利用右腿驱动技术的心电信号模拟前端设计

ECG front-end subsystem with the driven-right-leg circuit

在非屏蔽室条件下,心电信号检测是在强共模干扰下的微弱信号检测过程,为提高心电信号的检测效果,常采用右腿驱动电路来抑制电路的工模干扰.设计了一种高性能的心电信号检测放大器,将可编程增益放大电路及右腿驱动电路结合应用于模拟前端部分.可编程增益放大器采用AB类缓冲器结构,用于将心电信号检测信号放大,其可编程放大倍数为1,2,3,4,6,8,12,其共模抑制比可达129dB,有效消除了共模干扰.

Under the condition of an un-shielding room, electrocardiogram （ECG） signal detection is a weak signal detection process with a strong common mode interference. In order to improve the performance of common mode rejection of the circuit, a driven-right-leg （DRL） circuit is often utilized. In this paper, a high performance ECG amplifier is proposed. The programmable gain amplifier （PGA） circuit and DRL circuit are applied at this analog front end. The PGA is utilized for ECG signal amplification, with the programmable gain set at 1, 2, 3, 4, 6, 8, 12. The DRL circuit is used to reduce common-mode interference.