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| 型號： | AD8001ART-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | MB 32C 32#20 SKT PLUG |
| 中文描述： | VIDEO AMPLIFIER, PDSO5 |
| 封裝： | MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 222K |
| 代理商： | AD8001ART-REEL7 |
REV. C
AD8001
–10–
THEORY OF OPERATION
A very simple analysis can put the operation of the AD8001, a
current feedback amplifier, in familiar terms. Being a current
feedback amplifier, the AD8001’s open-loop behavior is ex-
pressed as transimpedance,
V
O
/
I
–IN
, or T
Z
. The open-loop
transimpedance behaves just as the open-loop voltage gain of a
voltage feedback amplifier, that is, it has a large dc value and
decreases at roughly 6 dB/octave in frequency.
Since the R
IN
is proportional to 1/g
M
, the equivalent voltage
gain is just T
Z
×
g
M
, where the g
M
in question is the trans-
conductance of the input stage. This results in a low open-loop
input impedance at the inverting input, a now familiar result.
Using this amplifier as a follower with gain, Figure 40, basic
analysis yields the following result.
V
V
G
T
S
×
T
G
R
R
G
R
R
R
g
O
IN
Z
Z
IN
IN
M
=
×
+
+
=
+
=
≈
( )
(S
/
1
1
1
2
1
50
Recognizing that
G
×
R
IN
<<
R
1 for low gains, it can be seen to
the first order that bandwidth for this amplifier is independent
of gain (G). This simple analysis in conjunction with Figure 41
can, in fact, predict the behavior of the AD8001 over a wide
range of conditions.
V
OUT
R1
R2
R
IN
V
IN
Figure 40.
Considering that additional poles contribute excess phase at
high frequencies, there is a minimum feedback resistance below
which peaking or oscillation may result. This fact is used to
determine the optimum feedback resistance, R
F
. In practice
parasitic capacitance at Pin 2 will also add phase in the feedback
loop, so picking an optimum value for R
F
can be difficult. Fig-
ure 42 illustrates this problem. Here the fine scale (0.1 dB/div)
flatness is plotted vs feedback resistance. These plots were taken
using an evaluation card which is available to customers so that
these results may readily be duplicated (see Evaluation Board
section).
Achieving and maintaining gain flatness of better than 0.1 dB at
frequencies above 10 MHz requires careful consideration of
several issues.
FREQUENCY – Hz
1M
10
100k
1M
1G
100M
10M
100
100k
10k
1k
T
Z
V
Figure 41. Transimpedance vs. Frequency
O
0.1
0
–0.9
1M
10M
100M
–0.1
–0.2
–0.3
–0.4
–0.5
FREQUENCY – Hz
–0.6
–0.7
–0.8
G = +2
R
F
=
649
V
R
F
= 698
V
R
F
= 750
V
Figure 42. 0.1 dB Flatness vs. Frequency
Choice of Feedback and Gain Resistors
Because of the above-mentioned relationship between the band-
width and feedback resistor, the fine scale gain flatness will, to
some extent, vary with feedback resistance. It, therefore, is
recommended that once optimum resistor values have been
determined, 1% tolerance values should be used if it is desired
to maintain flatness over a wide range of production lots. In
addition, resistors of different construction have different associ-
ated parasitic capacitance and inductance. Surface mount resis-
tors were used for the bulk of the characterization for this data
sheet. It is not recommended that leaded components be used
with the AD8001.
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