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參數(shù)資料
| 型號： | AD5539 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultrahigh Frequency Operational Amplifier(超高頻率運算放大器) |
| 中文描述： | 超高頻率運算放大器（超高頻率運算放大器） |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 499K |
| 代理商： | AD5539 |
AD5539
–15–
REV. B
T he transient response of the signal channel at V
X
= +2 V,
V
Y
= V
OUT
= + or –1 V is shown in Figure 46; with the VCA
driving a 75
load. T he rise and fall times are both approxi-
mately 7 ns.
A few final circuit details: in general, the control amplifier com-
pensation capacitor for Pin 2, C
C
, must have a minimum value
of 3000 pF (3 nF) to provide both circuit stability and maximum
control bandwidth. However, if the
maximum
control bandwidth
is not needed, then it is advisable to use a larger value of C
C
,
with typical values between 0.01 and 0.1
μ
F. Like many aspects
of design, the value of C
C
will be a tradeoff: higher values of C
C
will lower the high frequency distortion, reduce the high fre-
quency crosstalk and improve the signal channel phase response.
Conversely, lower values of C
C
will provide a higher control
channel bandwidth at the expense of degraded linearity in the
output response when amplitude modulating a carrier signal.
T he control channel bandwidth will vary in inverse proportion to
the value of C
C
, providing a typical bandwidth of 2 MHz with a
C
C
of 0.01
μ
F and a V
X
voltage of +1.7 volts.
Both the bandwidth and pulse response of the control channel
can be further increased by using a feedforward capacitor, C
ff
,
with a value between 5 and 20 percent of C
C
. C
ff
should be care-
fully adjusted to give the best pulse response for a particular step
input applied to the control channel. Note that since C
ff
is con-
nected between a linear control input (Pin 1) and a logarith-
Figure 46. Transient Response of the Voltage-Controlled
Amplifier V
X
= +2 Volts, V
Y
=
±
1 Volt
mic node, the settling time of the control channel with a pulse
input will vary with different control input step levels.
Diode D1 clamps the logarithmic control node at Pin 2 of the
AD539, (preventing this point from going too negative); this
diode helps decrease the circuit recovery time when the control
input goes below ground potential.
T HE AD539/5539 COMBINAT ION AS A FAST , LOW
FE E DT HROUGH, VIDE O SWIT CH
Figure 47 shows how the AD539/5539 combination can be used
to create a fast video speed switch suitable for many high fre-
Figure 47. An Analog Multiplier Video Switch
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD5547 | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5547BRU | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5547BRU-REEL7 | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5557 | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5557CRU | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5539J | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrahigh Frequency Operational Amplifier |
| AD5539JN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| AD5539JQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD5539S | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrahigh Frequency Operational Amplifier |
| AD5539SQ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrahigh Frequency Operational Amplifier |
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