PP3
R
G
V
IN
12
13
R
2A
HP Out
R
F1
C
1A
BP Out
R
F2
C
2A
LP Out
8
R
1
50kΩ
7
14
1
R
2
50kΩ
C
1
1000pF
C
2
1000pF
3
A
1
R
4
50kΩ
A
2
A
3
R
Q
11
UAF42
NOTE: If R
Q
= 50kΩ when using the PP3 subcircuit, you can
eliminate the external Q-setting resistor by connecting R
3
as shown
in Figure 9B.
FIGURE 9A. PP3 Inverting Pole-Pair Subcircuit.
HP Out
R
G
V
IN
12
13
8
R
1
50kΩ
R
2
50kΩ
C
1
1000pF
7
R
2A
R
F1
C
1A
BP Out
R
F2
C
2A
LP Out
14
1
C
2
1000pF
A
1
R
3
50kΩ
R
4
50kΩ
A
2
A
3
2
UAF42
11
FIGURE 9B. Inverting Pole-Pair Subcircuit Using R
3
to Eliminate External Q-Setting Resistor R
G
.
6