Zdiff ~ 97 ohm for:
Plane
-----------------------
14 mil
--------
| L1 |
--------
10 mil
--------
| L2 |
--------
14 mil
-----------------------
Plane
and,
Zdiff ~ 104 ohm for:
--------
| L1 |
--------
10 mil
--------
| L2 |
--------
Vinu
Magnus Homann wrote:
> Hi all,
>
> We're thinking about using a dual stripline for a differential
> pair. The diff. impedance should be 100ohm.
>
> Have anyone used this before? Or seen it in suggested? Come to think
> of it, it does sound like a good idea (not mine). Now, the hard part
> is getting the right geometry... Any help from various programs or
> books? Any references would very helpful, the only one I found is in
> "Transmission Line Design Handbook", and it is not very clear. Can you
> analyze this with a field solver?
>
> The concept goes like this (cut-through view of the board):
>
> Plane
> -----------------------
>
>
> --------
> | L1 |
> --------
>
> --------
> | L2 |
> --------
>
>
> -----------------------
> Plane
>
> The Zdiff should be between L1 and L2.
>
> Homann