Spacing from Zo/Zd

Spacing from Zo/Zd Calculator

microstrip spacing from Zo and Zdiff impedance diagram

Inputs

Single Ended Impedance
Zo
Ω
Differential Impedance
Zd
Ω
Substrate Height
h
Trace Spacing Unit
s

Output

Trace Spacing (s): 
11.2 mil

View Notes

Calculation Notes


The differential microstrip is a common technique for routing differential traces. A differential microstrip is constructed with two traces referenced to the same reference plane.

Factors that influence the impedance calculation include:-

  • Single ended impedance (Zo)
  • Differential impedance (Zd)
  • Substrate height (h)

Z_{d}\approx 2\times Z_{o}\times \bigg[1-0.48\;exp\Big(-0.96\;\frac{s}{h}\Big)\bigg]


References:
  • RF Design Guide Systems, Circuits and Equations (ISBN 0-89006-754-6)
  • High-Speed Digital Design (ISBN 0-13-395724-1)
  • Signal Integrity Issues and Printed Circuit Board Design (ISBN 0-13-335947-6)
  • IPC-2141 Controlled Impedance Circuit Boards and High Speed Logic Design

Disclaimer: The information and this tool are provided with no liability of any kind whatsoever, use at your own risk.

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