Datasheet

LOW-PASS FILTER
1/3
OPA3832
400W
400W
1.2pF
820pF
2.2pF
220pF
680pF
47.5W
124W
1/3
OPA3832
400W
560pF
110W
255W
400W
1/3
OPA3832
400W
400W
1.8pF
48.7W
95.3W
49.9W
V
OUT
V
IN
10
0
-10
-20
-30
-40
-50
-60
-70
-80
7TH-ORDERBUTTERWORTH
FILTERRESPONSE
Frequency(MHz)
Gain(dB)
0 1 10 100
OPA3832
SBOS370A – DECEMBER 2006 – REVISED AUGUST 2008 ............................................................................................................................................ www.ti.com
The circuit in Figure 54 realizes a 7th-order
Butterworth low-pass filter with a – 3dB bandwidth of
2MHz. This filter is based on the KRC active filter
topology that uses an amplifier with the fixed gain ≥
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.
Figure 54. 7th-Order Butterworth Filter
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