[SI-LIST] Re: Seperate Sparameter for gnd & supply plane !!
- From: Rajan Hansa <all.si.list@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 1 Jun 2011 15:59:22 +0530
Steve,
You are right !! Our analog engineer basically wants to see ground
bounce w.r.t pcb ground which was not possible with single s-parameter but
you said that I have to do whole lot more than just produce s-parameters
between one port inside the package and some other virtual port.
Can you help me to understand that why separate s-parameter is not
sufficient to see ground bounce and what is the right way to handle such
problems ??
Rajan
On Wed, Jun 1, 2011 at 3:30 PM, steve weir <weirsi@xxxxxxxxxx> wrote:
> What it sounds like your analog engineer wants is to be able to figure out
> how much bounce will occur in each plane relative to some external
> reference, such as the PCB Vss plane. In order to figure that out, you have
> to do a whole lot more than just produce s-parameters between one port
> inside the package and some other virtual port. Your analog engineer needs
> to be more specific about what he wants to figure out.
>
> Steve.
>
>
> On 6/1/2011 1:41 AM, Rajan Hansa wrote:
>
>> Guys,
>> I have got a request to provide sparameter for one package but this time
>> my
>> analog engineer wants seperate s-parameter for gnd& supply plane. The
>> reason he gave is that with single sparameter for vdd& gnd plane. He
>> can't
>> see gnd noise as s-parameter is generated with gnd as reference so it'll
>> always be seen as '0' but that problem won't come in separate s-parameters
>> for gnd& supply planes.
>>
>> Though the tool I am using has an option to generate sparameter with
>> reference to some virtual point and I can use that option to generate
>> separate sparameters for gnd& supply but problem is that I have not still
>> understood if using separate s-parameter is a right way to do things and
>> if
>> it's the standard practice in industry.
>>
>> Experts comments please.
>>
>> Rajan
>>
>>
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>
> --
> Steve Weir
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