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AD8004 датащи(PDF) 9 Page - Analog Devices

номер детали AD8004
подробное описание детали  Quad 3000 V/?? 35 mW Current Feedback Amplifier
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD8004 датащи(HTML) 9 Page - Analog Devices

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REV. C
AD8004
–9–
THEORY OF OPERATION
The AD8004 is a member of a new family of high speed current-
feedback (CF) amplifiers offering new levels of bandwidth,
distortion, and signal-swing capability vs. power. Its wide dynamic
range capabilities are due to both a complementary high speed
bipolar process and a new design architecture. The AD8004 is
basically a two stage (Figure 30) rather than the conventional
one stage design. Both stages feature the current-on-demand
property associated with current feedback amplifiers. This
gives an unprecedented ratio of quiescent current to dynamic
performance. The important properties of slew rate and full
power bandwidth benefit from this performance. In addition
the second gain stage buffers the effects of load impedance,
significantly reducing distortion.
A full discussion of this new amplifier architecture is available on
the data sheet for the AD8011. This discussion only covers the
basic principles of operation.
DC AND AC CHARACTERISTICS
As with traditional op amp circuits the dc closed-loop gain is
defined as:
A
V = G = 1 +
R
F
R
N
noninverting operation
A
V = G =−
R
F
R
N
inverting operation
The more exact relationships that take into account open-loop
gain errors are:
A
V =
G
1
+
1
− G
A
O ( s )
+
R
F
T
O ( s )
for inverting (G is negative)
A
V =
G
1
+
G
A
O ( s )
+
R
F
T
O ( s )
for noninverting (G is positive)
In these equations the open-loop voltage gain (AO(s)) is common
to both voltage and current-feedback amplifiers and is the ratio
of output voltage to differential input voltage. The open-loop
transimpedance gain (TO(s)) is the ratio of output voltage to
inverting input current and is applicable to current-feedback
amplifiers. The open-loop voltage gain and open-loop transim-
pedance gain (TO(s)) of the AD8004 are plotted vs. frequency
in TPCs 15 and 18. These plots and the basic relationships can
be used to predict the first order performance of the AD8004 over
frequency. At low closed-loop gains the term (RF/TO(s)) dominates
the frequency response characteristics. This gives the result that
bandwidth is constant with gain, a familiar property of current
feedback amplifiers.
An RF of 1 k
has been chosen as the nominal value to give
optimum frequency response with acceptable peaking at gains of
+2/–1. As can be seen from the above relationships, at higher
closed-loop gains reducing RF has the effect of increasing closed-
loop bandwidth. Table I gives optimum values for RF and RG
for a variety of gains.
VP
Q1
Q2
IPP
IPN
INP
IPN
VN
ZI
IQ1
Q3
Q4
IE
CP1
CP1
A2
CL
RG
RF
VO
CD
ICQ + IO
VO´
IQ1
AD8004
A2
CP2
CD
A3
RL
A1
A1
Z2
Figure 5. Simplified Block Diagram


Аналогичный номер детали - AD8004

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD8004 AD-AD8004 Datasheet
271Kb / 16P
   Quad 3000 V/us, 35 mW Current Feedback Amplifier
REV. B
AD8004 AD-AD8004 Datasheet
449Kb / 17P
   Current Feedback Amplifier
AD8004AN AD-AD8004AN Datasheet
271Kb / 16P
   Quad 3000 V/us, 35 mW Current Feedback Amplifier
REV. B
AD8004AN AD-AD8004AN Datasheet
715Kb / 17P
   Quad 3000 V/s, 35 mW Current Feedback Amplifier
REV. C
AD8004AN AD-AD8004AN Datasheet
648Kb / 17P
   Quad 3000 V/mu s, 35 mW Current Feedback Amplifier
REV. C
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Аналогичное описание - AD8004

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD8004 AD-AD8004_15 Datasheet
715Kb / 17P
   Quad 3000 V/s, 35 mW Current Feedback Amplifier
REV. C
AD8004 AD-AD8004 Datasheet
271Kb / 16P
   Quad 3000 V/us, 35 mW Current Feedback Amplifier
REV. B
AD8004AR AD-AD8004AR Datasheet
715Kb / 17P
   Quad 3000 V/s, 35 mW Current Feedback Amplifier
REV. C
AD8004ANZ AD-AD8004ANZ Datasheet
648Kb / 17P
   Quad 3000 V/mu s, 35 mW Current Feedback Amplifier
REV. C
AD8001ANZ AD-AD8001ANZ Datasheet
562Kb / 17P
   800 MHz, 50 mW Current Feedback Amplifier
REV. D
AD8001 AD-AD8001 Datasheet
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REV. C
AD8001ARTZ-REEL7 AD-AD8001ARTZ-REEL7 Datasheet
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   800 MHz, 50 mW Current Feedback Amplifier
REV. D
AD8001 AD-AD8001_03 Datasheet
335Kb / 16P
   800 MHz, 50 mW Current Feedback Amplifier
REV. D
AD8001ARZ AD-AD8001ARZ Datasheet
490Kb / 17P
   800 MHz, 50 mW Current Feedback Amplifier
REV. D
AD8001 AD-AD8001_15 Datasheet
562Kb / 17P
   800 MHz, 50 mW Current Feedback Amplifier
REV. D
More results


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