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參數(shù)資料
| 型號(hào)： | AD825 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Mini size of Discrete semiconductor elements |
| 中文描述： | 迷你型離散半導(dǎo)體元件 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 700K |
| 代理商： | AD825 |
AD825
–10–
REV. D
Second Order Low-Pass Filter
A second order Butterworth low-pass filter can be implemented
using the AD825 as shown in Figure 5. The extremely low bias
currents of the AD825 allow the use of large resistor values, and
consequently small capacitor values, without concern for devel-
oping large offset errors. Low current noise is another factor in
permitting the use of large resistors without having to worry
about the resultant voltage noise.
With the values shown, the corner frequency will be 1 MHz.
The equations for component selection are shown below. Note
that the noninverting input (and the inverting input) has an
input capacitance of 6 pF. As a result, the calculated value of
C1 (12 pF) is reduced to 6 pF.
C
1
=
1.414
2
π
f
CUTOFF
R
1
C
2(
farads
)
=
0.707
2
π
f
CUTOFF
R
1
R
1
=
R
2
=
user selected typically
10
k
to
100
k
)
A plot of the filter frequency response is shown in Figure 6;
better than 40 dB of high frequency rejection is provided.
AD825
C3
0.1 F
+5V
C4
0.1 F
V
OUT
V
IN
C2
6pF
–
5V
C1
24pF
R1
9.31k
R2
9.31k
Figure 5. Second Order Butterworth Low-Pass Filter
FREQUENCY
–
Hz
10k
100M
100k
H
–
1M
10M
0
–
10
–
20
–
30
–
40
–
50
–
60
–
70
–
80
Figure 6. Frequency Response of Second Order
Butterworth Filter
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