By analyzing the control of AD sampling sequence,a sampling system is designed,in which the sampling rate is decided by the input square-wave frequency and the sampling channel number is set by a register in CPLD.

• 结合分析AD采样时序的控制,设计出了采样频率由输入方波频率决定,采样通道数由CPLD寄存器设定的采样系统。