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高速AD加上时钟后,输入信号会有一个两倍于时钟信号的毛刺产生。请问这是什么原因?

Other Parts Discussed in Thread: ADS807, OPA656

高速AD使用的的ADS807,时钟信号由信号源给4M方波信号。加上时钟信号后,测AD输入信号会有一个大约8MHZ的毛刺。更换时钟频率后同样输入信号会有一个两倍于时钟信号的毛刺