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Original question:

AFE7950: AFE7950:Related to ADC and DAC Matching Networks

AFE7950: S11 Matching Nertworks

richard lejeune
Prodigy 130 points
Part Number: AFE7950

Hi, where can we find the recommended matching networks for the different bands.

  • +1
    TI__Genius 17831 points

    Hi Richard,

    In the AFE79xx secure folder you can download the 'AFE79xx_Matching' document for the matching circuits that we have designed and used.

    Regards,

    David Chaparro

  • 0 in reply to David Chaparro
    Prodigy 130 points

    Thank you David.

    My engineer will contact you.

    We assumed 100ohm ports for input and output ports. So we`ll have a problem with the output since we`re using 1:2 transformer.

  • 0 in reply to David Chaparro
    Prodigy 130 points

    One more thing. Is there any matching difference between ON and OFF state?

    I know its an odd question, and should be verifying S11 while ON, but our other test group did not notice any difference.

    I just want to make sure i can verify matching while OFF.

    If it needs to be ON, is it just powered or need to be fully running ?

    Richard.

  • +1 in reply to richard lejeune
    TI__Genius 17831 points

    Hi Richard,

    The first question was answered through email.

    In regards to your second question, the S11 measurements were done with the AFE powered and fully configured. We noticed that there was a difference in S11 between when the device is powered and not configured. Additionally note the S11 varies to some extent with DSA setting. S11 data for different DSA values is available in secure folder. I would recommend having the device powered and fully configured when you do your measurements. 

    Regards,

    David Chaparro