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Thread: Regarding BGB707L7ESD LNA

  1. #1
    Beginner Beginner nidhi is on a distinguished road
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    Regarding BGB707L7ESD LNA

    Hello support team,

    i am planning to use Bgb707l7esd in my project for satellite receiver.

    i have below query regarding this part number.

    As per the layer stacking information given from your end, we have below query.

    As layer stack up shows in application note (https://www.infineon.com/cms/en/prod...sd/#!documents) that it has top layer of rogers and bottom layer of FR4 for BGB707L7ESD,
    I want to use FR4 as both layers. Is it possible or it will effect the performance?


    Kindly request you to provide information as soon as possible.

    Thanks

  2. #2
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    Hello Nidhi,

    Thank you for posting on Infineon Forums.
    I will check internally about the performance of Bgb707l7esd with FR4 top layer and I will get to you as soon as I have an answer.

    Best regards,
    Pablo
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
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    Hello Nidhi,

    I discussed your concern with the author of the app note.
    This is the conclusion:

    Using FR4 for the top layer of the PCB instead of Rogers wouldn’t impact the performance of the LNA. You need to adjust the RF trace width(50-ohm microstrip line) according to the FR4 materials dielectric constant and the substrate height.

    I hope this satisfies your doubt.

    Let me know if you need anything else.
    Best regards,

    Pablo
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  4. #4
    Beginner Beginner nidhi is on a distinguished road
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    Hello Pablo,

    Thank you so much for your prompt reply.

    Can you please provide layer stack up for FR 4 material that will be help to calculate trace width and avoid iteration in design.

    Thanks

  5. #5
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    Hello Nidhi,

    As seen on the datasheet, there are three copper layers with two FR4 layers.
    Click image for larger version

Name:	LayerStackup.png
Views:	1
Size:	21.0 KB
ID:	5741

    If I misunderstood your question, please let me know.

    You can use any online tool like the following one to calculate the width.
    https://www.everythingrf.com/rf-calc...dth-calculator

    Best regards,
    Pablo
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  6. #6
    Beginner Beginner nidhi is on a distinguished road
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    Hello Support Team,


    we have one problem in fabrication. we are only capable of making a PCB in FR4 2 layer or 4 layer and herewith i have attached layer stackup for the same, Is it possible to have the same performance with the attached layer stack up.

    I have calculate the trace width for 50 ohm impedance :

    FR4 2 layer: 2.9mm
    FR4 4 layer: 0.31mm

    Kindly guide and verify regarding that. As per my understanding i have taken copper and prepag thickness in consideration please guide if i am wrong.

    waiting for your valuable support.

    Thannks
    ?????? ?????? FR4_2 LAYER STACKUP.PNG‎   FR4_4 LAYER_STACKUP.PNG‎  

  7. #7
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    Hello Nidhi,

    Please understand that this is the Power Mosfet forum and not an RF forum.
    Thus our knowledge of the subject is limited.
    I recommend you post in an RF community that can guide you with calculations.

    As far as your calculations are concerned, I see no problem.

    Best regards,
    Pablo
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  8. #8
    Beginner Beginner nidhi is on a distinguished road
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    Hello,

    Can you please share link of RF forum.
    we have search that but didn't get .


    Thanks

  9. #9
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    Hello Nidhi,

    By RF forum, I meant other communities on the internet, as Infineon does not have a dedicated RF sub-forum.
    If you have any other Infineon product-specific questions, you can always post on our forum.
    You can also post RF questions on our forum. However, have in mind that we do not have dedicated RF engineers on this forum.
    Therefore you would be relying on other forum users who may have RF experience.

    Best regards,
    Pablo
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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