PCB走线阻抗的计算

http://emclab.mst.edu/pcbtlc2/index.html

xgbing

12341人浏览 · 2014-09-01 21:38:17

xgbing · 2014-09-01 21:38:17 发布

http://emclab.mst.edu/pcbtlc2/index.html

PCB Trace Impedance Calculator

Calculates the characteristic impedance and per-unit-length parameters
of typical printed circuit board trace geometries.

Select a configuration:

Microstrip Trace

Embedded Microstrip Trace

Stripline Trace

Dual Stripline Trace

Geometric Parameter Definitions:

W:		trace width
T:		trace thickness
H (/H1)		height of trace or dielectric above return plane
C:		distance between the differential stripline pair
εr:		relative permittivity of the dielectric

Electrical Parameter Definitions:

Zo:		characteristic impedance
Zc:		effective characteristic impedance including the capacitance of distributed loads
Tpd:		propagation delay
Lo:		inductance per unit length
Co:		capacitance per unit length

Acknowledgements:

The source for formulas used in this calculator (except where otherwise noted) is the Design Guide for Electronic Packaging Utilizing High-Speed Techniques (4th Working Draft, IPC-2251, February 2001.

THESE FORMULAS ARE APPROXIMATIONS! They should not be used when a high degree of accuracy is required.

This transmission line calculator was based on a concept developed by Douglas Brooks of UltraCAD Design, Inc.

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