[SI-LIST] Re: Power Integrity about Vtt of DDR
- From: Zhangkun <zhang_kun@xxxxxxxxxx>
- To: hmurray@xxxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Sun, 16 May 2004 11:46:52 +0800
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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