一种用于神经信号检测的低压前馈补偿运算跨导放大器  

A Low-Voltage Feed-forward Compensated Operational Transconductance Amplifier for Neural Signal Recording

作　　者：梁帮立[1] 王志功[1] 王余峰[1] 吕晓迎[2] 章丽[1] 熊明珍[1] 

机构地区：[1]东南大学射频与光电集成电路研究所,南京210096 [2]东南大学生物科学与医学工程系,南京210096

出　　处：《中国生物医学工程学报》2006年第2期192-196,201,共6页Chinese Journal of Biomedical Engineering

基　　金：国家自然科学基金资助项目(69825101);国家自然科学基金重大研究计划重点资助项目(90377013)

摘　　要：采用CSMC0·6μmCMOS工艺设计实现了低压、低功耗的多级运算跨导放大器。本设计引入了无密勒电容的前馈补偿技术,规避了芯片集成电容以降低噪声并减小成本,获得了高达630MHz的单位增益带宽以及79度裕度的高稳定性。电路工作于2·5V±1·25V),功耗16mW,开环直流增益85dB,3dB带宽116kHz,可基本满足神经信号检测的应用要求。A low-voltage low-power operational transconductance amplifier has been realized in CSMC＇s 0.6μm CMOS technology. To decrease the noise, the power consumption and the chip size, a robust feed-forward compensation scheme was introduced to eliminate the on-chip Miller capacitance. The amplifier had a gain-bandwidth of 630MHz and a phase margin of 79°. The amplifier could operate under 2.5V（±1.25V） with a power consumption of 16mW, achieving a DC gain of 85dB and a 3dB-bandwidth of 116 kHz. On-wafer test showed that the amplifier had the potential of applying in neural signal recording.

关 键 词：神经信号检测 运算跨导放大器 前馈补偿 CMOS工艺 

分 类 号：TN432[电子电信—微电子学与固体电子学] Q424[生物学—神经生物学]