ꢀ
ꢁ
ꢂ
ꢃꢄ
ꢅ
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ꢁ
ꢂ
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ꢆ
ꢅ
ꢀꢁ
ꢂ
ꢃ
ꢄꢇ
ꢅ
ꢀꢁ
ꢂ
ꢃ
ꢈꢅ
ꢀ
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ꢂ
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ꢈꢆ
ꢅ ꢀ ꢁꢂ ꢃ ꢈ ꢇ
ꢀ
ꢁ
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ꢃ
ꢉꢇ
ꢊ
ꢋ
ꢌ
ꢀꢍ
ꢎ
ꢏ
ꢐ
ꢑ
ꢀ
ꢒ
ꢐ
ꢌ
ꢓ
ꢆꢀ
ꢎ
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SLOS081G − FEBRUARY 1977 − REVISED SEPTEMBER 2004
APPLICATION INFORMATION
16 kΩ
16 kΩ
220 pF
220 pF
43 kΩ
30 kΩ
43 kΩ
30 kΩ
V
V
CC+
CC+
43 kΩ
Input
220 pF
220 pF
V
V
CC+
CC+
−
−
43 kΩ
43 kΩ
43 kΩ
−
1/4
−
1/4
TL084
1/4
TL084
Output
B
1/4
TL084
+
+
TL084
+
+
1.5 kΩ
1.5 kΩ
V
CC−
V
CC−
V
CC−
V
CC−
Output A
Output A
Output B
2 kHz/div
Second-Order Bandpass Filter
= 100 kHz, Q = 30, GAIN = 4
2 kHz/div
Cascaded Bandpass Filter
f = 100 kHz, Q = 69, GAIN = 16
o
f
o
Figure 27. Positive-Feedback Bandpass Filter
16
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
