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參數(shù)資料
| 型號： | AD8004 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Quad Current Feedback Amplifier(電流反饋四路放大器) |
| 中文描述： | 四電流反饋放大器（電流反饋四路放大器） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 291K |
| 代理商： | AD8004 |
AD8004
REV. A
–9–
T HE ORY OF OPE RAT ION
T he 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. T he 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. T his gives
an unprecedented ratio of quiescent current to dynamic perfor-
mance. T he 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 sig-
nificantly reducing distortion.
A full discussion of this new amplifier architecture is available
on the data sheet for the AD8011. T his discussion only covers
the basic principles of operation.
DC AND AC CHARACT E RIST ICS
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
T he 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 (A
O
(s)) is com-
mon to both voltage and current-feedback amplifiers and is the
ratio of output voltage to differential input voltage. T he open-
loop transimpedance gain (T
O
(s)) is the ratio of output voltage
to inverting input current and is applicable to current-feedback
amplifiers. T he open-loop voltage gain and open-loop transim-
pedance gain (T
O
(s)) of the AD8004 are plotted vs. frequency
in Figures 20 and 31. T hese 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 (R
F
/T
O
(s))
dominates the frequency response characteristics. T his gives the
result that bandwidth is constant with gain, a familiar property
of current feedback amplifiers.
An R
F
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 R
F
has the effect of increasing closed-
loop bandwidth. T able I gives optimum values for R
F
and R
G
for a variety of gains.
Figure 30. Simplified Block Diagram
V
P
Q1
Q2
IPP
IPN
INP
IPN
V
N
A1
Z
I
IQ1
Q3
Q4
IE
C
P
1
C
P
1
Z2
A2
C
L
R
G
R
F
V
O
C
D
ICQ +
IO
V
O
′
IQ1
AD8004
A2
C
P
2
C
D
A3
R
L
A1
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