June 2003
Intermediate to advanced
432 pages
8h 47m
English
Content preview from Signal Integrity Issues and Printed Circuit Board DesignBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 2. Propagation Times
Propagation Speed
Electrical signals traveling along a wire or trace in the air travel at the speed of light, 186,280 miles per second (which, if you do the arithmetic, works out to 11.8 in/ns). That speed is equivalent to 7.5 trips around the Earth’s equator in one second. Yet we need to worry about how fast these signals travel along traces on our boards! That is pretty amazing when you think about it.
Consider this experiment: String a copper wire in the air across a lake and measure the time it takes a signal to travel from one end of the wire to the other end. Now lower the wire into the lake and measure the signal propagation time again. What do you think happens to the propagation time?
When a current flows along ...
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