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

All-Pass Filter Design
16-46
V IN
f C T gr0
t gr0
1.087 kHz
To complete the design, look up the filter coefficients for a seventh-order all-pass filter,
specify C, and calculate the resistor values for each partial filter.
Cascading the first-order all-pass with the three second-order stages results in the desired
seventh-order all-pass filter.
R 11
R 1
R 12
R 13
R 14
Figure 16–45. Seventh-Order All-Pass Filter
R 11
C 1
C 2
C 2 R 22
C 3
C 3 R 23
C 4
C 4 R 24
R 32
R 2
R 33
R 3
R 34
R 4
R 2
R 3
R 4
V OUT