[SI-LIST] Reference plane layer
- From: Sumathi Kuppuswamy <sumathi_ramana@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 2 Sep 2009 10:38:05 +0530 (IST)
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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