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Thread: BGT24LTR11 maching structures

  1. #1
    Beginner Beginner unnabi is on a distinguished road
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    BGT24LTR11 maching structures

    What's the BGT24LTR11N16's output impedance on TX and RX ports? It does not specify numerical value anywhere in datasheets, only specify matching structure in AN472. However, that matching structure only works with 0.250 mm board thickness (10 mil). How do I match this IC to 20 mil thick board?

  2. #2
    Intermediate Intermediate
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    tinymanta is on a distinguished road
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    Hi unnabi,

    Here below the OUTPUT impedance of the TX and the RX port:

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    The matching should be evaluated with an RF simulator.
    Way of matching for the TX (24GHz) transformation can be done with a MS taper and a quarter wavelength transformation, or via a MS taper and a 50 Ohm line + distributed GND cap (dine in AN472)

    Cheers,
    Montassar.
    Last edited by tinymanta; Apr 23rd, 2019 at 05:43 AM.
    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
    New Member New Member Jhon is on a distinguished road
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    Dear Montassar:

    According to the matching structure for the TX and RX port in AN472 Fig13, I made a simulation with ADS. For the TX port, the ADS schematic is:

    Click image for larger version

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    The TX port-impedance calculated with zin is about 116 + j0 ohm, and RX is about 112+j34.5, which are quite different with the values in your post.

    What is the problem with my ADS model?

    Thanks,
    Jhon
    Last edited by Jhon; Jun 14th, 2019 at 11:27 PM.

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