[SI-LIST] Re: Stitching CAPs between DDR VDD and VTT Power Rails
- From: steve weir <weirsp@xxxxxxxxxx>
- To: harjeet.randhawa@xxxxxxxxxxxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 19 Dec 2003 04:55:09 -0800
Harjeet, you are mixing concepts. Capacitors set a frequency dependent
Z. For any PDS, dV = dI * Z.
Steve.
At 06:08 PM 12/19/2003 +0530, Harjeet Randhawa wrote:
>Hello,
>
>The DDR termination power rail should have sinking capability. Normally
>VTT is generated from the VDD and in switching regulator based solutions
>the upper FET provides the sinking path from VTT to VDD.
>
>With the upper condition met, How does an array of stitching capacitors
>(several 0.1uf ceramic caps and few larger tantalum caps) between the
>VDD and VTT helps?
>
>Thanking all in advance,
>Regards,
>Harjeet.
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