小弟最近使用AD9854芯片，根据手册上的电路原理图，手工做了一个PCB板，主要参数：外部时钟30MHz有源晶振单端输入，内部PLL倍频到270MHz，控制信号输出频率为40MHz，但是输出信号确包含其他频率的杂散信号，示波器测量信号如下图所示，
1、从图可以看出信号包含240MHz信号和300MHz信号（估计是时钟的干扰），问这两个信号如何产生，如何解决？
2、输出信号的80MHz杂散要不要去除，（频谱上不是很明显）
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