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參數資料
| 型號： | AD830 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | High Speed, Video Difference Amplifier(高速,視頻差分運放) |
| 中文描述： | 高速，視頻差分放大器（高速，視頻差分運放） |
| 文件頁數： | 15/16頁 |
| 文件大小： | 244K |
| 代理商： | AD830 |
AD830
REV. A
–15–
AC COUPLE D LINE RE CE IVE R
T he AD830 is configurable as an ac coupled differential ampli-
fier on a single or bipolar supply voltages. All that is needed is
inclusion of a few noncritical passive components as illustrated
below in Figure 42. A simple resistive network at the X G
M
input establishes a common-mode bias. Here, the common
mode is centered at 6 volts, but in principle can be any voltage
within the common-mode limits of the AD830. T he 10 k
re-
sistors to each input bias the X G
M
stage with sufficiently high
impedance to keep the input coupling corner frequency low, but
not too large so that residual bias current induced offset voltage
becomes troublesome. For dual supply operation, the 10 k
resistors may go directly to ground. T he output common is con-
veniently set by a Zener diode for a low impedance reference to
preserve the high frequency CMR. However, a simple resistive
divider will work fine and good high frequency CMR can be
maintained by placing a compensating resistor in series with the
+Y input. T he excellent CMRR response of the circuit is shown
in Figure 43. A plot of the 0.1 dB flatness from 10 Hz is also
shown. With the use of 10
μ
F capacitors, the CMR is >90 dB
down to a few tens of hertz. T his level of performance is almost
impossible to achieve with discrete solutions.
4
5
3
6
AD830
1
2
8
7
A=1
Z
CM
+12V
0.1μF
V
OUT
G
M
G
M
75
75
1000μF
75
COAX
CABLE
+12V
4.7k
6.8V
1N4736
+V
S
10k
10k
10μF
10μF
R
T
10k
10k
2k
*
*OPTIONAL TUNING FOR
IMPROVING VERY LOW
FREQUENCY CMR.
C
INPUT
SIGNAL
Figure 42. AC Coupled Line Receiver
120
100
20
10
100
100M
10M
1M
100k
10k
1k
80
60
40
FREQUENCY – Hz
C
WITH CIRCUIT TRIMMED
USING EXTERNAL 2k
POTENTIOMETER
WITHOUT EXTERNAL
2k
POTENTIOMETER
Figure 43. Common-Mode Rejection vs. Frequency for
Line Receiver
1
–0.4
–0.9
10
100
10M
1M
100k
10k
1k
–0.3
–0.2
–0.1
0
–0.8
–0.7
–0.6
–0.5
A
FREQUENCY – Hz
Figure 44. Amplitude Response vs. Frequency for Line
Receiver
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