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DS125BR820: Before entering DS125BR820 signal had decay -14dB, how many dB can DS125BR820 recover?

PYTsai
Genius 11970 points
Part Number: DS125BR820


Hi 

One quick question. 

Before entering DS125BR820 signal had decay -14dB, how many dB can DS125BR820 recover?

Thanks!

PY Tsai

  • 0
    TI__Mastermind 43795 points
    The DS125BR820 is capable of ~10dB of signal compensation in the 8-12 Gbps range.
    Regards,
    Lee
  • 0 in reply to Lee Sledjeski
    TI__Genius 11970 points
    Lee,

    If the signal is -20dB decay, can i use two DS125BR820 in serial to compensate 20dB?

    thanks!

    PY Tsai
  • 0 in reply to PYTsai
    TI__Mastermind 43795 points

    Hi PY,

    The DS125BR820 is designed to be a part of the overall link compensation.  For PCIe links I recommend to keep the total channel loss between the system Tx and Rx at < 32 dB @ 4GHz. Under this condition the DS125BR820 is responsible for 10 dB and the PCIe system components are designed to handle the other 22 dB.

    For links extending beyond 32 dB it is possible to daisy chain DS125BR820 devices together for additional compensation.  This technique carries risk since the overall link attenuation is quite high and just a little crosstalk/noise can significantly degrade the system margin and result in bit errors or poor system performance.  For this reason we recommend to keep link attenuation below 32 dB and use only a single DS125BR820 equalizer in the channel.

    Regards,

    Lee