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| OPA3832_07 Datasheet, PDF (22/32 Pages) Burr-Brown (TI) – Triple, Low-Power, High-Speed, Fixed-Gain Operational Amplifier | |||
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OPA3832
SBOS370 â DECEMBER 2006
LOW-PASS FILTER
The circuit in Figure 54 realizes a 7th-order
Butterworth low-pass filter with a â3dB bandwidth of
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2MHz. This filter is based on the KRC active filter
topology that uses an amplifier with the fixed gain â¥
1. The OPA3832 makes a good amplifier for this type
of filter. The component values have been adjusted
to compensate of the parasitic effects of the op amp.
47.5W
VIN
124W
1.2pF
49.9W
2.2pF
110W
255W
560pF
820pF
1/3
OPA3832
220pF
1/3
OPA3832
400W
400W
400W
400W
10
0
-10
-20
-30
-40
-50
-60
-70
-80
0
7TH-ORDER BUTTERWORTH
FILTER RESPONSE
48.7W
95.3W
680pF
1.8pF
1/3
OPA3832
400W
400W
1
10
100
Frequency (MHz)
VOUT
Figure 54. 7th-Order Butterworth Filter
22
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