能完全模拟DDS芯片的工作，在CPLD的输出引脚后接上相应的D/A转换芯片并接上低通滤波器，将得到非常好的正旋波-To fully simulate the work of DDS chip in after the CPLD output pin connected to the corresponding D/A conversion chip and connected to low-pass filter, will be a very good spin wave is