[SI-LIST] Re: Seperate Sparameter for gnd & supply plane !!
- From: 吴枫 <wufengthu@xxxxxxx>
- To: "steve weir" <weirsi@xxxxxxxxxx>
- Date: Thu, 2 Jun 2011 14:10:20 +0800 (CST)
快捷回复给：steve weir, si-list, Rajan Hansa
At 2011-06-01 18:40:50，"steve weir" <weirsi@xxxxxxxxxx> wrote:
>You have a matrix of current sources attached to a matrix of RLCG legs,
>and you want to know the noise voltage that occurs between different
>point pairs in that matrix. If the product of the static and dynamic
>currents against a section of those legs is very small, you can treat
>that region as a quasi- equipotential. Otherwise you have to treat the
>point pairs as unique.
>Steve
>
>On 6/1/2011 3:29 AM, Rajan Hansa wrote:
>>
>> 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
>> <mailto: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
>> IPBLOX, LLC
>> 150 N. Center St. #211
>> Reno, NV 89501
>> www.ipblox.com <http://www.ipblox.com/>
>>
>> (775) 299-4236 Business
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>>
>>
>>
>
>
>--
>Steve Weir
>IPBLOX, LLC
>150 N. Center St. #211
>Reno, NV 89501
>www.ipblox.com
>
>(775) 299-4236 Business
>(866) 675-4630 Toll-free
>(707) 780-1951 Fax
>
>
>
>
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