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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： | 14/16頁 |
| 文件大小： | 244K |
| 代理商： | AD830 |
AD830
REV. A
–14–
Loop T hrough or Line Bridging Amplifier (Figure 37)
T he AD830 is ideally suited for use as a video line bridging am-
plifier. T he video signal is tapped from the conductor of the
cable relative to its shield. T he high input impedance of the
AD830 provides negligible loading on the cable. More signifi-
cantly, the benign loading is maintained while the AD830 is
powered-down. Coupled with its good video load driving per-
formance, the AD830 is well suited to video cable monitoring
applications.
4
5
3
6
AD830
1
2
8
7
A=1
V
P
0.1μF
V
OUT
V
N
0.1μF
G
M
G
M
R
G
75
75
499
499
OPTIONAL C
C
249
C
Figure 37. Cable Tap Amplifier
Resistorless Summing
Direct, two input, resistorless summing is easily realized from
the general unity gain mode. By grounding V
X 2
and applying the
two inputs to V
X 1
and V
Y1
, the output is the exact sum of the
applied voltages V
1
and V
3
, relative to common; V
OUT
= V
1
+
V
3
. A diagram of this simple, but potent application is shown
below in Figure 38. T he AD830 summing circuit possesses sev-
eral virtues not present in the classic op amp based summing
circuits. It has high impedance inputs, no resistors, very precise
summing, high reverse isolation and noninverting gain. Achiev-
ing this function and performance with op amps requires signifi-
cantly more components.
4
5
3
6
AD830
1
2
8
7
A=1
V
OUT
= V
1
+ V
3
V
P
OUT
V
N
G
M
G
M
V
1
V
3
C
Figure 38. Resistorless Summing Amplifier
2
3
Gain Bandwidth Line Driver
A gain of two, without the use of resistors, is possible with the
AD830. T his is accomplished by grounding V
X 2
, tying the two
inputs V
X 1
and V
Y1
together and applying the input, V
IN
, to this
wired connection. T he output is exactly twice the applied volt-
age, V
IN
; V
OUT
= 2
3
V
IN
. Figure 39 below shows the connec-
tions for this highly useful application. T he most notable
characteristic of this alternative gain of two is that there is no
loss of bandwidth as in a voltage feedback op amp based gain of
+2 where the bandwidth is halved, therefore, the gain band-
width is doubled. Also, this circuit is accurate without the need
for any precise valued resistors, as in the op amp equivalents,
and it possess excellent differential gain and phase performance
as shown in Figures 40 and 41.
4
5
3
6
AD830
1
2
8
7
A=1
V
P
0.1μF
V
OUT
V
N
0.1μF
G
M
G
M
75
75
V
IN
C
Figure 39. Full Bandwidth Line Driver (G = +2)
SUPPLY VOLTAGE –
±
Volts
.10
15
.03
.01
6
.02
5
.06
.04
.05
.07
.08
.09
14
13
12
11
10
9
8
7
D
D
.20
.06
.02
.04
.12
.08
.10
.14
.16
.18
PHASE
GAIN
GAIN = +2
R
L
= 150
FREQ = 3.58MHz
0 TO 0.7V
Figure 40. Differential Gain and Phase for the Circuit of
Figure 39
0.2
–0.3
–0.8
100k
100M
10M
1M
10k
–0.2
–0.1
0
0.1
–0.7
–0.6
–0.5
–0.4
FREQUENCY – Hz
A
V
S
=
±
15V
V
S
=
±
10V
V
S
=
±
5V
R
L
= 150
GAIN = +2
Figure 41. 0.1 dB Gain Flatness for the Circuit of Figure 39
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