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ADC12D1800RF使用DESCLKIQ模式时,在调节offset之后,DES Timing 几乎无法调节,可能出现的问题是什么?

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ADC12D1800RF使用DESCLKIQ模式时,在调节offset之后,DES Timing 几乎无法调节,输入时钟为1800MHz,测试信号为498M,幅值均为0dbm,对输出的结果做fft,它频谱图中出现804M,402M等杂散的可能的原因是什么?