A Tale of Two Data Sheets and How Foil Roughness Affects Dk
When doing printed circuit board (PCB) stackup and signal integrity (SI) impedance modeling, we need to get the dielectric material properties from the right sources. One important parameter for accurate impedance modeling is relative permittivity (ε r) of the dielectric material, otherwise known as dielectric constant (Dk). The best source is from laminate suppliers’ data sheets. But there is an issue I like to think of as, “A tale of two data sheets”.
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