Sir,
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.
Sir,
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.
Sir,
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 stripline power divider and given to ADF4156 and LNA.When particular temperature window some mismatch happening and reflects the power from that point and it reduces overall power level.At that particular time ADF4156 is not getting sufficient level.Replaced LNA and solved the issue.
Thank you for the suggestions and feedback
Sir,
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 stripline power divider and given to ADF4156 and LNA.When particular temperature window some mismatch happening and reflects the power from that point and it reduces overall power level.At that particular time ADF4156 is not getting sufficient level.Replaced LNA and solved the issue.
Thank you for the suggestions and feedback
