[SI-LIST] Re: Transmission Line calculator Problem!

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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