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Noise in output stage of adf4360-0

Question asked by Edel on Feb 6, 2014

Hi, I made a new electric diagram for my Synthesizer. The power of out signal  is better. Sometimes, the out frequency is right. It has no noise (figure 1).


But, in other cases, the out frequency is wrong. It has noise (figure 2).


What can I do for better the circuit? Must the filter, voltage sources (AVdd, DVdd), reference oscillator and the rest of components be as close as possible  of the ADF 4360-0? I used grounded coplaner traces with a characteristic impedance of 50 ohmns (figure 3).

microstrip de placa.jpg

Best Regards