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DS90UB960-Q1: 1.2G&1.6G RE Fail

KAI Nan
Prodigy 10 points

Part Number: DS90UB960-Q1

Tool/software:

We use the DS90UB960-Q1- to do the EMC Test test , 1.6G RE is fail : 1199.99MHz av -11.6dB ，1599.985 MHz is about -4.4dB,

we check the noise is from DS90UB960, any suggest for this ?

we use 8cell PCB,and the FPD-LINK III  IN Lev6

  • 0
    TI__Guru** 115050 points

    Hello Kai,

    RE performance is a system level performance not a device level. In order to pass, your layout, device and all other components should be designed/selected carefully.

    If you send me the schematic and layout Gerber files, then I can review and send my feedback.

  • 0 in reply to Hamzeh Jaradat
    Prodigy 10 points

    there is the same problem when i used the Ser DS90UB953, then i change to the AON Mode to slove the RE problem, is there the same Mode to reduece the noise?

    please share me you email and then i send the schemaitc and Layout

  • 0 in reply to KAI Nan
    TI__Guru** 115050 points

    What do you mean by "the same problem when I used the Ser DS90UB953". Are you measuring the UB960 or the UB953 as standalone device in the chamber? 

    You need to measure them as a link, SER + DES. If you use the devices in Synchrunous mode, the clock will be sent over the back channel from the UB960 to the UB953. But if you put the devices in non-Sync mode, and use the AON mode, the back-channel clock will not be sent from DES to SER. Maybe this is the problem.

    As a solution, you may use the link in non-Synch mode and use the AON mode. or

    Use the Synch mode but use an oscillator with SSC on the DES side, which should show improvements as well.