Analog and Digital Filters
579
FIGURE 6.17
(See color insert following page 374.) Magnitude plots of normalized analog Bessel LPFs of orders n = 1, 2, 3,
4, and 10.
0
2
4
6
0
0.2
0.4
0.6
0.8
1
n = 1
n = 3
n = 10
n = 4
Bessel magnitude LPF/order n = 1 , 2, 3, 4, 10
Normalized frequency
Gain
n = 2
FIGURE 6.18
(See color insert following page 374.) Phase plots of normalized analog Bessel LPFs of orders n = 1, 2, 3, 4,
and 10.
0
0.5
1
−3
−2
−1
0
1
2
3
Normalized frequency
Phase in radian
Bessel phase LPF/order n = 1, 2, 3, 4, 10
n = 3
n = 2
n = 1
n = 10
n = 4
CRC_47760_CH006.indd 579
CRC_47760_CH006.indd 579
7/23/2008 2:26:35 PM
7/23/2008 2:26:35 PM