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AFE7901: Input impedance vs Frquency

Maor Bouhadana
Prodigy 70 points
Part Number: AFE7901
Other Parts Discussed in Thread: AFE7900

Tool/software:

Hi, I'm willing to use the AFE from 400 - 6000MHz with the same port so I'm dealing with wideband impedance matching. I'm looking for a measurement \ documentation of the input impedance ( real and imaginary ) of each port. from the s1p you supplied in one of the folders, it seems like the input impedance is extremely varied, suggesting a narrow-band impedance matching.

can you help me figure it out so I can implement wideband matching? as well for the tx chain

  • 0
    TI__Expert 4955 points

    Hi Maor,

    Our suggestion would be to first find the balun you plan to use. Then start with a quick simulation using the S parameters to give you a starting point of how the components will affect the S11 of the circuit. And then you would be able to put it in the board to start tweaking the network to optimize based on what you see from S parameter measurements and the loss of your matching circuit.

    From doing matching networks in a different product, we saw the layout parasitics will also have an impact on the performance of your matching network considerably at higher frequencies because the terminations on the RF channels are sensitive. For such a wide band match, some resistive components might also be useful in order to shrink the response in the smith chart closer to 50Ohms.

    Best,

    Camilo

  • 0 in reply to Camilo Garcia Trujillo
    Prodigy 70 points

    Hi Camilo, can you give me the official sNp file of the AFE? I will try to simulate it and I will see how it goes.

  • 0 in reply to Maor Bouhadana
    TI__Expert 4955 points

    Hi Maor,

    The S parameters for the AFE7900 are in the OneRelease inside Simulatio_Models.zip, which can be accessed by the link below:

    https://www.ti.com/secureresources/AFE79XX-HSC-DESIGN 

    Best,

    Camilo