[SI-LIST] Re: Transmission Line calculator Problem!
- From: V S <for_si2003@xxxxxxxxx>
- To: SI-LIST@xxxxxxxxxxxxx
- Date: Mon, 16 Mar 2009 08:28:39 -0700 (PDT)
The figures for h is not clear ( looks like the email or the si-list screws up
the thing). If you can resend the value of h, clearly spacifying what it is, I
can run a quick hspice 2D solver and get back to you.
Vikas Shukla
http://referencedesigner.com
--- On Sun, 3/15/09, Mohamad Haghtalab <mohaghtalab@xxxxxxxxx> wrote:
> From: Mohamad Haghtalab <mohaghtalab@xxxxxxxxx>
> Subject: [SI-LIST] Transmission Line calculator Problem!
> To: SI-LIST@xxxxxxxxxxxxx
> Date: Sunday, March 15, 2009, 9:35 AM
> Hi all
>
> I want to design diff Lines for carrying LVDS
> Signals(pulses with 100MHz and rise time of <1 ns) in
> form of Stripline and MicroStrip,but I have problem with
> calculating exactly their characteristic Impedance.
> In both HyperLynx(from mentor) and Cadence Allegro(V16.2)
> (Transmission Line Calculator) I tryed to calculate this,but
> what I obtained in both is different with each other
>
> I want to achieve 100 ohm for Zdiff, I derived (from
> formula and constraints) :
>
> Stripline : W=5 mil S=5 mil h$mil
> microstrip:
> W mil S=5 mil h mil
>
> dielectric : FR4
>
> copper thickness : 1.4 mil
>
> for Stripline
>
> HyperLynx : 85.5 ohm
> Allegro : 74.34 ohm
>
> for microstrip
>
> HyperLynx :97 ohm
> Allegro : 92.37 ohm
>
> so What Should I do ? (for exactly calculating Z0)
>
> Thanks for Help
>
> Best Regards
>
>
>
>
>
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