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Noobs's avatar
Noobs
Icon for New Contributor rankNew Contributor
4 days ago

PDN file and PCB decoupling

Hello,

In the PDN excel file how is determined the ESR and ESL value for the decoupling capacitor ?
I would like to add bigger capacitor .
Is there some explanation for this file ? all the cells are locked.
Is there some explanation to help to determine the number of capacitor needed for an application.
I put the power rail voltage and current and now I need to determine the capacitor decoupling for each rail.

I'm using a 5CEFA4_M13 chip on my board.

Thanks for your help

 

3rd party board

1 Reply

  • Farabi's avatar
    Farabi
    Icon for Regular Contributor rankRegular Contributor
    4 hours ago

    Hello,

     

    ESR and ESL is mention on each capacitor manufacturer datasheet. PDN dont mention that. 

    You only put the capacitor ESR and ESL and PDN will calculate for you. 

    All you need to monitor is the Zeff must be below the Ztarget all the way to feff. 

    link : https://www.altera.com/design/resource/power/pdn-network

     

    regards,

    Farabi