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Wrong response in ADF4360-0

Question asked by Edel on Feb 6, 2014
Latest reply on Feb 20, 2014 by Edel

Hi. I´m trying to do a circuit that generates signals with frequencies between 2.4GHz and 2.725GHz. I´m using ADF4360-0.   Sometimes, the out frequency is right. It has no noise (figure 1).

IMG621.jpg

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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