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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
33-6 Electrical Variables
Two classes of low-pass lters are commonly used in making noise measurements. e rst has n real
po
les,
a
ll
w
ith
t
he
s
ame
f
requency,
h
aving
t
he
m
agnitude-squared
t
ransfer
f
unction
g
iven
b
y
| ( )|
( )
A f
A
f f
n
v
vo
/
2
2
0
2
1
=
+
(33.14)
where
f
0
is the pole frequency. e second is an n-pole Butterworth lter having the magnitude-squared
transfer function given by
| ( )|
( )
A f
A
f f
n
v
vo
/
2
2
3
2
1
=
+
(3
3
.15
)
where
f
3
is the −3 dB frequency. Table 33.1 gives the noise bandwidths as a function of the number of
poles n for 1 n 5. For the real-pole lter, B
n
is given as a function of both f
0
and f
3
. For the Butterworth
lter, B
n
is g ...
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Publisher Resources

ISBN: 9781439848913