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Network Analysis and Synthesis, 1st Edition by Pearson
book

Network Analysis and Synthesis, 1st Edition by Pearson

by S. K. Bhattacharya, Manpreet Singh
December 2015
Intermediate to advanced
737 pages
23h 39m
English
Pearson India
Content preview from Network Analysis and Synthesis, 1st Edition by Pearson
Filters and Attenuators 587
Band-stop
filter
V
o
V
i
f
f
1
f
2
Figure 13.1(d) Band-Stop Filter
13.1.1 Measurement in Decibels
The change in the output from a filter is measured in decibels (dB). The decibel is one-tenth of
a bel. Since bel is large, the unit of decibel is used. Let the output voltage of a filter unit changes
from v
1
to v
2
as the frequency changes. The change in power is expressed as the log of the ratio
of power that changes from p
1
to p
2
.
The change in power (DP) is expressed as follows:
∆P
P
P
=
log
2
1
Bel
∆P
P
P
=
10
2
1
lo
gd
B (13.1)
If power is assumed to be dissipated in the load resistance R
L
, then DP is given as in the following:
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Publisher Resources

ISBN: 9789332547261