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AD825 Datenblatt(PDF) 10 Page - Analog Devices

Teilenummer AD825
Bauteilbeschribung  Low Cost, General Purpose High Speed JFET Amplifier
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD825 Datenblatt(HTML) 10 Page - Analog Devices

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AD825
–10–
REV. C
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
=
1.414
2
π f
CUTOFF R1
C2( farads)
=
0.707
2
π f
CUTOFF R1
R1
= R2 = user selected typically10kΩ to100 kΩ
()
A plot of the filter frequency response is shown in Figure 29;
better than 40 dB of high frequency rejection is provided.
AD825
C3
0.1 F
+5V
C4
0.1 F
VOUT
VIN
C2
6pF
–5V
C1
24pF
R1
9.31k
R2
9.31k
Figure 28. Second Order Butterworth Low-Pass Filter
FREQUENCY – Hz
10k
100M
100k
1M
10M
0
–10
–20
–30
–40
–50
–60
–70
–80
Figure 29. Frequency Response of Second Order
Butterworth Filter


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