Pls help to find an unlocking issue in PLL ckt using AD4156 and HMC587 VCO.It became unlock b/w the temperature range of +17 to +20 C.Freq is 5.5GHZ.It is working fine above and below this range.
Finally I could find out the problem.The pad of LNA detached (very very small portion) from the body.The image attached is taken using a magnifier having 110 zoom.HMC 587 output is divided using…
The HMC587 output range is 5 - 10 GHz. It sounds strange that you are getting 3 - 8 GHz from it. Can you share a schematic, loop filter configuration, and register settings?