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| 型號： | AD8001ART-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | MB 32C 32#20 PIN PLUG |
| 中文描述： | VIDEO AMPLIFIER, PDSO5 |
| 封裝： | MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 222K |
| 代理商： | AD8001ART-REEL |
REV. C
AD8001
–11–
Printed Circuit Board Layout Considerations
As to be expected for a wideband amplifier, PC board parasitics
can affect the overall closed-loop performance. Of concern are
stray capacitances at the output and the inverting input nodes. If
a ground plane is to be used on the same side of the board as
the signal traces, a space (5 mm min) should be left around the
signal lines to minimize coupling. Additionally, signal lines
connecting the feedback and gain resistors should be short
enough so that their associated inductance does not cause high
frequency gain errors. Line lengths on the order of less than
5 mm are recommended. If long runs of coaxial cable are being
driven, dispersion and loss must be considered.
Power Supply Bypassing
Adequate power supply bypassing can be critical when optimiz-
ing the performance of a high frequency circuit. Inductance in
the power supply leads can form resonant circuits that produce
peaking in the amplifier’s response. In addition, if large current
transients must be delivered to the load, then bypass capacitors
(typically greater than 1
μ
F) will be required to provide the best
settling time and lowest distortion. A parallel combination of
4.7
μ
F and 0.1
μ
F is recommended. Some brands of electrolytic
capacitors will require a small series damping resistor
≈
4.7
for
optimum results.
DC Errors and Noise
There are three major noise and offset terms to consider in a
current feedback amplifier. For offset errors refer to the equa-
tion below. For noise error the terms are root-sum-squared to
give a net output error. In the circuit below (Figure 43) they are
input offset (V
IO
) which appears at the output multiplied by the
noise gain of the circuit (1 + R
F
/R
I
), noninverting input current
(I
BN
×
R
N
) also multiplied by the noise gain, and the inverting
input current, which when divided between R
F
and R
I
and sub-
sequently multiplied by the noise gain always appears at the
output as I
BN
×
R
F
. The input voltage noise of the AD8001 is a
low 2 nV/
√
Hz
. At low gains though the inverting input current
noise times R
F
is the dominant noise source. Careful layout and
device matching contribute to better offset and drift specifica-
tions for the AD8001 compared to many other current feedback
amplifiers. The typical performance curves in conjunction with
the equations below can be used to predict the performance of
the AD8001 in any application.
V
V
R
R
I
R
R
R
I
R
OUT
IO
F
I
BN
N
F
I
BI
F
=
×
+
±
×
×
+
±
×
1
1
R
F
R
I
R
N
I
BN
V
OUT
I
BI
Figure 43. Output Offset Voltage
Driving Capacitive Loads
The AD8001 was designed primarily to drive nonreactive loads.
If driving loads with a capacitive component is desired, best
frequency response is obtained by the addition of a small series
resistance as shown in Figure 44. The accompanying graph
shows the optimum value for R
SERIES
vs. capacitive load. It is
worth noting that the frequency response of the circuit when
driving large capacitive loads will be dominated by the passive
roll-off of R
SERIES
and C
L
.
909
V
R
SERIES
R
L
500
V
I
N
C
L
Figure 44. Driving Capacitive Loads
40
0
0
25
30
10
5
20
15
20
10
C
L
– pF
G = +1
R
S
V
Figure 45. Recommended R
SERIES
vs. Capacitive Load
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