器，失调电压低至5μV，低温漂0.011μV/℃；电流检测放大器，高共模电压105V，高共模抑制比140dB；低噪声运算放大器，低噪音1.6nV/√Hz，低失调电压8.5mV；微功耗运算放大器，最低功耗低至350nA，1\2\4路，轨至轨输入输出；低功耗运算放大器，功耗低至2.5μA，最大工作电压36V

选型表 - SGMICRO 立即选型

SGM8061/SGM8062/SGM8063 500MHz, Rail-to-Rail Output, CMOS Operational Amplifiers

型号- SGM8063XN6/TR,SGM8063XS/TR,SGM8061XN5/TR,SGM8061,SGM8062XMS/TR,SGM8062,SGM8063,SGM8062XS/TR,SGM8061XS/TR

JANUARY 2019 - SGMICRO - 数据手册 - REV. A. 2 代理服务技术支持批量订货查看更多版本

【视频】2023年4月20日电源管理新技术研讨会

思瑞浦、圣邦微、必易微等20余家厂商带来高频GaN芯片、32位ADC、RISC-V快充SoC等一站式电源管理新技术新产品。

2023-11-30 - 活动

【应用】圣邦微运算放大器SGM8270-2XS8G/TR助力FTU设计，有输出短路保护，具有低噪声、高精度等特性

FTU即馈线终端，是指安装在配电网馈线回路的柱上等处并具有遥信、遥测、遥控等功能的配电终端，圣邦微（SGMICRO）运算放大器SGM8270-2XS8G/TR优势：1、支持轨到轨输入和输出，并且有宽输入共模和差分电压范围；2、低偏移电压：2.8mV（最大）。

2022-09-09 - 应用方案代理服务技术支持批量订货

圣邦微高侧电流检测放大器SGM8196荣获2023全球电子成就奖“年度创新产品奖”

在刚刚落幕的“全球电子成就奖”颁奖典礼中，SGMICRO高压、高侧电流检测放大器SGM8196荣获“年度创新产品奖”。该器件单电源工作电压为2.7V至5.5V，还具有较宽的共模电压范围，设计用于将高压侧并联电阻上测得的小差分电压转换为参考GND的输出电压。

2023-11-07 - 产品代理服务技术支持批量订货

【应用】国产高速运算放大器SGM8061助力于激光测距仪设计，具有高带宽、高转换速率的特性

激光测距仪是利用调制激光的某个参数对目标的距离进行准确测定的仪器，工作光源采用905nm半导体激光二极管。其可广泛用于工业测控、户外、矿山、港口、航空、枪瞄、光电吊舱等领域。本文将推荐使用圣邦微的高速运算放大器SGM8061，助力于激光测距仪的设计。

2022-09-29 - 应用方案代理服务技术支持批量订货

【经验】运算放大器选型应用全攻略

运算放大器简称“运放”，是调节和放大模拟信号的器件，是多用于做模拟运算的放大器，主要特点是差分输入、单端输出、直流耦合，输入输出工作点都在0V。对于运算放大器，在实际电路中经常遇到供电方式的选择，运放好坏的测试以及如何测试运放的失调电压和偏置电流等问题，本文针对以上问题结合平时的设计经验进行了详细剖析。

2016-12-26 - 原厂动态代理服务技术支持批量订货