Differential impedance of an edge coupled stripline


Relative permitivity  
Dielectric height    μm
Conductor thickness    μm
Conductor width    μm
Side gap    μm
Differential impedance ≈     Ω
Formulas used
Zd = 120 / sqrt(<i>e<sub>r</sub></i> ) * log(1.9 * (2 * <i>h</i> + <i>t</i> ) / (0.8 * <i>w</i> + <i>t</i> )) * (1 - 0.347 * exp(-2.9 * <i>s</i> / (2 * <i>h</i> + <i>t</i> )))
    Valid for 0.1 ≤ w/h ≤ 2 and t/h ≤ 0.25
where,
	Zo	: single ended impedance
	Zd	: differential impedance
	er	: relative permitivity
	h	: height of the dielectric [μm]
	s	: side gap between the conductors [μm]
	t	: thickness of the conductor [μm]
	w	: width of the conductor [μm]

REFERENCE
  1. Brian C. Wadell, "Transmission line design handbook", Artech House, Boston, May 31 1991, ISBN 0-89006-436-9
  2. Howard Johnson, Martin Graham, "High Speed Digital Design: A Handbook of Black Magic", Prentice hall, April 18 1993, ISBN 0-13-395724-1

SEE ALSO
Online calculator - Synthesize/Analize microstrip transmission line

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