Impedance calculation model encountered in PCB design

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Summary：impedance calculation model encountered in PCB design

During the PCB design process, we are inevitable to have the impedance control design. This blog summaries the impedance calculation model for you. Hope it will be helpful.

1.   Outer single impedance calculation model
H1:dielectric thickness Er1: dielectric constant W1:width at the base of the impedance line W2:width of the top impedance line T1:finished copper thickness C1: soldermask thickness of the base material C2:impedance thickness on the copper or trace CEr:dielectric constant of the soldermask
Applied for: Outer single impedance calculation model



2.   Outer differential impedance calculation model
H1:dielectric thickness Er1: dielectric constant W1:width at the base of the impedance line S1:impedance line spacing W2:width of the top impedance line T1:finished copper thickness C1:soldermask thickness C2:impedance thickness on the copper or trace C3:soldermask thickness CEr:dielectric constant of the soldermask
Applied for: Outer differential impedance calculation model


3.  Outer single terminal impedance coplanar calculation model
H1:dielectric thickness Er1: dielectric constant W1:width at the base of the impedance line S1:impedance line spacing W2:width of the top impedance line D1:distance between impedance line and surrounding copper T1:finished copper thickness C1:soldermask thickness of the base material C2:impedance thickness on the copper or trace CEr:dielectric constant of the soldermask
Applied for: Outer single terminal impedance coplanar calculation model


4.  Outer differential impedance coplanar calculation model
H1:dielectric thickness Er1: dielectric constant W1:width at the base of the impedance line W2:width of the top impedance line D1:distance between impedance line and surrounding copper T1:finished copper thickness C1:soldermask thickness C2:impedance thickness on the copper or trace C3:soldermask thickness on the base material CEr:dielectric constant of the soldermask
Applied for: Outer differential impedance coplanar calculation model


5．Internal impedance calculation model
H1:dielectric thickness Er1: dielectric constantH2:dielectric thickness Er2: dielectric constant W1:width at the base of the impedance line W2:width of the top impedance line T1:finished copper thickness
Applied for: Internal impedance calculation model

6.Inner differential impedance calculation model
H1:dielectric thickness Er1: dielectric constant H2:dielectric thicknessEr2: dielectric constantW1:width at the base of the impedance lineW2:width of the top impedance lineS1：impedance line spacingT1:finished copper thickness
Applied for: Inner differential impedance calculation model


7.Inner layer single impedance coplanar calculation model
H1:dielectric thicknessEr1：H1：Corresponding dielectric constant of dielectric layerH2:dielectric thicknessEr2：H2：Corresponding dielectric constant of dielectric layerW1:width at the base of the impedance lineW2:width of the top impedance lineD1：distance between impedance line and surrounding copperT1:finished copper thickness
Applied for: Inner layer single impedance coplanar calculation model


8. Inner differential impedance coplanar calculation model
H1:dielectric thicknesH2:dielectric thicknessW1:width at the base of the impedance lineW2:width of the top impedance lineS1：impedance line spacingD1：distance between impedance line and surrounding copperT1:finished copper thicknessEr1：H1：Corresponding dielectric constant of dielectric layerEr2：H2：Corresponding dielectric constant of dielectric layer
Applied for: Inner differential impedance coplanar calculation model



Fast Turn PCB is very pleased to help with your pcb design project. If you have any idea to share, please leave us a message.

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