一种高CMRR低功耗生物电信号采集前端放大器
发布时间：2018-10-21 15:58
【摘要】：设计了一种应用于生物电信号采集的前端放大器。采用间接电流反馈技术,提高了放大器的线性度和共模抑制比。采用负反馈环路,消除了采集过程中电极产生的极化电压。采用0.18μm混合信号CMOS工艺对电路进行设计,使用Cadence Spectre进行了仿真。结果表明,该电路在3V供电下消耗的静态电流为4.5μA,在0.3Hz~1.3kHz的增益带宽内增益为37dB,能够消除50mV的极化电压,共模抑制比为98dB(50Hz工频处),噪声效率因子为11.5。
[Abstract]:A front-end amplifier for bioelectric signal acquisition is designed. The linearity and common-mode rejection ratio of the amplifier are improved by using indirect current feedback technique. A negative feedback loop is used to eliminate the polarization voltage generated by the electrode during the acquisition process. The circuit is designed by using 0.18 渭 m mixed signal CMOS process and simulated by Cadence Spectre. The results show that the static current consumption is 4.5 渭 A and the gain in the gain bandwidth of 0.3Hz~1.3kHz is 37 dB, which can eliminate the polarization voltage of 50mV. The common-mode rejection ratio is 98dB (50Hz power frequency), and the noise efficiency factor is 11.5.
【作者单位】： 华中科技大学光学与电子信息学院;
【分类号】：TN722
本文编号：2285614
[Abstract]:A front-end amplifier for bioelectric signal acquisition is designed. The linearity and common-mode rejection ratio of the amplifier are improved by using indirect current feedback technique. A negative feedback loop is used to eliminate the polarization voltage generated by the electrode during the acquisition process. The circuit is designed by using 0.18 渭 m mixed signal CMOS process and simulated by Cadence Spectre. The results show that the static current consumption is 4.5 渭 A and the gain in the gain bandwidth of 0.3Hz~1.3kHz is 37 dB, which can eliminate the polarization voltage of 50mV. The common-mode rejection ratio is 98dB (50Hz power frequency), and the noise efficiency factor is 11.5.
【作者单位】： 华中科技大学光学与电子信息学院;
【分类号】：TN722
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