"Chapter 1 - The Op Amp's Place in the World" - HTL Wien 10

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