[SI-LIST] Re: Power Integrity about Vtt of DDR

This kind of question has been talked about for several times in si-list : ) 
There is no exact answer.

----- Original Message ----- 
From: "Hal Murray" <hmurray@xxxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Cc: <hmurray@xxxxxxxxxxxxxxx>
Sent: Sunday, May 16, 2004 2:33 AM
Subject: [SI-LIST] Re: Power Integrity about Vtt of DDR


> 
> > For  Vdd decoupling you will need to compute the worst case
> > instantaneous  current required by your devices and the acceptable
> > noise level,  (usually 5%) and from that compute the necessary ESL to
> > accomplish  this.
> 
> Just to be a nit-picker...
> 
> Assuming that the manufacturer allows 5% tolerance on the supply voltage, 
> using all of that 5% for noise only works if your regulation is exactly on 
> target.
> 
> How do people normally divide up that budget?
> 
> 
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> 
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