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Principles of Analog Electronics
book

Principles of Analog Electronics

by Giovanni Saggio
January 2014
Intermediate to advanced content levelIntermediate to advanced
567 pages
23h 13m
English
CRC Press
Content preview from Principles of Analog Electronics
Principles of Analog Electronics
76
3.5 ENERGY BAND THEORY
The energy band theory provides an interest-
ing explanation of the behavior of electrons
in solids. To do an analysis, at least qualita-
tively, the analogy of the vibrant rope phe-
nomenon is applicable. Given an elastic rope
with length l, if we imagine it xed at its ends,
we can make it vibrate only with frequen-
cies f that satisfy the condition
()
/2ln
,
where n is an integer, seen in Figure 3.12.
Considering
=
λ
=
2
f
v
v
n
l
(where n = 1, 2, 3...) means that, in a xed
transmission medium, f is proportional to
the value
2
n
l
2
f
n
l
Therefore, the rope essentially can vibrate
only w
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Publisher Resources

ISBN: 9781466582026