How to do **PCB Impedance calculation** model encountered in PCB design

First, the outer layer single-ended impedance calculation model,

H1: dielectric thickness Er1: dielectric constant W1: impedance line bottom width W2: impedance line top width T1: finished copper thickness C1: substrate solder resist thickness C2: solder bump thickness on copper or trace CEr: solder resist Dielectric constant

This impedance calculation model is suitable for: single-ended impedance calculation after outer line solder resist welding

Second, the outer layer differential impedance calculation model

H1: dielectric thickness Er1: dielectric constant W1: impedance line bottom width W2: impedance line top width S1: impedance line spacing T1: finished copper thickness C1: substrate solder resist thickness C2: copper or trace solder resist Thickness C3: Solder Mask Thickness on Substrate CEr: Dielectric Constant of Solder Mask

This impedance calculation model is suitable for: differential impedance calculation after outer line solder resist.

Third, the outer layer single-ended impedance coplanar calculation model

H1: dielectric thickness Er1: dielectric constant W1: impedance line bottom width W2: impedance line top width D1: impedance line to surrounding copper skin distance T1: finished copper thickness C1: substrate green oil thickness C2: copper skin or go Green oil thickness on the line CEr: Dielectric constant of green oil

This impedance calculation model is suitable for the calculation of single-ended coplanar impedance after outer line solder resist welding.

Fourth, the outer layer differential impedance coplanar calculation model

H1: dielectric thickness Er1: dielectric constant W1: impedance line bottom width W2: impedance line top width D1: impedance line to copper distance on both sides T1: finished copper thickness C1: green oil thickness of pcb substrate C2: copper or go Green oil thickness on the line C3: Green oil thickness on the substrate CEr: Dielectric constant of green oil

This impedance calculation model is suitable for the calculation of differential coplanar impedance after outer line solder resist.

Fifth, the inner layer single-ended impedance calculation model

H1: dielectric thickness Er1: dielectric constant H2: dielectric thickness Er2: dielectric constant W1: impedance line bottom width W2: impedance line top width T1: finished copper thickness

This impedance calculation model is suitable for: single-ended impedance calculation of the inner layer.

Six, the inner layer differential impedance calculation model

H1: dielectric thickness Er1: dielectric constant H2: dielectric thickness Er2: dielectric constant W1: impedance line bottom width W2: impedance line top width S1: impedance line spacing T1: finished copper thickness

This impedance calculation model is suitable for: inner line differential impedance calculation.

Seven, inner layer single-ended impedance coplanar calculation model

H1: dielectric thickness Er1:H1 corresponds to dielectric layer dielectric constant H2: dielectric thickness Er2:H2 corresponds to dielectric layer dielectric constant W1: impedance line bottom width W2: impedance line top width D1: impedance line to surrounding copper skin distance T1: Copper line thickness

This impedance calculation model is suitable for: inner-layer single-ended coplanar impedance calculation.

Eight, inner layer differential impedance coplanar calculation model

H1: medium thickness H2: medium thickness W1: impedance line bottom width W2: impedance line top width S1: impedance line spacing D1: impedance line to surrounding copper skin distance T1: line copper thickness Er1: H1 corresponding dielectric layer dielectric constant Er2 :H2 corresponds to the dielectric constant of the dielectric layer

This impedance calculation model is suitable for: inner differential coplanar impedance calculation.

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