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TLK4201 corrupted signal

tal tiko
Prodigy 110 points

Hi All,

I have a design with the following link:

Virtex 2 Pro Rocket IO (Aurora TX ) => Loopback => 5.6nF AC coupling => TLK4201 => 5.6nF AC coupling => Virtex 2 Pro (Aurora RX)

You can see the  signal at the input of the TLK4201 at: http://imageshack.com/a/img538/6388/WdBxuT.png

You can see the signal at the output of the TLK4201 at : http://imageshack.com/a/img661/1295/JozPgA.png


I can't understand why the signal gets so corrupted after going through the equalizer

Any one have an idea?

Thanks

  • 0
    TI__Genius 16150 points

    Hi Tal Tiko,

    If the value of AC coupling capacitor is too small, the capacitor could become fully charged or depleted during longer strings of consecutive 1’s or 0’s respectively.  This can cause bit errors because the data will not pass, and also because the common mode of the signals will change and causing the receiver to improperly sample the data.  Likewise, if the capacitor value is too large, it could cause bit errors by preventing the AC data to pass at higher data rate due to a slower charge constant.

    Generally the recommended value is 0.1uF in the applications.

    I hope this helps!

    Best Regards!

    Luis Omar Morán Serna

    High Speed Interface

    SWAT Team