摘要
采用SMIC 0.18μm CMOS工艺,设计了一种应用于无线心电图检测系统的5阶Gm-C巴特沃斯低通滤波器,滤波器的综合采用流图法模拟无源LC梯形网络结构。基于MOS晶体管的亚阈值导电性以及源级负反馈的线性化技术,设计了一种低功耗、高线性的OTA。仿真结果显示,滤波器-3dB截止频率为256Hz,当输入频率为100 Hz,Vpp为100mV的正弦信号时,滤波器3阶谐波失真为-56.91dB,阻带衰减率达到99.77dB/dec,静态功耗为0.8mW。
A 5th order Butterworth Gm-C low pass filter （LPF） for wireless electrocardiogram （ECG） detection system was designed based on the SMIC 0. 18μm CMOS process. A passive LC ladder filter was emulated with the signal flow graph （SFG） method. As a key building block for the filter, a low power high linear operational transconductance amplifier （OTA） was designed based on MOSFET＇s subthreshold conductive characteristics and the source negative feedback linearization technique. The simulation results showed that the --3 dB cut-off frequency of the filter was 256 Hz. The third order harmonic distortion was --56.91 dB when the input was applied to a sine signal with a peak of 100 mV and a frequency of 100 Hz. Meanwhile, the stop band attenuation of the filter reached 99.77 dB/dec, and the total power consumption was 0.8 mW.
出处
《微电子学》
CAS
CSCD
北大核心
2015年第4期525-528,532,共5页
Microelectronics
基金
福建省科技厅重点项目(2013H0026)
福建省教育厅资助项目(JA12029)
