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).
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).