The impedance calculation model in PCB design is summarized

- Jul 26, 2018-

  1. Calculation model of outer single-end impedance

H1: medium thickness Er1: dielectric constant W1: width of the bottom of the impedance line W2: width of the top of the impedance line T1: width of the top of the impedance line


This impedance calculation model is applicable to the calculation of the single end impedance of the printed resistance welding of the outer circuit.


Second, the outer differential impedance calculation model

Impedance line width: impedance line width: impedance line top width: impedance line spacing T1: finished copper thickness C1: resistance welding thickness of substrate C2: resistance welding thickness of copper sheet or wire line C3: resistance welding thickness above the substrate CEr: dielectric constant of resistance welding


This impedance calculation model is applicable to differential impedance calculation of the printed resistance welding of the outer circuit.


Third, the outer single-end impedance coplanar calculation model

Width of the bottom of the impedance line width of the top of the impedance line D1: distance between the impedance line and the surrounding copper skin


This impedance calculation model is applicable to the calculation of single-end coplanar impedance after the printed resistance welding of outer circuit.


Fourth, the outer differential impedance coplanar calculation model

The width of the bottom of the impedance line the width of the top of the impedance line the width of the top of the impedance line D1: the distance between the impedance line and the copper skins on both sides


This impedance calculation model is applicable to the differential coplanar impedance calculation of the printed resistance welding of the outer circuit.


5. Calculation model of single end impedance of inner layer

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


This impedance calculation model is applicable to the calculation of single end impedance of inner - layer circuit.


6. Calculation model of differential impedance of inner layer

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


This impedance calculation model is applicable to differential impedance calculation of inner - layer line.


7. Calculation model of single end impedance coplanar of inner layer

H1: medium thickness Er1: H1 corresponding to dielectric constant of medium layer H2: medium thickness Er2: H2 corresponding to dielectric constant of medium layer W1: width of bottom of impedance line W2: width of top of impedance line D1: distance between impedance line and surrounding copper layer T1: line copper thickness


This impedance calculation model is applicable to the calculation of single-end coplanar impedance of inner layer.


8. Common surface calculation model of differential impedance of inner layer

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


This impedance calculation model is applicable to the calculation of differential common surface impedance of inner layer