Biomedical Engineering Reference
In-Depth Information
and
1
100
1
C
¼
R
a
¼
4000
¼
2
:
5
m
F
100
A plot of the magnitude versus frequency is shown in the following figure. As can be seen, the
cutoff frequency gives a value of magnitude equal to 3.53 at 100 Hz, which is the design goal.
6
5
4
3
2
1
0
0
200
400
600
800
1000
1200
1400
Frequency (rad/s)
Example Problem 9.30 demonstrates the technique to create band-pass filters (which
require two cutoff frequencies).
EXAMPLE PROBLEM 9.30
Using the band-pass filter in the following circuit, design the filter to have a gain of 5 and pass
through frequencies from 100 to 500
rad
s
.
C
L
R
b
L
R
b
H
−
R
a
L
+
+
R
a
H
+
+
V
S
C
H
−
v
L
v
0
−
−
Continued