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AD8045ACP-R2 데이터시트(PDF) 17 Page - Analog Devices

부품명 AD8045ACP-R2
상세설명  3 nV/Hz Ultralow Distortion, High Speed Op Amp
PDF  24 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD8045ACP-R2 데이터시트(HTML) 17 Page - Analog Devices

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AD8045
Rev. A | Page 17 of 24
THEORY OF OPERATION
The AD8045 is a high speed voltage feedback amplifier fabri-
cated on ADI’s second generation eXtra Fast Complementary
Bipolar (XFCB) process. An H-bridge input stage is used to
attain a 1400 V/µs slew rate and low distortion in addition to a
low 3 nV/√Hz input voltage noise. Supply current and offset
voltage are laser trimmed for optimum performance.
FREQUENCY RESPONSE
The AD8045’s open-loop response over frequency can be
approximated by the integrator response shown in Figure 63.
fCROSSOVER = 400MHz
FREQUENCY (MHz)
0
1
10
100
f
1000
VOUT/VIN =
fCROSSOVER
VIN
VOUT
Figure 63. Open-Loop Response
The closed-loop transfer function for the noninverting configu-
ration is shown in Figure 64 and is written as
()
G
CROSSOVER
G
F
F
G
CROSSOVER
IN
OUT
R
f
R
R
R
R
f
V
V
×
×
+
+
+
×
×
=
π
2
s
)
(
π
2
where:
s is (2 πj)f.
fCROSSOVER is the frequency where the amplifier’s open-loop gain
equals 1 (0 dB).
DC gain is therefore
()
G
F
G
IN
OUT
R
R
R
V
V
+
=
Closed-loop −3 dB bandwidth equals
()
F
G
G
CROSSOVER
IN
OUT
R
R
R
f
V
V
+
×
=
The closed-loop bandwidth is inversely proportional to the
noise gain of the op amp circuit, (RF + RG)/RG. This simple
model can be used to predict the −3 dB bandwidth for noise
gains above +2. The actual bandwidth of circuits with noise
gains at or below +2 is higher due to the influence of other
poles present in the real op amp.
RG
RF
VIN
VOUT
RS
+–
Figure 64. Noninverting Configuration
DC ERRORS
Figure 65 shows the dc error contributions. The total output
error voltage is
⎟
⎠
⎞
⎜
⎝
⎛
+
+
+
⎟
⎠
⎞
⎜
⎝
⎛
+
−
=
−
+
G
F
G
OS
F
B
G
F
G
S
B
(ERROR)
OUT
R
R
R
V
R
I
R
R
R
R
I
V
RG
RF
VOS
VOUT
RS
+–
IB+
IB–
Figure 65. Amplifier DC Errors
The voltage error due to IB+ and IB− is minimized if RS = RF||RG.
To include the effects of common-mode and power supply
rejection, model VOS as
CMR
V
PSR
V
V
V
CM
S
OS
OS
nom
∆
+
∆
+
=
where:
nom
os
V
is the offset voltage at nominal conditions.
ΔVS is the change in the power supply voltage from nominal
conditions.
PSR
is the power supply rejection.
CMR is the common-mode rejection.
ΔVCM is the change in common-mode voltage from nominal
conditions.



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