摘要
由于弛豫铁电材料磁电传感器是微弱的高阻抗信号源,很容易给系统引入50Hz的强干扰信号,基于这一特点,设计了一款高共模抑制比(CMRR)的前端放大器集成电路。电路采用了适用于低电压工作的高输出阻抗CMOS电流镜结构以保证电路中电流镜的大输出摆幅和高输出阻抗;采用电流反馈放大器结构以获得高CMRR。仿真研究表明,该电路基本满足设计要求,性能优良。
The magnetoelectric sensors based on relaxor ferroelectric material show a high impedance,weak signal current,which can be strongly influnced by 50Hz disturbing signal.To solve this problem,we designed a high CMRR front-end amplifier integrated circuit.The high output resistance CMOS current mirror in the condition of low voltage operation was used to ensure high output swing and high output resistance.And current feedback was applied to get high CMRR.Simulations showed that the circuit has good performance,meeting the design requirements.
出处
《磁性材料及器件》
CSCD
北大核心
2010年第6期41-45,共5页
Journal of Magnetic Materials and Devices
基金
传感技术联合国家重点实验室基金资助项目(Skt0804)
南通市科技局2009AA科技创新计划(工业)资助项目(AA2009024)
关键词
弛豫铁电材料
磁电传感器
前端放大器
CMOS电流镜
电流反馈
relaxor ferroelectric material
magnetoelectric sensor
front-end amplifier integrated circuit
CMOS current mirror
current feedback technique
