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Reduce Return losses S11 ADL8142

Thread Summary

The user inquired about reducing the S11 parameter of the ADL8142 from -10.5 dB to -15 dB during the design phase. The support engineer explained that S11 is governed by the device's internal matching and suggested using the datasheet plots for S11 performance over Vdd and Idq to optimize the parameter. Broadband S11 better than -15 dB is unlikely achievable through external matching or PCB layout changes.
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Category: Hardware

Hi

I'm in the designing phase with the ADL8142 and was curious of what would be an ideal way of reducing the S11 of this device form the -10.5 dB to say something like -15 dB? Layout or matching network?

Thanks in advance

  • Hi Joshua,
    S11 is from the device itself since it's internally matched. 
    The datasheet has plots for S11 performance over Vdd and Idq, which can be used to attain the best  S11 for the frequencies of interest.
    S11 better than -15dB broadband with external matching, or PCB layout is likely not achievable since it's the device itself that's governing this spec.    

    Best Regards,
    Chris 

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