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Visitor
Visitor
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Registered: ‎12-17-2019

Decoupling Capacitor for MGT of Kintex

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To whom it may concern,

Does Kintex-7 FBG676 package has discrete substrate decoupling capacitors for MGT power supplies?

If that is the case, can I avoid the decoupling capacitors for MGTAVTT, MGTAVCC and MGTVCCAUX on PCB?

Thanks

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Xilinx Employee
Xilinx Employee
312 Views
Registered: ‎08-25-2010

回复: Decoupling Capacitor for MGT of Kintex

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Hi @serm_wang 

Those substrate package capacitors is helping maintain a low impedance, high-frequency path between power supply and ground, and noise attenuation in the package   

Thanks
Simon
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Xilinx Employee
Xilinx Employee
329 Views
Registered: ‎08-25-2010

回复: Decoupling Capacitor for MGT of Kintex

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Hi @serm_wang 

Yes, it has, but PCB capacitors are recommended to provide noise isolation between the transceiver power supply pins and the external noise sources, table 5-6:

https://www.xilinx.com/support/documentation/user_guides/ug476_7Series_Transceivers.pdf

 

Thanks
Simon
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Visitor
Visitor
318 Views
Registered: ‎12-17-2019

回复: Decoupling Capacitor for MGT of Kintex

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Hi Simon,

Thank you for your prompt response.

There are quite a few decoupling capacitors on substrate of FB package, what is the purpose for those discrete substrate decoupling capacitors?

Thanks

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Highlighted
Xilinx Employee
Xilinx Employee
313 Views
Registered: ‎08-25-2010

回复: Decoupling Capacitor for MGT of Kintex

Jump to solution

Hi @serm_wang 

Those substrate package capacitors is helping maintain a low impedance, high-frequency path between power supply and ground, and noise attenuation in the package   

Thanks
Simon
-------------------------------------------------------------------------
Don't forget to reply, kudo, and accept as solution.
-------------------------------------------------------------------------

View solution in original post