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參數(shù)資料
| 型號(hào)： | AD811 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Performance Video Op Amp(高性能視頻運(yùn)放) |
| 中文描述： | 高性能視頻運(yùn)算放大器（高性能視頻運(yùn)放） |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 286K |
| 代理商： | AD811 |
AD811
REV. C
–12–
An 80 MHz Voltage-Controlled Amplifier Circuit
T he voltage-controlled amplifier (VCA) circuit of Figure 40
shows the AD811 being used with the AD834, a 500 MHz,
4-quadrant multiplier. T he AD834 multiplies the signal input
by the dc control voltage, V
G
. T he AD834 outputs are in the
form of differential currents from a pair of open collectors, en-
suring that the full bandwidth of the multiplier (which exceeds
500 MHz) is available for certain applications. Here, the
AD811 op amp provides a buffered, single-ended ground-
referenced output. Using feedback resistors R8 and R9 of
511
, the overall gain ranges from –70 dB, for V
G
= 0 dB to
+12 dB, (a numerical gain of four), when V
G
= +1 V. T he over-
all transfer function of the VCA is:
V
OUT
= 4 (
X
1 –
X
2)(
Y
1 –
Y
2)
which reduces to V
OUT
= 4 V
G
V
IN
using the labeling conven-
tions shown in Figure 40. T he circuit’s –3 dB bandwidth of
80 MHz, is maintained essentially constant—independent of
gain. T he response can be maintained flat to within
±
0.1 dB
from dc to 40 MHz at full gain with the addition of an optional
capacitor of about 0.3 pF across the feedback resistor R8. T he
circuit produces a full-scale output of
±
4 V for a
±
1 V input,
and can drive a reverse-terminated load of 50
or 75
to
±
2 V.
T he gain can be increased to 20 dB (
×
10) by raising R8 and R9
to 1.27 k
, with a corresponding decrease in –3 dB bandwidth
to about 25 MHz. T he maximum output voltage under these
conditions will be increased to
±
9 V using
±
12 V supplies.
T he gain-control input voltage, V
G
, may be a positive or nega-
tive ground-referenced voltage, or fully differential, depending
on the user’s choice of connections at Pins 7 and 8. A positive
value of V
G
results in an overall noninverting response. Revers-
ing the sign of V
G
simply causes the sign of the overall response
to invert. In fact, although this circuit has been classified as a
voltage-controlled amplifier, it is also quite useful as a general-
purpose four-quadrant multiplier, with good load-driving capa-
bilities and fully-symmetrical responses from X - and Y-inputs.
T he AD811 and AD834 can both be operated from power sup-
ply voltages of
±
5 V. While it is not necessary to power them
from the same supplies, the common-mode voltage at W1 and
W2 must be biased within the common-mode range of the
AD811’s input stage. T o achieve the lowest differential gain and
phase errors, it is recommended that the AD811 be operated
from power supply voltages of
±
10 volts or greater. T his VCA
circuit is designed to operate from a
±
12 volt dual power
supply.
1
2
3
4
8
7
6
5
X2
X1
+V
S
W1
Y1
Y2
W2
–V
S
U1
AD834
7
6
4
3
2
U3
AD811
R4
182
R5
182
R1 100
R2 100
R3
249
R6
294
R7
294
R9*
R8*
0C1
R
L
FB
0C2
–12V
V
OUT
FB
+12V
V
G
V
IN
*R8 = R9 = 511 FOR X4 GAIN
= 1.27k FOR X10 GAIN
+
–
Figure 40. An 80 MHz Voltage-Controlled Amplifier
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| AD811_04 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Performance Video Op Amp |
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| AD8110ASTZ | 制造商:Analog Devices 功能描述:Analog Crosspoint Switch IC |
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