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AD9361 image interference and harmonic interference

Question asked by Tyrant98 on Sep 8, 2017
Latest reply on Sep 8, 2017 by Tyrant98

I use the DDS to produce all the 1MHz cos and a sin signal through the digital data interface in the CMOS mode passed to the AD9361, AD9361 launch of the local oscillator frequency is 2290MHz, in the spectrum analyzer to see the mirror is not suppressed, and harmonic Interference is very serious, but the use of 9361 internal BIST register to see the launch part of the suppression is very good, I do not know what the reason is the timing of the interface problems or register configuration problems? The drawings are mirrors and harmonics seen on the spectrum analyzer.

我用DDS产生均为1MHz的一路cos和一路sin信号通过数字数据接口在CMOS模式下传给AD9361,AD9361发射的本振频率是2290MHz,在频谱仪上看到镜像完全没有被抑制,且谐波干扰很严重,但是使用9361内部的BIST寄存器查看发射部分抑制的很好,不知是什么原因,是接口的时序有问题还是寄存器配置有问题?附图是频谱仪上看到的镜像和谐波。

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