Inductance

Write me endeavor

Bogatin Enterprises, LLC

Dr. Eric Bogatin
26235 W 110th Terr.
Olathe, KS 66061
Voice: 913-393-1305
Fax: 913-393-1306
eric@bogent.com
www.BogatinEnterprises.com

Training by reason of Signal Integrity and Interconnect Design

What Really Is Inductance?
By
Dr. Eric Bogatin
Bogatin Enterprises
Oct 30, 1999
Reprinted with permission from PCB Design Magazine, March 2000
Introduction
There is not a uncorrupt person involved with signal integrity and interconnect
design who has not used the limit inductance at one time or some other. Yet, very
few engineers use the bourn correctly. This is fundamentally due to the street we all
learned about inductance in superior school or college physics or electrical
engineering.
Traditionally, we deep-read about inductance and how it of the same family to flux lines in
coils. Or we deep-read about integrals involving magnetic field densities. While completely
of these explanations may be exactly true, it doesn't help us in c~tinuance a practical
level. How many boards have you designed that have coils in them? We desire
not been trained to apply the concepts of inductance to the applications we meet in front
daily, related to interconnects in packages, connectors or the stage. If you really
want to mean what inductance is, at an perceived at once level, and use it to relieve
improve the performance of your products, slight what you've been taught in
academy, and read on.
Counting Field Lines
First, confess that there is this fundamental entity, called magnetic field lines
that surrounds each current. If you have a right wire, colored red, for
example, and launch a current, like 1 Amp, from one side it, there will be concentric
round magnetic field lines created around the metallic thread, as illustrated in figure 1.
You can imagine walking along the red wire and counting the specific number of
opportunity lines that completely surround it.

serving-boy - 2 of 10

Current

section of convey by electric telegraph
Figure 1 Surrounding a current carrying conductor are concentric circular
magnetic field...

Make my struggle