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Fundamentals of Low-Pass Filters
0
φ — Phase — degrees
–90
–180
–270
Bessel
Butterworth
Tschebyscheff
–360
0.01 0.1 1 10
Frequency — Ω
100
Figure 16–7. Comparison of Phase Responses of Fourth-Order Low-Pass Filters
1.4
T gr — Normalized Group Delay — s/s
1.2
1
0.8
0.6
0.4
0.2
Tschebyscheff
Bessel
Butterworth
0
0.01 0.1 1 10
Frequency — Ω
100
Figure 16–8. Comparison of Normalized Group Delay (Tgr) of Fourth-Order Low-Pass Filters
16-8