[SI-LIST] Re: 90 degree turn in PCB tracks
- From: Alan.Hiltonnickel@xxxxxxx
- To: Mark_Burford@xxxxxxxxxxx
- Date: Tue, 25 Jul 2006 10:38:02 -0700
Yeah, thanks. We were so worried.
:-P
Alan
Mark Burford wrote On 07/25/06 10:26,:
>Light will become the dominant force but there are still lots of HF
>applications that have to be considered in a mostly light circuit such
>as how does one power an led or laser to switch on and off at 10GHz?
>With light? We first need to create light. How do we clock a chip? How
>do we send light data across the internet and address the billions of ip
>addresses worldwide? Everyone gets a wavelength?!??!?1=20
>Sorry for off topic but I wanted to reassure SI people that there will
>always be high speed issues or maybe we will have solved them all by
>then?!
>
>Mark
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Grasso, Charles
>Sent: 25 July 2006 18:10
>To: leeritchey@xxxxxxxxxxxxx; Vishnu Mohan; lijun_hit@xxxxxxxxx
>Cc: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: 90 degree turn in PCB tracks
>
>In the year 21oo I predict signal transmission=3D20
>using light. SI (at least using copper) will fade into the distance!!
>
>Best Regards
>Charles Grasso
>Compliance Engineer
>Echostar Communications Corp.
>Tel: 303-706-5467
>Fax: 303-799-6222
>Cell: 303-204-2974
>Pager/Short Message: 3032042974@xxxxxxxxx
>Email: charles.grasso@xxxxxxxxxxxx;
>Email Alternate: chasgrasso@xxxxxxxx
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Lee Ritchey
>Sent: Tuesday, July 25, 2006 9:47 AM
>To: Vishnu Mohan; lijun_hit@xxxxxxxxx
>Cc: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: 90 degree turn in PCB tracks
>
>I wonder who started the rumor that right angle bends create acid traps.
>
>It is not true and has never been true. Fables die hard, both the right
>angle bend causing signal integrity problems and acid traps.
>
>Bet we don't get these flushed out of our profession before 2100 and
>maybe
>not even then!
>
>
>
>
>>[Original Message]
>>From: Vishnu Mohan <vishyin8@xxxxxxxxx>
>>To: <lijun_hit@xxxxxxxxx>
>>Cc: <si-list@xxxxxxxxxxxxx>
>>Date: 7/25/2006 12:55:11 AM
>>Subject: [SI-LIST] Re: 90 degree turn in PCB tracks
>>
>>Dear Dhaval,
>>To my kowledge 90 degree bends are not recomended because of the acid
>>
>>
>trap.
>
>
>>Some people says 90 degree bend can cause more reflection than 45
>>
>>
>degree,
>
>
>>but it is not true. At high frequency 90 degrees produce less
>>
>>
>reflection
>
>
>>than 45 degree.
>>
>>Please find the attached document.
>>
>>With Regards
>>Vishnu Mohan
>>
>>On 7/25/06, jun li <lijun_hit@xxxxxxxxx> wrote:
>>
>>
>>>I read a little about this topic. To 90 degree bend, there will be
>>>
>>>
>overlap
>
>
>>>area. It behaves as capacitive discontinuity. Moreover, the sharp
>>>
>>>
>point
>at
>
>
>>>the corner will enlarge electrical field.
>>>
>>> regards
>>>
>>>
>>>Dhaval Bhodia <bhodia1@xxxxxxxxx> wrote:
>>> Dear Experts
>>>I want to know that why PCB tracks can not have
>>>90 degree bend ? second why 45 degree bend is most
>>>preferable ? anybody has made any analysis on bending
>>>of PCB tracks ? what are the technical issues will
>>>come if some one makes 90 degree bend in PCB ? What
>>>are electrone and transmission line charasterisic
>>>stops to make that 90 degree turn in PCB tracks ?
>>>Regards
>>>Dhaval
>>>__________________________________________________
>>>
>>>
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>>
>>-- Binary/unsupported file stripped by Ecartis --
>>-- Type: application/pdf
>>-- File: 90deg.pdf
>>
>>
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--
Alan Hilton-Nickel
Signal Integrity Engineer
Sun Microsystems Inc.
Netra Systems and Networking
Newark, CA
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