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| 型號(hào)： | AD823 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual, 16 MHz, Rail-to-Rail FET Input Amplifier(16MHz,滿幅度,場(chǎng)效應(yīng)晶體管輸入雙運(yùn)放) |
| 中文描述： | 雙路，16兆赫，軌到軌FET輸入放大器（16MHz的，滿幅度，場(chǎng)效應(yīng)晶體管輸入雙運(yùn)放） |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大?。?/td> | 372K |
| 代理商： | AD823 |
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AD823
REV. 0
–15–
FREQUENCY – Hz
–40
H
1k
–50
–30
–60
0
–20
10k
100k
1M
10M
100M
–10
V
DB
– V
OUT
Figure 42. Frequency Response of Filter
Single-Supply Half-Wave and Full-Wave Rectifiers
An AD823 configured as a unity gain follower and operated
with a single supply can be used as a simple half-wave rectifier.
The AD823’s inputs maintain picoamp level input currents even
when driven well below the minus supply. The rectifier puts that
behavior to good use, maintaining an input impedance of over
10
11
for input voltages from 1 volt from the positive supply to
20 volts below the negative supply.
The full- and half-wave rectifier shown in Figure 43 operates as
follows: when V
IN
is above ground, R1 is bootstrapped through
the unity gain follower A1 and the loop of amplifier A2. This
forces the inputs of A2 to be equal, thus no current flows
through R1 or R2, and the circuit output tracks the input. When
V
IN
is below ground, the output of A1 is forced to ground. The
noninverting input of amplifier A2 sees the ground level output
of A1, therefore, A2 operates as a unity gain inverter. The out-
put at node C is then a full-wave rectified version of the input.
Node B is a buffered half-wave rectified version of the input.
Input voltage supply to
±
18 volts can be rectified, depending on
the voltage supply used.
10
90
100
0%
2V
2V
200
μ
s
2V
A
B
C
3
2
1
8
4
0.01
μ
F
V
IN
+V
S
1/2
AD823
HALF-WAVE
RECTIFIED OUTPUT
FULL-WAVE
RECTIFIED OUTPUT
A1
R2
100k
R1
100k
6
5
7
1/2
AD823
A2
A
B
C
Figure 43. Single Supply Half- and Full-Wave Rectifier
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