HP Out
RF1
BP Out
RF2
LP Out
PP3
C1A
C2A
RG
R2A
VIN
12
13
8
7
14
1
R1
50kΩ
C1
R2
50kΩ
C2
1000pF
A2
1000pF
A1
A3
3
R4
50kΩ
RQ
UAF42
11
NOTE: If RQ = 50kΩ when using the PP3 subcircuit, you can
eliminate the external Q-setting resistor by connecting R3 as shown
in Figure 9B.
FIGURE 9A. PP3 Inverting Pole-Pair Subcircuit.
HP Out
RF1
BP Out
RF2
LP Out
C1A
C2A
RG
R2A
VIN
12
13
8
7
14
1
R1
50kΩ
C1
R2
50kΩ
C2
1000pF
A2
1000pF
A1
A3
R3
50kΩ
R4
50kΩ
2
UAF42
11
FIGURE 9B. Inverting Pole-Pair Subcircuit Using R3 to Eliminate External Q-Setting Resistor RG.
6