[SI-LIST] Re: High Speed Routing

Zeeshan,
Feel free to send me the bill.  It's the most I can do.

Scott

Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

http://www.teraspeed.com

Teraspeed® is the registered service mark of
Teraspeed Consulting Group LLC



Zeeshan Siddiqi wrote:
> Scott: you owe me a keyboard.. i laughed so hard pepsi
> came out my nose.. thanks for the mid week relief.
>
> Pon: We are all here to learn and share our
> experiences. If you have a specific questions, than
> the gurus will be more than happy to impart their
> wisdom, but the questions you presented were so open
> ended that most of us here could fill entire volumes
> discussing them. Hope you would spend some time
> googling the material and come back with some
> interesting questions. Best of luck.
>
> -zeeshan
>
>
>   
>>> [Original Message]
>>> From: Scott McMorrow <scott@xxxxxxxxxxxxx>
>>> To: <ponganesh@xxxxxxxxxxxxxxxxxx>
>>> Cc: <si-list@xxxxxxxxxxxxx>
>>> Date: 5/30/2007 10:47:39 AM
>>> Subject: [SI-LIST] Re: High Speed Routing
>>>
>>> Pon,
>>>
>>> Go out and do your own research before you pose a
>>>       
>> plethora of questions 
>>     
>>> like this. It looks like you are a University
>>>       
>> student trying to answer 
>>     
>>> questions on a take-home test.
>>>
>>> Scott
>>>
>>> Scott McMorrow
>>> Teraspeed Consulting Group LLC
>>> 121 North River Drive
>>> Narragansett, RI 02882
>>> (401) 284-1827 Business
>>> (401) 284-1840 Fax
>>>
>>> http://www.teraspeed.com
>>>
>>> Teraspeed® is the registered service mark of
>>> Teraspeed Consulting Group LLC
>>>
>>>
>>>
>>> Pon Ganesh wrote:
>>>       
>>>> Expecting your answers for the below.
>>>>   a.. I have two groups of signals Group-A (3GHz
>>>>         
>> differntial pair) and
>> Group-B (16bit, 250MHz DDR2 single ended lines).
>> Both A&B can't be routed
>> in inner layers. Either one must be routed on
>> Microstrip. Which one u ll
>> route in Micro strip (Single ended-250Mhz/diff3Ghz)
>> ? 
>>     
>>>>   b.. Whats the use of dual stripline, when
>>>>         
>> no.of layers is not a
>> issue., 
>>     
>>>>   c.. why don't u prefer odd-no of layers ? (
>>>>         
>> answers other than... PCB
>> warpage, Fab feasilbility and Cost) 
>>     
>>>>   d.. U have 20MHz and 200MHz signal on a same
>>>>         
>> layer. How ll u route .
>> Isolation ? 
>>     
>>>>   e.. How stitching capacitors are useful to
>>>>         
>> minimize in-rush current 
>>     
>>>>   f.. When ll u use spoke vias. whts the
>>>>         
>> disadvantage of spoke vias
>>     
>>>>   g.. Why do we noramlly short isolated Analog
>>>>         
>> and Digital digital GNDs
>> on a small area
>>     
>>>> Thanks,
>>>> Pon Ganesh
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