# Re: Formulas for Crosstalk Calculation PCB traces

Eric Bogatin ([email protected])
Sun, 06 Jul 1997 21:37:59 -0700

Hi Folks-

I thought Hans and a few others might be interested in knowing that Ansoft
has recently announced a new product ideally suited for exactly these sorts
of analysis problems. It is called Maxwell EZ2D Calculator. As its name
implies, it is an extremely easy to use 2D field solver that calculates all
the line parameters for transmission line structures such as those
described below.

The use of an accurate field solver means second and third order effects
can be included such as metal thickness and solder mask coating. In
addition to characteristic impedance and velocity, it also calculates cross
talk coefficients, mutual L and coupling C values. I would be more than
off line.

---eric bogatin

At 07:41 PM 7/3/97 +0000, you wrote:
>Hello
>
>I'm looking for formulas to calculate cross-talk for PCB traces.
>
>Therefore I'm looking on formulas to calculate mutual inductance and
>mutual capacitance for stripline and microstrip geometry.
>
> offset stripline:
>
> ___ ========================================= power plane (e.g. GND)
> | : Er :
> | : | w2 | :
> | : ____ __ :
> | : ___ |____| __ t2 :
> | : | :
> | : | |-----s-----| :
> b : | ____ __ :
> | : | ___ |____| __ t1 : (Trace 1 and
> | : h2 | : Trace 2
> | : | | | w1 | : have same
> | : | h1 : direction)
> | : | | :
> _|_ : _|_ _|_ :
> ========================================= power plane (e.g. GND)
>
>
>
> embedded microstrip:
>
> | w2 |
> ____ __ Er=1
> ___ ....___..|____|.__.t2...................
> | : | Er :
> | : | |-----s-----| :
> | : | ____ __ :
> | : | ___ |____| __ t1 :
> b : h2 | : (Trace 1
> | : | | | w1 | : and Trace 2
> | : | h1 : have same
> | : | | : direction)
> _|_ : _|_ _|_ :
> ========================================= power plane (e.g. GND)
>
>
>
>
>Anyone out there to point me to the right literature or solution?
>
>
>
>Thank you very much,
>
>Hans.
>
>
>======================================================================
>== Hans Ziegler, Toucan Technology, Galway Technology Centre,
>== Mervue Ind. Est., Galway, Ireland.
>== Phone: +00 353 91 757223
>== FAX: +00 353 91 755635
>== Email: [email protected]
>== WEB: http://www.toucan.ie
>======================================================================
>
>
**********************************************************************
Eric Bogatin
Product Manager, Signal Integrity Products
Ansoft Corporation
4675 Stevens Creek Blvd Suite 208
Santa Clara CA 95051-6374

voice: 408-261-9095 x13
fax: 408-261-1245
email: [email protected]

pager: 888-775-1138

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