I have trouble using the HMC767. I have built my own circuit based on the evaluation board (see attached file) but I cant get it to work. It wont lock to the programmed frequency which is 9025 MHz. Instead I measure a frequency between 9.9-10 GHz. When I measure the charge pump pin and Vtune pin I get approximately 150 mV and 14 V respectively. I measure a 50 MHz 2.6 Vpp sinusoidal reference.
I have tried to program the registers in many different ways but nothing seems to work. In the last attempt I used an example found here (see attached file), but it did not help. I think I have programmed the unit because I can read back from the registers the same values I put in.
What could be the problem? Any help would be much appreciated.