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TRF3704输出问题

Other Parts Discussed in Thread: TRF370417, DAC5688

在用TRF370417这个IQ调制器时,输入采用DAC5688作为中频信号,测试输出RF信号的频谱发现,在约为LO频率上的RF信号频谱会抖动,且频谱分量没有2倍的LO频率上的分量来的多。。。当改变DAC5688的输出时,发现RF信号的波动也会随着改变,请问有没有什么可能的方案或者原因