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參數(shù)資料
| 型號(hào)： | AD8067 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Gain Bandwidth Product Precision Fast FET⑩ Op Amp |
| 中文描述： | 高增益帶寬積精密高速運(yùn)算放大器場(chǎng)效應(yīng)⑩ |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 873K |
| 代理商： | AD8067 |
AD8067
DC ERROR CALCULATIONS
Rev. 0 | Page 17 of 24
Input and Output Overload Behavior
Figure 44 illustrates the primary dc errors associated with a voltage
feedback amplifier. For both inverting and noninverting
configurations:
A simplified schematic of the AD8067 input stage is shown in
Figure 45. This shows the cascoded N-channel JFET input pair,
the ESD and other protection diodes, and the auxiliary NPN
input stage that eliminates phase inversion behavior.
+
=
G
F
G
OS
OS
R
R
R
V
V
to
due
Error
Voltage
Output
When the common-mode input voltage to the amplifier is driven
to within approximately 3 V of the positive power supply, the input
JFET’s bias current will turn off, and the bias of the NPN pair will
turn on, taking over control of the amplifier. The NPN differential
pair now sets the amplifier’s offset, and the input bias current is
now in the range of several tens of microamps. This behavior is
illustrated in Figure 25 and Figure 26. Normal operation resumes
when the common-mode voltage goes below the 3 V from the
positive supply threshold.
F
–
B
G
G
F
S
B
B
R
I
–
R
R
R
R
I
=
I
to
due
Error
Voltage
Output
×
+
×
+
Total error is the sum of the two.
DC common-mode and power supply effects can be added by
modeling the total V
OS
with the expression:
CMR
V
PSR
V
(nom)
V
(tot)
V
CM
S
OS
OS
+
+
=
The output transistors have circuitry included to limit the extent
of their saturation when the output is overdriven. This improves
output recovery time. A plot of the output recovery time for the
AD8067 used as a G = +10 buffer is shown in Figure 17.
V
OS
(nom)
is the offset voltage specified at nominal conditions
(1 mV max).
V
S
is the change in power supply voltage from
nominal conditions.
PSR
is power supply rejection (90 dB
minimum).
V
CM
is the change in common-mode voltage from
nominal test conditions.
CMR
is common-mode rejection (85 dB
minimum for the AD8067).
V
BIAS
V
CC
V
EE
V
EE
V
CC
V
P
V
N
SWITCH
CONTROL
V
EE
V
CC
TO REST OF AMP
V
THRESHOLD
V
I
R
S
R
G
I
B
+
I
B
–
–
+
V
OUT
–
+
–
+
+V
OS
–
R
F
Figure 44. Op Amp DC Error Sources
Figure 45. Simplified Input Schematic
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