[SI-LIST] Re: Power Integrity about Vtt of DDR
- From: Hal Murray <hmurray@xxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 15 May 2004 11:33:19 -0700
> 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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