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The Spur performance of the AD9129 is bad

Question asked by TigerFish on Jul 31, 2015
Latest reply on Aug 19, 2015 by acwvh4

Now, I am using AD9129. The sample clock is 2.4GHz, and this clock is generated by ADF4350.

 

In order to test the performance of the AD9129, I generate a 600MHz signal, the output signal is as follow:

 

1.jpg

In the above figure, there are three signal: 600MHz, 1800MHz, 1200MHz

 

The power of the 1200MHz signal is bigger than the datasheet.

2.jpg

Why the spur performance can not achieve the best?

 

Thanks ,best wishes!

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