[SI-LIST] Re: Reference plane layer
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Sumathi Kuppuswamy <sumathi_ramana@xxxxxxxxxxx>
- Date: Tue, 01 Sep 2009 22:26:38 -0700
To answer your question, consider what would happen if L3, and L5 had no
metal on them. Once you have that down, then consider what happens when
you add metal to L3 and L5.
Steve
Sumathi Kuppuswamy wrote:
> Hi Experts,
> We calculate the track width for the required impedence with reference to the
> immediate adjacent plane layer.
> Some people argue that, we can take the plane layer as reference even if it
> is not the immediate next layer.
>
> For example,
> Layer 1 ---
> Layer 2 --- Plane
> Layer 3 --- Signal
> Layer 4 --- Signal
> Layer 5 --- Signal
> Layer 6 --- Plane
> Layer 7 ---
> Layer 8 ---
>
> In the above stackup, can the Layer 4 signals take either Layer 2 or Layer 6
> as reference for impedance calculation?
> The height between the signal and plane layers, -- can we take the height
> between Layer 4 and Layer 2 or 6?
>
> Please reply.
>
> regards
> Sumathi
>
>
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