摘要
采用斩波稳定技术设计了一款低噪声CMOS放大器.该放大器用于神经信号的检测和放大,包括调制解调器、rail-to-rail输入放大级、带通滤波器、低通滤波器和振荡器5个模块.其中,rail-to-rail输入放大级提高了电路的输入共模范围,带通滤波器减小了残余失调,整个斩波稳定系统使电路显现低噪声特性.该电路采用TSMC 0.35μm CMOS工艺进行了仿真流片设计,低频等效输入相关噪声谱密度为13.2 nV/sqrt(Hz),开环增益为100 dB,3 dB带宽10 kHz,芯片面积为980μm×450μm.仿真结果显示,基于斩波稳态技术的低噪声放大器可作为一种有效的神经信号检测的前端电路.
A low noise CMOS amplifier used in the detection and the amplification of Extraeellular neural signals （ENG） is presented. By utilizing the design method of Chopper stabilization （CHS）, the proposed amplifier achieves low noise characteristic. Besides, it can achieve rail-to-rail input and has low residual offset. The proposed amplifier chip has been implemented by using the 0.35μm CMOS process of TSMC with die area of 980μm ×450μm. The simulation results show that the low noise amplifier features a open loop gain of 100 dB and a bandwidth of 10 kHz. The equivalent input noise is about 13.2 nV/sqrt（Hz）. The simulation results show that the low noise amplifier based on chopper stabilization is a potent analog front end.
出处
《江南大学学报（自然科学版）》
CAS
2008年第6期665-670,共6页
Joural of Jiangnan University (Natural Science Edition)
基金
浙江省重点科技计划项目(2007C2102)
关键词
斩波稳定技术
轨到轨放大器
低噪声放大器
神经信号检测
chopper stabilization（CHS）
rail-to-rail amplifier
low noise amplifier
the detection of extracellular neural signals （ENG）
