基于Walsh函数的同时多频信号采集系统设计

Design of a multi-frequency-one-time signal acquisition system based on Walsh function

为获得不同组织、器官在同一时间不同频率下的阻抗值,设计了一套基于Walsh函数的同时多频信号数据采集系统。设计中选用AD9240作为A/D转换芯片,利用Cyclone IVEP4CE115F29C7N FPGA构造FIFO作为采样数据的缓存器,通过串口将FIFO中的数据传输到计算机进行波形的恢复。实验结果表明,系统能正确采集同时多频信号。

To acquire the impedance of different tissues and organs at the same time in different frequency, this paper designs a multi-frequency-one-time （MFOT） signal data acquisition system base on of Walsh function. In the design, AD9240 is selected as sampling ship, Cyclone IV EP4CEl15F29C7N FPGA is used to constructe FIFO as sampling data buffer. The data in the FIFO is transferred to the computer through the serial port to realize waveform recovery. Experimental results show that the data acquisi- tion system can acquire the multi-frequency-mixed signal correctly.