时间：2009-12-29 09:21
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作者：admin
I would like to calculate the trace width to impedance
Problem
I am working on a four layer circuit board that will contain some RF traces and would like to know the layer stack-up and spacing that you use in order to calculate the trace width to impedance numbers
Solution
2-Layer PCB - 0.031" finished thickness
Layer 1 - Copper - 0.0014" thick (1 oz. copper weight)
Core material - 0.028" thick - Dielectric Constant of 4.7
Layer 2 - Copper - 0.0014" thick (1 oz. copper weight)
2-Layer PCB - 0.062" finished thickness
Layer 1 - Copper - 0.0014" thick (1 oz. copper weight)
Core material - 0.059" thick - Dielectric Constant of 4.7
Layer 2 - Copper - 0.0014" thick (1 oz. copper weight)
* Layer 1 & 2 copper thickness will be 0.0035 for a 2.5 oz. copper weight configuration
4-Layer PCB - 0.062" finished thickness
Layer 1 - Copper - 0.0014" thick (1 oz. copper weight)
Laminate (prepreg) - 0.0115"-0.0129" thick - Dielectric Constant of 4.6
Layer 2 - Copper - 0.0014" thick (1 oz. copper weight)
Core material - 0.028" thick - Dielectric Constant of 4.7
Layer 3 - Copper - 0.0014" thick (1 oz. copper weight)
Laminate (prepreg) - 0.0115"-0.0129" thick - Dielectric Constant of 4.6
Layer 4 - Copper - 0.0014" thick (1 oz. copper weight)
6-Layer PCB - 0.062" finished thickness
Layer 1 - Copper - 0.0014" thick (1 oz. copper weight)
Laminate (prepreg) - 0.007" thick - Dielectric Constant of 4.6
Layer 2 - Copper - 0.0014" thick (1 oz. copper weight)
Core material - 0.014" thick - Dielectric Constant of 4.7
Layer 3 - Copper - 0.0014" thick (1 oz. copper weight)
Laminate (prepreg) - 0.010" thick - Dielectric Constant of 4.6
Layer 4 - Copper - 0.0014" thick (1 oz. copper weight)
Core material - 0.014" thick - Dielectric Constant of 4.7
Layer 5 - Copper - 0.0014" thick (1 oz. copper weight)
Laminate (prepreg) - 0.007" thick - Dielectric Constant of 4.6
Layer 6 - Copper - 0.0014" thick (1 oz. copper weight)
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