[SI-LIST] Re: [SI-LIST]: Design a shielded differential line

Dan,
That would be great.  I thought that might be the case.
Ken

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Dan Swanson
Sent: Wednesday, May 29, 2002 5:45 AM
To: si-list
Subject: [SI-LIST] Re: [SI-LIST]: Design a shielded differential line




Brian's book is a good collection
but there are a lot of errors in
the equations. I have a twelve page
errata sheet he put together. If
I can find the electronic original,
will send it to Ray to post.

I always check the original source
before I use any the of the equations.

Dan

Dan Swanson         EMAIL:      d.swanson@xxxxxxxx
Forem USA                PHONE:         978-834-4085
37 South Hunt Road      FAX:    978-388-7077
Amesbury, MA  01913


> -----Original Message-----
> From: Charles Grasso [mailto:cgrassosprint1@xxxxxxxxxxxxx]
> Sent: Wednesday, May 29, 2002 1:14 AM
> To: johnlipsius@xxxxxxxxx; si-list
> Subject: [SI-LIST] Re: [SI-LIST]: Design a shielded differential line
> 
> 
> 
> I have to ask this..
> 
> I noticed that Wadells book is referenced. How
> many people have actually USED the equations
> in the book ?? For example for the equation
> for the shielded broadside coupled pair,
> he uses k,K and K prime. In defining k he
> has the unknown on the LHS of the equation.
> If anyone knows how to decipher the equation
> can they please let me know?
> 
> 
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of john lipsius
> Sent: Tuesday, May 28, 2002 5:10 PM
> To: si-list
> Subject: [SI-LIST] Re: [SI-LIST]: Design a shielded differential line
> 
> 
> 
> 
> 
> 1. I would use a field solver, like Apsim RLGC or Ansoft.
> 2. I would not use broadside, as you show.  I would use edge-coupled,
> instead, due
>     to manufacturing problems (difficult to maintain the 
> geometry, therefore
> the Z).
> 3. Reference:  "Transmission Line Design Handbook",  Brian 
> Wadell.  See
>     sec. 4.6.
> 4. A shielded pair would have contiguous reference copper around all 4
>     sides.  Your diagram doesn't show this.
> 5. Not sure why you specify "minimum capacitance between the 
> differential
> line
>     and the ground" since that's fairly well set by your 
> choice of FR4 and
> W,
>     unless you're doing something exotic like minimizing 
> electrical length
> or
>     maximizing phase velocity, which aren't of concern, I 
> believe, in normal
>     digital interconnect.
> 
> 
> 
> ----- Original Message -----
> From: "PRIEUR, Olivier" <Olivier.PRIEUR@xxxxxxxxxxxxxxxxx>
> To: "si-list" <si-list@xxxxxxxxxxxxx>
> Sent: Tuesday, May 28, 2002 7:15 AM
> Subject: [SI-LIST] [SI-LIST]: Design a shielded differential line
> 
> 
> >
> > Dear All,
> >
> > I want to design a shielded differential line in a PCB.
> > Nominal characteristic impedance of the differential line 
> is 70 to 85 ohms
> > The recherched struture is
> > ______________            GND
> >        ___                  h1
> >        ___                  h
> > ______________    h1   GND
> > I have the added constraints:
> > minimum width W of trace is .216 mm
> > thickness h, h1 of dielectric is 0.1/0.2/0.3/0.4/0.5
> > substrate dielectric constant about 4.7 (FR4)
> > I look for h, h1 and W.
> > I want a minimum capacitance between the differential line 
> and the ground.
> > Do you know a formula, an article about this topic?
> >
> > Best regards,
> >
> > ------------------------------------
> > Olivier PRIEUR
> > e-mail: olivier.prieur @astrium-space.com
> > ------------------------------------
> >
> >
> >
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