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the ADF4351 frequency problem

Question asked by XingLi on Apr 20, 2018

When testing the frequency of ADF4351, the output power is set to 5dBm, the frequency is 1.7GHz, and the spectrum of the following image appears.

The left and right ends are stray, and the power is large.But when I reduce the output power, this situation is gone. As shown in the figure, why?