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參數(shù)資料
| 型號： | AD8011* |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Micropower Op Amp, Comparator and Reference; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
| 中文描述： | 300兆赫。 1毫安電流反饋放大器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 219K |
AD8011
REV. B
–9–
THEORY OF OPERATION
The AD8011 is a revolutionary generic high-speed CF amplifier
that attains new levels of BW, power, distortion, and signal
swing capability. If these key parameters were combined as a
figure of ac merit performance or [(frequency
×
V
SIG
)/(distortion
×
power)], no IC amplifier today would come close to the merit
value of the AD8011 for frequencies above a few MHz. Its wide
dynamic performance (including noise) is the result of both a
new complementary high speed bipolar process and a new and
unique architectural design. The AD8011 uses basically a two
gain stage complementary design approach versus the traditional
“single stage” complementary mirror structure sometimes re-
ferred to as the Nelson amplifier. Though twin stages have been
tried before, they typically consumed high power since they
were of a folded cascade design much like the AD9617. This
design allows for the standing or quiescent current to add to the
high signal or slew current induced stages much like the Nelson
or single stage design. Thus, in the time domain, the large signal
output rise/fall time and slew rate is controlled typically by the
small signal BW of the amplifier and the input signal step ampli-
tude respectively, not the dc quiescent current of the gain stages
(with the exception of input level shift diodes Q1/Q2). Using
two stages vs. one also allows for a higher overall gain band-
width product (GBWP) for the same power, thus lower signal
distortion and the ability to drive heavier external loads. In
addition, the second gain stage also isolates (divides down) A3’s
input reflected load drive and the nonlinearities created result-
ing in relatively lower distortion and higher open-loop gain.
Overall, when “high” external load drive and low ac distortion is
a requirement, a twin gain stage integrating amplifier like the
AD8011 will provide superior results for lower power over the
traditional single stage complementary devices. In addition,
being a CF amplifier, closed-loop BW variations versus external
gain variations (varying RN) will be much lower compared to a
VF op amp, where the BW varies inversely with gain. Another
key attribute of this amplifier is its ability to run on a single 5 V
supply due in part to its wide common-mode input and output
voltage range capability. For 5 V supply operation, the device
obviously consumes half the quiescent power (vs. 10 V supply)
with little degradation in its ac and dc performance characteris-
tics. See data sheet comparisons.
DC GAIN CHARACTERISTICS
Gain stages A1/A1B and A2/A2B combined provide negative
feedforward transresistance gain. See Figure 28. Stage A3 is a
unity gain buffer which provides external load isolation to A2.
Each stage uses a symmetrical complementary design. (A3 is
also complementary though not explicitly shown). This is done
to both reduce second order signal distortion and overall quies-
cent power as discussed above. In the quasi dc to low frequency
region, the closed loop gain relationship can be approximated as:
G
= 1+
R
F
/
R
N
noninverting operation
G
= –
R
F
/
R
N
inverting operation
These basic relationships above are common to all traditional
operational amplifiers. Due to the inverting input error current
(I
E
) required to servo the output and the inverting I
E
×
R
I
drop
V
P
Q1
Q2
IPP
IPN
IPN
A1
V
N
Z
I
IQ1
Q3
Q4
IE
IR
–
IFC
IR + IFC
C
P
1
C
P
1
Z2
A2
C
L
R
L
ICQ
–
IO
R
F
V
O
C
D
ICQ
+ IO
–
V
I
–
V
I
V
O
IQ1
AD8011
A2
C
P
2
Z1
Z1 = R1 || C1
Z1
C
D
R
L
A1
INP
A3
Figure 28. Simplified Block Diagram
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|---|---|
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|---|---|
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