[SI-LIST] Re: Ground, the preferred reference plane

  • From: Vinu Arumugham <vinu@xxxxxxxxx>
  • To: chris.cheng@xxxxxxxxxxxx
  • Date: Wed, 11 Dec 2002 23:54:51 -0800



Chris Cheng wrote:

>Take an example of DDR in most PC design. The vref on receivers is basically
>the VTT which usually is generated from an external DC/DC converter that
>generates VDDQ/2 and is completely isolated from the driver VDDQ. 
>
That does not sound like a good thing...
The receiver Vref should be driver Vddq/2. We usually generate it with a 
resistor divider from driver Vddq.
This way, Vref will track Vddq better...

Thanks,
Vinu

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