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Date: | Fri, 07 Jul 95 16:25:08 EST |
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Here is something that I wrote for one of our internal
newsletters a while ago:
"Technically speaking, "impedance" is the total opposition to
alternating current (AC) flow by a circuit. Impedance is
measured in "ohms", just like resistors (typical values are at
about 50 - 75 ohms). It becomes important in high speed
electronic equipment when the signals of various components of a
circuit must be synchronized. The circuits in the equipment can
slow down the signals, relative to other circuit devices, unless
synchronization is done by controlling the impedance. Design
engineers therefore choose a critical region (or regions) of the
circuit to have a controlled impedance range which the
manufacturer must meet. This brings the printed circuit board
into a more active role, instead of the passive role it has had
as a mounting board and connector for the components."
I hope it helps.
Matt Byrne
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______________________________ Reply Separator _________________________________
Subject: Controlled Impedance
Author: [log in to unmask] at SMTPLINK-HADCO
Date: 7/7/95 12:31 PM
Does anyone out there have a simple, non-technical definition
of controlled impedance? We are having some difficulty
explaining satisfactorily to some management types.
Thanks,
Bob Smith
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