A Chopper Stabilized Pre-amplifier for Magnetic Sensor

摘要：

This paper introduced chopping principle and presented a design of chopper stabilized preamplifier for magnetic sensor. Compared with autozeroing technique,chopping technique does not fold noise to DC and the noise performance is better. This chopper stabilized pre-amplifier used the integrated instrumentation amplifier AD620 as the main amplifier. It achieved low voltage noise about 10nV/VHz,and the corner frequency of 1/f noise about 1.5mHz. Residual offset caused by nonidealities of CMOS switch was reduced by a delayed demodulate clock. And the measured result was found to agree well with the simulated result.

关键词： chopper stabilized 1/f noise pre-amplifier magnetic sensor

作者: Zhao Jing Zhang Shuang Chen Shudong

作者单位: College of Electronic Science and Engineering,Jilin University,China College of Instrumentation and Electrical Engineering,Jilin University,China

会议类型: 国际会议

会议名称: 2011 International Conference on Opto-Electronics Engineering and Information Science(2011光电电子工程与信息科学国际会议 ICOEIS 2011)

会议地点: 西安

会议语种:英文

页码: 2392-2395

在线出版日期: 2011-12-23（万方平台首次上网日期，不代表论文的发表时间）