[SI-LIST] Re: 90 degree bend

  • From: "Zhou, Xingling (Mick)" <xlzhou@xxxxxxxxx>
  • To: <k.kanakaraj@xxxxxxxxxxxxx>, <pcb_user@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 30 Aug 2004 15:55:47 -0400

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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