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參數(shù)資料
| 型號： | AD811ARZ-16 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO OPAMP HP 16-SOIC |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 應(yīng)用： | 電流反饋 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 140MHz |
| 轉(zhuǎn)換速率： | 2500 V/µs |
| 電流 - 電源： | 16.5mA |
| 電流 - 輸出 / 通道： | 100mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 18 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 768 (CN2011-ZH PDF) |
Data Sheet
AD811
Rev. F | Page 15 of 20
AN 80 MHZ VOLTAGE-CONTROLLED AMPLIFIER
CIRCUIT
The voltage-controlled amplifier (VCA) circuit of Figure 46 shows
multiplier. The AD834 multiplies the signal input by the dc control
currents from a pair of open collectors, ensuring 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 VG = 0 V to +12 V (a numerical gain of
+4) when VG = 1 V. The overall transfer function of the VCA is
VOUT = 4 (X1 X2)(Y1 Y2), which reduces to VOUT = 4 VG VIN
using the labeling conventions shown in Figure 46. The circuit’s
3 dB bandwidth of 80 MHz is maintained essentially constant—
that is, independent of gain. The 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. The 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.
The 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 approximately 25 MHz. The maximum output voltage under
these conditions is increased to ±9 V using ±12 V supplies.
The gain-control input voltage, VG, may be a positive or negative
ground-referenced voltage, or fully differential, depending on
the choice of connections at Pin 7 and Pin 8. A positive value of
VG results in an overall noninverting response. Reversing the sign
of VG 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 capabilities and fully
symmetrical responses from the X and Y inputs.
The AD811 and AD834 can both be operated from power supply
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 input
stage of the AD811. To achieve the lowest differential gain and
phase errors, it is recommended that the AD811 be operated
from power supply voltages of ±10 V or greater. This VCA
circuit operates from a ±12 V dual power supply.
Figure 46. An 80 MHz Voltage-Controlled Amplifier
X2
X1 +VS
W1
Y1
Y2
W2
–VS
U1
AD834
U3
AD811
R4
182
R5
182
R1 100
R2 100
R3
249
R6
294
R7
294
R9*
R8*
RL
FB
C2
0.1
F
C1
0.1
F
–12V
VOUT
FB
+12V
VG
VIN
*R8 = R9 = 511
FOR ×4 GAIN
R8 = R9 = 1.27k
FOR ×10 GAIN
+
–
1
2
3
4
8
7
6
5
7
6
4
3
2
+
–
00866-E-047
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