%0 Journal Article
%T 应用于眼压信号检测的低噪声前置放大器设计
%A 曾健平
%A 樊明
%A 陈铖颖
%A 张锋
%J 湖南大学学报(自然科学版)
%D 2017
%X 基于SMIC 180 nm CMOS工艺，设计并实现了一款应用于眼压信号检测系统的低噪声前置放大器.该放大器使用二极管连接的MOS管实现GΩ级别的大电阻，在反馈回路中该伪电阻与反馈电容并联在低频段产生高通截止点以抑制直流失调电压和低频噪声，达到较好的噪声性能.后仿真结果显示：低噪声前置放大器的直流增益为40 dB,有效带宽从0.25 Hz到46 kHz，在低频频率100 Hz处的等效输入噪声为197.3 nVrms，采用1.8 V的电压供电，核心电路功耗为32.4 μW，芯片面积为0.75 mm×0.62 mm.</br>A low-noise preamplifier applied to the intraocular pressure signal-detection system with 180 nm CMOS process was proposed.The amplifier adopts a diode-connected MOS transistor to achieve a large resistance of GΩ level.In the feedback loop,the pseudo-resistor and the feedback capacitor are connected in parallel to generate a high-pass cutoff point in the low frequency,which can suppress the DC-offset voltage and the noise in low frequency to achieve better noise performance.The post-simulation results show that the low noise preamplifier has a DC-gain of 40 dB,the effective bandwidth is from 0.25 Hz to 46 kHz,and an equivalent input noise is 197.3 nVrms at 100 Hz.The power consumption of the core circuit is 32.4 μW at a supply of 1.8 V,and the chip area is 0.75 mm×0.62 mm.
%K 信号检测 伪电阻 低噪声 放大器&lt
%K /br&gt
%K signal-detection pseudo-resistor low noise preamplifier
%U http://hdxbzkb.cnjournals.net/ch/reader/view_abstract.aspx?file_no=20170817&flag=1