TL082-Q1
JFET-INPUT OPERATIONAL AMPLIFIER
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SLOS548–SEPTEMBER 2007
6 sin ωt
1N4148
18 pF
- 15 V
18 kΩ
18 pF
(see Note A)
1 kΩ
V
CC+
-
V
CC+
88.4 kΩ
1/2
TL082
-
1/2
TL082
+
+
6 cos ωt
88.4 kΩ
V
CC-
18 pF
1 kΩ
V
CC-
15 V
1N4148
18 kΩ
88.4 kΩ
(see Note A)
A. These resistor values may be adjusted for a symmetrical output.
Figure 23. 100-kHz Quadrature Oscillator
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
1/2
TL082
-
1/2
-
1/2
TL082
Output
1/2
TL082
+
+
TL082
B
+
+
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 24. Positive-Feedback Bandpass Filter
12
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