Design Rules: Impedance & High Frequency Printed Circuit Boards

in addition to the Design Rules for Multilayer PCBs

 Measurement  Description Value [µm]
 Std. / Advanced / Limit  

 Designrules
 
  Impedance Controlled Traces

  Conductor Width
  Conductor Space

 
Copper Thickness
 
  

  > 150 / 125 / 100
  > 250 / 200 / 150

  12 or 18
 
Designrules
 
  Pattern on PTFE Outer Layers

  
 
  > 200 / 150 / 125

 Designrules
 
  Distance to Coplanar Planes

  influencing Impedance
  no influence on Impedance
  
  

  200
  More than distance to
  reference layers

Designrules
 
  Construction
 
  Clear definition of signal layers and
  reference layers
  (GND, VCC, ...)

  Mixed signals only outside RF area