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HMC903, HMC347A, HMC1082 and HMC797: About phase variation in same wafer lot

Thread Summary

The user inquired about the phase variation of HMC903LP3E, HMC347ALP3E, HMC1082LP4E, and HMC797AMP5E on the same wafer lot, aiming for a phase variation of ±7 degrees before input to the combiner. The engineer responded that typical part-to-part variance is around 17 degrees, which is common for GaAs devices, and that Analog Devices does not support production screening for phase. Calibration is recommended to address phase variations in phased array systems.
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Category: Hardware
Product Number: HMC903LP3E

Hi,

Please see the attached block diagram.

The customer wants to know the phase variation on the same wafer lot about HMC903LP3E, HMC347ALP3E, HMC1082LP4E and HMC797AMP5E.

Because he uses above products in below blocks and their phase variations should be each other A to D line within ±7 degree before input the conbiner.

Coudl you tell me the phase variation on the same wafer lot about HMC903LP3E, HMC347ALP3E, HMC1082LP4E and HMC797AMP5E?

And can he order those parts with selected phase variation?

Best Regards,

Tomohiro

  • Hi Tomohiro-San,

    I understand what you are trying to do. The goal is to have a system that does not need calibration which has a certain defined phase variation (+/-7 deg). I looked at a small dataset for just one part and see already 17 degrees of part to part variance (all material from one lot). This is typical for GaAs devices and processes. In general, phased array systems like this need to be calibrated to take account for part-to-part variances. 

    Also, we do not support production screening of devices for phase.

    Best Regards

    Eamon  

  • Hi Eamon-san,

    Thank you for prompt answer.

    Your support is always great help for me.

    Probably, the customer will design to adjust phase around 30 deg.

    He needed design to adjust phase 360 deg if it is no information from you.

    Best Regards,

    Tomohiro