一种低功耗心电信号采集模拟前端电路

A Low Power Analog Front-End Circuit for ECG Signal Acquisition

设计了一种采用通道复用技术的低功耗心电信号采集电路。该电路由多通路数据选择电路、前置放大器、缓冲器和G_m-C低通滤波器组成。多通路数据选择电路中的开关采用栅压自举型开关结构,提高了线性度。该采集电路基于0.18μm CMOS工艺进行设计与仿真。仿真结果表明,静态电流仅为5μA,增益为46 dB,带宽为39 mHz^19 kHz,开关的切换频率为10 kHz。该采集电路能实现多导联心电信号的采集。

A low power analog front-end(AFE)circuit for ECG signal acquisition was presented by adopting channel multiplexing technology.The designed AFE circuit consisted of a multi-path data selection circuit,a preamplifier,a buffer and a G_m-C low-pass filter.The switch in the multi-path data selection circuit adopted a gate-voltage bootstrap type switch structure to improve the linearity.The circuit was designed and simulated in a 0.18μm CMOS process.The simulation results showed that the circuit only consumed 5μA quiescent current and gave a 46 dB gain in the band from 39 mHz to 19 kHz with the switching frequency of the switch was 10 kHz.It could realize the acquisition of multi-lead ECG signals.