[SI-LIST] Re: 90 degree bend

At the risk of getting reprimanded by Lee et al. and being sent back to 
school, what is the famous 2.5 D naming problem? Google didn't present 
anything useful on the first result page, therefore it doesn't exist. :-)
Cheers,

Stefan

Zhou, Xingling (Mick) wrote:

>Hi,
>
>I remember in physics we can estimate how much energy is needed for an
>electron to escape the surface of a conductor and also the significant
>difference between the speeds of electrons and light (EM waves).  Some
>people are trying to explain the phenomena intuitively by some
>similarities. However, we could be easily confused by mis-understanding
>the behavior of waves and particles and the relations. Is EMI caused by
>the off-PCB electrons at all? Etc. From practical engineering point of
>view, it may be O.K.  However, from scientific point of view, we need to
>be careful. There are some other similar situation in our society such
>as the famous 2.5 D naming problem.
>
>Regards,
>
>Mick
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Kanakaraj
>Sent: Monday, August 30, 2004 11:50 AM
>To: pcb_user@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: 90 degree bend
>
>
>Hi,
>The simplest thing is that when you make 90 degree turns on the pcb
>track, the electron moving in it cannot make sudden turns..( remember
>inertia of direction in physics and a bus making a 90 degree turn at
>full speed)... so some of the electrons will jump out of the pcb track
>and will cause emi issues..
>
>and Andy, Andrew, Ray anderson and the seniors will give you more inputs
>on that. Well I am too like you. a beginner :-) Kanak
>
>----- Original Message -----
>From: "New Bee" <pcb_user@xxxxxxxxxxx>
>To: <si-list@xxxxxxxxxxxxx>
>Sent: Monday, August 30, 2004 5:19 PM
>Subject: [SI-LIST] 90 degree bend
>
>
>  
>
>>Hi
>>
>>I am a new PCB designer.
>>
>>I have a silly doubt - really do not know if I ask it in this forum.
>>
>>
>>why is it suggested not to have 90 degree bends for the traces while
>>    
>>
>routing ?
>  
>
>>If some one can give me the electrical/electronics and manufacturing
>>    
>>
>reasons I will be greatful to them
>  
>
>>If this is not the right forum to address this please let me know=20
>>where
>>    
>>
>can I ask
>  
>
>>Thanks in advance
>>Kam
>>
>>Yahoo! India Matrimony: Find your life partner online.
>>
>>
>>Yahoo! India Matrimony: Find your life partneronline.
>>
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-- 

Ludwig Systems Engineering         Consulting - Design - Implementation
WWW: www.ludwigsystems.com         System Architectures - FPGAs - PCBs
Ph/Fx: +41-43-355-58-73/74         Hardware - Firmware - Software



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