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Senthil Velmurugan | 1 Sep 2004 03:29
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90 degree bend -links

Some articles link
http://www.omnigraph.com/subpages/articles2/frame.html?article=3Dcorner.h=
t
ml =20

http://www.ultracad.com/90deg.pdf

http://www.ultracad.com/flying.htm

Thanks
Senthil
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G.Srinivasan | 1 Sep 2004 08:54

Loading CADSTAR layout in Specctraquest!

I have some layouts made in CADSTAR & ORCAD. Can I load them in 
Specctraquest? The openbook lists some s/w names only for importing third 
party logic but I didn't find anything for importing a board. 

-- 
G.Srinivasan
Scientist/Engineer
Payload Checkout Electronics Division
Sensor Electronics Group
SAC/ISRO, Ahmedabad-380015.
Phone:
Off:079-26914217,26914250
Res:079-31104274

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Ray Anderson | 1 Sep 2004 16:02
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Re: Loading CADSTAR layout in Specctraquest!

G.Srinivasan wrote:

>I have some layouts made in CADSTAR & ORCAD. Can I load them in 
>Specctraquest? The openbook lists some s/w names only for importing third 
>party logic but I didn't find anything for importing a board. 
>
>  
>
Since Cadence owns both the Orcad and Specctraquest products I would 
suspect there is a path for connectivity. Don't know about Cadstar. I 
think your local AE (Apps Engineer) from Cadence would be your primary 
source of info on this question.

-Ray

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Murphy Jack-MGI2488 | 1 Sep 2004 17:05

Re: 90 degree bend -links

If noise generated on a plane or trace is a function of pulse rise time and not the signal frequency then why do
the EMC test labs ask for clock frequencies before testing?  EMI testers usually try to trace narrow band
radiated emissions to harmonics of a clock.  

Thanks in advance,

Jack

-----Original Message-----
From: si-list-bounce@...
[mailto:si-list-bounce@...]On Behalf Of Senthil Velmurugan
Sent: Tuesday, August 31, 2004 9:30 PM
To: si-list@...
Subject: [SI-LIST] 90 degree bend -links

Some articles link
http://www.omnigraph.com/subpages/articles2/frame.html?article=3Dcorner.h=
t
ml =20

http://www.ultracad.com/90deg.pdf

http://www.ultracad.com/flying.htm

Thanks
Senthil
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Tom Dagostino | 1 Sep 2004 20:25

Re: 90 degree bend -links

A step generates broad band "noise".  The 3 dB point of that noise is
related to the risetime of the step, the faster the step the wider the
bandwidth.  BW = 0.35/risetime is a good approximation of the bandwidth of
the energy.  The step is what determines the current peak demand, how the
aggressor will couple into victims and at what length traces become
transmission lines.

The clock frequency sets up the series of harmonics that form the square
wave used as the clock.  Any time you have a regular waveform you will see
the fundamental and its Fourier series as peaks in the radiated emissions.
The risetime will let you know how far out in frequency there are
significant harmonic.

Tom Dagostino
Teraspeed Consulting Group LLC
503-430-1065
tom@...
www.teraspeed.com

-----Original Message-----
From: si-list-bounce@...
[mailto:si-list-bounce@...]On Behalf Of Murphy Jack-MGI2488
Sent: Wednesday, September 01, 2004 8:06 AM
To: si-list@...
Subject: [SI-LIST] Re: 90 degree bend -links

If noise generated on a plane or trace is a function of pulse rise time and
not the signal frequency then why do the EMC test labs ask for clock
frequencies before testing?  EMI testers usually try to trace narrow band
radiated emissions to harmonics of a clock.
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Geoff Stokes | 2 Sep 2004 11:04

Re: 90 degree bend

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@...]
> Sent: 30 August 2004 22:34
> To: 'cpad@...'; 'si-list@...'
> Subject: [SI-LIST] Re: 90 degree bend
> 
> 
> Chris,
>
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Pay Chee How | 2 Sep 2004 12:15
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Hyperlynx

Hi,

1. I am currently trying to run a simulation using a software called 
Hyperlynx 7.2 .  I need to build a
   model for pogo pin and how can I create a file(in .slm format) if I 
already have all the specifications
   of the pogo pin...Is there any guide to write this file(.slm format)?
2. Is there anyway that i can set a tester(driver) in Hyperlynx to a 
particular set of pattern(say
    0110) and observe the result at the moment the driver finshes driving?

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Ravindra | 2 Sep 2004 23:47
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Bulk caps

Hi Gurus!
How do i decide as to how many bulk caps should be used at the stage of
schematic entry and also what values??
I would like to know as to on what basis the placement of these bulk
capacitors is done
on board.Are there any related documents on this?

Regards,
Ravindra

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Sobrany RF Mr (PG - Electronic Eng | 2 Sep 2004 16:30
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Propagation constants of lossy coupled transmission lines

Formulae to calculate the propagation constants of two lossless coupled transmission lines in terms of
the self and mutual inductances and capacitances per unit length can be found in the paper by Tripathi in
the February 1977 edition of IEEE Trans. on Microwave Theory and Techniques.
Replacing L by R+jwL and C by G+jwC results in formulae to calculate the propagation constants of two lossy
coupled transmission lines. For single ended transmission lines where gamma=sqrt((R+jwL)(G+jwC)) an
approximation of the attenuation constant can be calculated using Taylor series and this procedure is
detailed in Pozar. Has anyone calculated approximations for the attenuation constants for both the c and
pi modes of two lossy coupled transmission lines using Taylor series? The math is horrendously difficult
and I can't seem to separate out the phase constant component from inside the square root.

I hope somebody can help me.

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Vinu Arumugham | 2 Sep 2004 17:57
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Re: 90 degree bend

LC (free download) from http://lc.cray.com too can characterize such 
structures.
Thanks,
Vinu

Geoff Stokes wrote:

>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
>
>  
>
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Gmane