[SI-LIST] Re: [SI-LIST]: Design a shielded differential line
- From: Dan Swanson <DSWANSON@xxxxxxxxxxxxx>
- To: si-list <si-list@xxxxxxxxxxxxx>
- Date: Wed, 29 May 2002 07:45:05 -0400
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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