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AD825 Datasheet

  • AD825

  • Low Cost, General-Purpose High Speed JFET Amplifier

  • 1001.97KB

  • 13頁

  • AD

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AD825
Second Order Low-Pass Filter
A second order Butterworth low-pass filter can be implemented
using the AD825 as shown in Figure 28. 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.
C1
24pF
R1
9.31k
V
IN
C2
6pF
R2
9.31k
+5V
C3
0.1 F
AD825
V
OUT
C4
0.1 F
鈥?V
Figure 28. Second Order Butterworth Low-Pass Filter
C1=
HIGH FREQUENCY REJECTION 鈥?dB
1.414
2蟺
f
CUTOFF
R1
0.707
2蟺
f
CUTOFF
R1
0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
10k
100k
1M
FREQUENCY 鈥?Hz
10M
100M
C2
(
farads)
=
R1= R2
=
user selected typically10k鈩?to
100
k鈩?/div>
(
)
A plot of the filter frequency response is shown in Figure 29;
better than 40 dB of high frequency rejection is provided.
Figure 29. Frequency Response of Second Order
Butterworth Filter
鈥?0鈥?/div>
REV. C

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