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The Output of HMC836 Drop 7dBM After 2-3 Years Intermittent Working.

Hi, once I use HMC836 as a Local oscillator output 3.6GHz. The circuit schematic is designed following the evaluation board. There is no problem in the previous two years, and the output power is about 2dBm. After a few years, they are generally reduced to -5dBm. The output power requirements can't reached, and the overall circuit failure appears.

Do you have received any feedback in this regard. Do you have any repair measures besides replacing a new HMC836 chip? Thank you!