UAF42
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SBFS002B –JULY 1992–REVISED OCTOBER 2010
HP Out
BP Out
LP Out
RG
RF1
RF2
VIN
12
13
8
7
14
1
R1
50kW
R2
C1
C2
50kW
2
3
1000pF
1000pF
50kW
A1
A2
A3
R4
50kW
RQ
11
Note: If RQ = 50kW, the external Q-setting resistor
can be eliminated by connecting pin 2 to ground.
Pin numbers are for DIP
package. SOIC-16 pinout
is different.
Design Equations
R2
R1 RF1 RF2 C1 C2
R1
2
wn
1.
2.
=
4.
ALP
=
=
RG
1/2
R2
R1
R2
R4
RF1 C1
1
1
5.
AHP
ALP =
Q = 1 +
RG
RQ
R1 R2 RF2 C2
1
1
+
+
R1 R2 RG
1/2
R4
R1
R2
R1 RF1 C1
R2 RF2 C2
1
6.
ABP
=
1 +
3.
QALP = QAHP
= ABP
RQ
1
1
1
RG
+
R1 R2 RG
+
Figure 2. Inverting Pole-Pair
Copyright © 1992–2010, Texas Instruments Incorporated
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