[SI-LIST] Re: spice-impedance profile of pdn
- From: Ray Anderson <ray.anderson@xxxxxxxxxx>
- To: "nazish irfan" <irfannazish@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 22 May 2009 14:38:36 -0700
In your step 3, what value of DC resistance are you placing from the
input of the PDN to GND? And why?
You DC resistance may be swamping the PDN impedance.
What doesn't seem to make sense?
-Ray Anderson
Xilinx Inc.
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of nazish irfan
> Sent: Friday, May 22, 2009 2:28 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: spice-impedance profile of pdn
>
>
> Hi All
>
> I am trying to simulate in LT Spice to get impedance profile of power
> distribution network.
>
> steps I am following are:
>
> 1: make a netlist of all cap, ind and resistors
>
> 2: connecting a 1A AC current source at node 1 (input) so as to make
V=Z
>
> 3: connecting a dc path resistance from node 1 to ground
>
> 4: then do AC analysis and use .NET to get Z (impedance) at node 1
>
> results I am getting does not seems to make sense
>
> Can anybody suggest me something or do anybody has done this before
and
> can give me sample netlist to get an idea.
>
> regards
> Nazish
>
>
>
>
>
>
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