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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).

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

IMG622.jpg

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

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