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LMX2694-EP: 输出信号中有小数分频杂散该如何解决

Part Number: LMX2694-EP

大家好,如下图所示,输出的1GHz信号近端有小数分频杂散,后发现有的频点没有,有的频点会更多,小数分频的分子分母是计算出来可以正好输出1GHz整数频率;

相关配置:环路滤波器是用的参考设计中的,时钟单独测过没有杂散;

1.请问这类杂散和什么相关?

2.该如何消除?尝试过参考分频R,查看供电电源,修改小数分频分子分母(但输出就不是整数频率了也仍有杂散)

下面是寄存器配置:

下面是输出信号杂散: