AFE7901: Input impedance vs Frquency

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

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