全定制心电采集的模拟集成电路设计

A Full Custom Analog IC for ECG Measurement

设计和实现了一种应用于健康监测设备的采集心电信号的模拟集成电路(IC)。该电路系统包括集成了右腿驱动电路的仪表放大器,二阶有源低通滤波器,第二级放大电路,高电源抑制比(PSRR)的低压差线性稳压电源(LDO)以及导联脱落检测电路。与其他已有的方案相比,该全定制模拟集成电路系统集成了工业级应用所需要的全部功能,并且表现出更好的共模抑制和电源抑制性能。芯片采用SMIC0.18μmCMOS工艺流片,且已完成测试,通过电极成功采集到人体心电信号。测试结果表明,该模拟IC实现了在0.5~100Hz带宽内51dB的增益,系统的共模抑制比和电源抑制比为75dB和90dB。在2.9V^5.5V电源电压下正常工作时,芯片消耗190μA的电流。

An analog IC applied to ECG monitoring devices has been presented in this paper. The system consists of instrumentation amplifier with driven-right-leg circuit, 2 nd active low pass filter, the second amplify stage, high power supply rejection ratio (PSRR) low dropout voltage regulator (LDO) and leadoff monitoring circuit. This chip has included all necessary functions for industrial applications. And it has high common mode rejection and power supply rejection performance. The design is fabricated with SMIC 0.18 μm CMOS process. And the measured results have demonstrated this chip’s functionalities. The gain of the mid-band is 51 dB. And the CMRR and PSRR achieve 75 dB and 90 dB. The IC consumes 190 μA currents with 2.9~5.5 V supply voltage.