PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

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.

0246

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