表面肌电信号前端处理电路与采集系统设计

Surface EMG Preamplifier and Data Acquisition System

针对表面肌电信号幅度小、信噪比低、易受干扰、准确获取困难的问题,设计了高共模抑制比的前端放大电路,有效地抑制了共模干扰。采用EZ-USBFX2的slave FIFO模式的数字电路构成了基于USB2.0的8路高速采集与传送系统,各路信号的最大同步时间差不超过1ms。编写了可在普通PC机上运行的上位机读USB口数据程序,在上位机上得到了实时、完整、准确的肌电信号,为肌电信号处理、分析和应用提供了可靠的数据基础。

The high CMRR preamplifier is designed to deal with the difficulties in capturing the sEMG signal. It is a small range, low SNR and easily to be disturbed signal, The digital circuit using the slave FIFO mode of EZ-USB FX2 make up of a high speed col- lection and transmission system based on USB 2.0. The time of interval among channels is less than 1 ms. The code to read the data through USB port from the upper computer to PC has realized to get the real-time sEMG signal. This is the foundation for sEMG signal analyzing and application.