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AD8045ACP-REEL7 Datasheet

  • AD8045ACP-REEL7

  • Analog Devices [3 nV/Hz Ultralow Distortion, High Speed Op ...

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AD8045
THEORY OF OPERATION
The AD8045 is a high speed voltage feedback amplifier fabri-
cated on ADI鈥檚 second generation eXtra Fast Complementary
Bipolar (XFCB) process. An H-bridge input stage is used to
attain a 1400 V/碌s slew rate and low distortion in addition to a
low 3 nV/鈭欻z input voltage noise. Supply current and offset
voltage are laser trimmed for optimum performance.
R
S
V
IN
+ V
OUT
鈥?/div>
R
F
R
G
04814-0-009
FREQUENCY RESPONSE
The AD8045鈥檚 open-loop response over frequency can be
approximated by the integrator response shown in Figure 63.
Figure 64. Noninverting Configuration
DC ERRORS
V
IN
V
OUT
Figure 65 shows the dc error contributions. The total output
error voltage is
V
OUT
/V
IN
(dB)
鈳?/div>
R
+
R
鈳?/div>
鈳?/div>
R
+
R
鈳?/div>
V
OUT (ERROR)
= 鈭?/div>
I
B
+
R
S
鈳?/div>
G F
鈳?+
I
B
鈭?/div>
R
F
+
V
OS
鈳?/div>
G F
鈳?/div>
鈳?/div>
R
G
鈳?/div>
鈳?/div>
R
G
鈳?/div>
R
S
V
OS
I
B
+
I
B
鈥?/div>
04814-0-008
V
OUT
/V
IN
=
f
CROSSOVER
f
10
100
FREQUENCY (MHz)
f
CROSSOVER
= 400MHz
+ V
OUT
鈥?/div>
0
1
1000
R
F
R
G
04814-0-010
Figure 63. Open-Loop Response
The closed-loop transfer function for the noninverting configu-
ration is shown in Figure 64 and is written as
Figure 65. Amplifier DC Errors
2 蟺
脳
f
CROSSOVER
脳
(
R
G
+
R
F
)
V
OUT
=
(
R
F
+
R
G
)
s
+
2 蟺
脳
f
CROSSOVER
脳
R
G
V
IN
where:
s
is (2 蟺j)f.
f
CROSSOVER
is the frequency where the amplifier鈥檚 open-loop gain
equals 1 (0 dB).
DC gain is therefore
V
OUT
(
R
G
+
R
F
)
=
V
IN
R
G
The voltage error due to I
B
+ and I
B
鈭?is minimized if R
S
= R
F
||R
G
.
To include the effects of common-mode and power supply
rejection, model V
OS
as
V
OS
=
V
OS
nom
+
鈭?/div>
V
S
鈭?/div>
V
CM
+
PSR CMR
where:
V
os
nom
is the offset voltage at nominal conditions.
螖
V
S
is the change in the power supply voltage from nominal
conditions.
PSR
is the power supply rejection.
Closed-loop 鈭? dB bandwidth equals
V
OUT
R
G
=
f
CROSSOVER
脳
(
R
G
+
R
F
)
V
IN
C
MR
is the common-mode rejection.
螖
V
CM
is the change in common-mode voltage from nominal
conditions.
The closed-loop bandwidth is inversely proportional to the
noise gain of the op amp circuit, (R
F
+ R
G
)/R
G
. This simple
model can be used to predict the 鈭? 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.
Rev. A | Page 17 of 24

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