R
4
22kΩ
C
3
R
1
V
IN
2.7kΩ
22kΩ
C
1
3000pF
10kΩ
C
2
2000pF
f
p
= 20kHz
OPA604
V
O
R
2
R
3
100pF
FIGURE 4. Three-Pole Low-Pass Filter.
R
1
V
IN
6.04kΩ
R
2
4.02kΩ
R
5
2kΩ
OPA604
V
O
C
3
1000pF
R
2
4.02kΩ
1
2
1
2
OPA2604
OPA2604
C
1
1000pF
Low-pass
3-pole Butterworth
f
–3dB
= 40kHz
R
4
5.36kΩ
See Application Bulletin AB-026
for information on GIC filters.
C
2
1000pF
FIGURE 5. Three-Pole Generalized Immittance Converter (GIC) Low-Pass Filter.
1
2
10kΩ
10kΩ
7.87kΩ
–
V
IN
+
100pF
OPA2604
OPA604
V
O
G=1
1
2
7.87kΩ
100kHz Input Filter
OPA2604
10kΩ
10kΩ
FIGURE 6. Differential Amplifier with Low-Pass Filter.
10
OPA604
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SBOS019A