ECG信号提取电路的实现及Multisim滤波仿真

针对心电信号微弱、低信噪比的特点,设计了一种由多级放大、逐级滤波等电路组成的信号提取系统,介绍了各级电路的设计原理,并对设计过程中涉及到的关键问题作了详细分析;同时对系统核心滤波电路作了Multisim仿真,结果说明其滤波效果较好;最后,由样机实测得到ECG信号,经与标准ECG对比,说明该电路能实现比较清晰、完整的ECG信号的提取,满足一定的设计要求,可作为ECG信号提取之用。

Implementation of ECG Signal Extraction Circuit and Multisim Filter Simulation

Aiming at the characteristics of weak ECG and low signal-to-noise ratio, a signal extraction system is designed, which is composed of multi-stage amplification and step-by-step filtering. The design principle of circuit at all levels is introduced, and the key problems involved in the design process are analyzed in detail. At the same time, the core filter circuit of the system is simulated by Multisim, and the results show that the filtering effect is good. Finally, the ECG signal is obtained from the prototype, and compared with the standard ECG, the ECG signal can be extracted clearly and completely, which can meet the design requirements and can be used as the ECG signal extraction.