[SI-LIST] Re: Seperate Sparameter for gnd & supply plane !!

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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