Microstrip Zd

Microstrip Zd Calculator

microstrip Zdiff impedance diagram


Trace Thickness
Substrate Height
Trace Width
Trace Spacing
Substrate Dielectric

Output ⊕

Differential impedance (Zd): 
156 Ω
Single ended impedance (Zo): 
138 Ω

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:-

  • Trace thickness (t)
  • Substrate height (h)
  • Trace width (w)
  • Trace spacing (s)
  • Substrate dielectric (εr)

Z_{d}\approx \frac{174}{\sqrt{\varepsilon_{r}+1.41}}\times\ln\bigg(\frac{5.98h}{(0.8w+t)}\bigg)\times \bigg[1-0.48\;exp\Big(-0.96\frac{s}{h}\Big)\bigg]

  • 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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