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| 型號： | AD8027ART-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO6 |
| 封裝： | MO-178AB, SOT-23, 6 PIN |
| 文件頁數(shù)： | 21/24頁 |
| 文件大小： | 478K |
| 代理商： | AD8027ART-REEL |
AD8027/AD8028
Band-Pass Filter
Rev. B | Page 21 of 24
In communication systems, active filters are used extensively in
signal processing. The AD8027/AD8028 is an excellent choice
for active filter applications. In realizing this filter, it is impor-
tant that the amplifier has a large signal bandwidth of at least
10× the center frequency, f
O
. Otherwise, a phase shift can occur
in the amplifier, causing instability and oscillations.
In the schematic shown in Figure 62, the AD8027/AD8028 is
configured as a 1 MHz band-pass filter. The target specifications
are f
O
= 1 MHz and a –3 dB pass band of 500 kHz. Start the
design by selecting the following:
f
O
,
Q
,
C1
, and
R4.
Then using
the equations shown below, calculate the remaining variables.
The test data shown in Figure 63 indicates that this design
yielded a filter response with a center frequency f
O
= 1 MHz and
a bandwidth of 450 kHz.
(MHz)
(MHz)
Band
Pass
f
Q
O
=
k
= 2
πf
O
C1
C2
= 0.5
C1
R1
= 2/
k
,
R2
= 2/(3
k
),
R3
= 4/
k
H
= 1/3(6.5 – 1/
Q
)
R5
=
R4
/(
H
– 1)
+5
–5
C3
0.1
μ
F
C4
0.1
μ
F
R4
523
R5
523
C2
500pF
C1
1000pF
R3
634
V
OUT
R1
316
R2
105
V
IN
SELECT
AD8027/
AD8028
+
–
03327-A-061
Figure 62. Band-Pass Filter Schematic
0.1
CH1 S21 LOG
5dB/REF 6.342dB
1:6.3348dB 1.00 000MHz
1
FREQUENCY – MHz
10
1
03327-A-062
Figure 63. Band-Pass Filter Response
Design Tools and Technical Support
Analog Devices is committed to simplifying the design process
by providing technical support and online design tools. We offer
technical support via free evaluation boards, sample ICs, inter-
active evaluation tools, data sheets, spice models, application
notes, phone and email support, all of which are available at
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