[SI-LIST] Re: 90 degree bend
- From: Geoff Stokes <gstokes@xxxxxxxxx>
- To: "'Charles.Grasso@xxxxxxxxxxxx'" <Charles.Grasso@xxxxxxxxxxxx>, "'cpad@xxxxxxxxx'" <cpad@xxxxxxxxx>, "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 2 Sep 2004 10:04:56 +0100
Hi All
No-one has mentioned the tools which can characterise 90 degree bends and
other RF discontinuities on screen. These include, in roughly increasing
order of cost:
Eagleware Genesys
AWR Microwave Office
Agilent EEsof
Cadence SpectreRF
The effects are small but noticeable at about 1 GHz, increasing at higher
frequencies. Some of these tools will be too expensive for some operations,
but Eagleware do a personal version which does the job for around 1k
dollars. The models are semi-empirical circuit equivalents which are very
good up to 3 or 4 Ghz and are useful up to 10 GHz or possibly more. For
best accuracy at high frequencies a 3D wave simulator is required, such as
Ansoft HFSS or CST Microwave Studio.
Cheers
Geoff
> -----Original Message-----
> From: Grasso, Charles [mailto:Charles.Grasso@xxxxxxxxxxxx]
> Sent: 30 August 2004 22:34
> To: 'cpad@xxxxxxxxx'; 'si-list@xxxxxxxxxxxxx'
> Subject: [SI-LIST] Re: 90 degree bend
>
>
> Chris,
>
> When signals have a rise time of 100pS or better
> that translates to a bw of 3.5GHz (well into the
> uwave region) - So aren't bends important in this case?
>
> Best Regards
> Charles Grasso
> Senior Compliance Engineer
> Echostar Communications Corp.
> Tel: 303-706-5467
> Fax: 303-799-6222
> Cell: 303-204-2974
> Email: charles.grasso@xxxxxxxxxxxx;
> Email Alternate: chasgrasso@xxxxxxxx
>
>
>
> -----Original Message-----
> From: Chris Padilla [mailto:cpad@xxxxxxxxx]
> Sent: Monday, August 30, 2004 10:23 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: 90 degree bend
>
>
> I have yet to see any issue arising from bends described as
> below. Simulation doesn't show much and neither does real
> life. In the
> microwave world, yes, they will need consideration.
>
> Chris Padilla
> EMC Engineer
> Cisco Systems
> San Jose, CA
>
> At 09:20 PM 8/30/2004 +0530, Kanakaraj wrote:
> >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
> > > 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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