On Wed, 15 May 1996, Microsoft Windows wrote:

> Would like to ask for some help on getting some definitions. I am looking for a simple definition for inductance and characteristic impedance. I am presenting to a group that is new to CI and would like to keep things simple and easy to understand.
> 
> Thank you in advance
> 
> 

>From IPC-D-316 (Microwave Design)

"Characteristic Impedance (Zo):  For a uniform transmission line of any 
length, the ratio of inductance per unit length to capacitance per unit 
length.  A 50 ohm characteristic impedance is often used because it 
matches that of most test instrumentation.  When a signal propagating 
along a transmission line encounters a change in Zo, scattering of the 
signal will occur, that is, some of the signal will be reflected 
backwards along the line."

>From IPC-D-317A (High Speed Design)

"Inductance - The property of a conductor that allows it to store energy 
in a magnetic field induced by a current flowing through it.  Units of 
measure:  Henry."


Regards

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David W. Bergman, Technical Director
IPC
2215 Sanders Road
Northbrook, IL  60062-6135
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847-509-9798 Fax
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