Vtt the same as Vref - why different capacitor banks?

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Anonymous
Not applicable

"Reference Schematic Design Recommendation for QDR-DDR II/II+/Xtreme SRAMs - KBA84386" www.cypress.com/ states that Vtt and Vref are both VDDQ/2, but that they have separate capacitor banks. Why the distinction?https://www.cypress.com/?id=4&rID=72249

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1 Solution
PriteshM_61
Employee
Employee
25 solutions authored 10 solutions authored 5 solutions authored

Hi,

   


   

        

   

                  

   

 

   

 

It is better to have two different circuits for generating VTT and Vref. In this case the voltage variations becasue of Vterm will not affect Vref.


   

So separate decoupling network for VTT and Vref is preffered.

   


   

Thanks

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2 Replies
PriteshM_61
Employee
Employee
25 solutions authored 10 solutions authored 5 solutions authored

Hi,

   


   

        

   

                  

   

 

   

 

It is better to have two different circuits for generating VTT and Vref. In this case the voltage variations becasue of Vterm will not affect Vref.


   

So separate decoupling network for VTT and Vref is preffered.

   


   

Thanks

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Anonymous
Not applicable

 Thank you PRIT!

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