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AD8021 데이터시트(PDF) 18 Page - Analog Devices

부품명 AD8021
상세설명  Low Power, 1 nV/?숰z, G ??10 Stable, Rail-to-Rail Output Amplifier
PDF  24 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD8021 데이터시트(HTML) 18 Page - Analog Devices

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ADA4895-2
Data Sheet
Rev. 0 | Page 18 of 24
DC ERRORS
Figure 39 shows a typical connection diagram and the major
dc error sources.
RG
– VIN +
RS
– VIP +
IB+
IB–
+ VOUT –
RF
+ VOS –
Figure 39. Typical Connection Diagram and DC Error Sources
The ideal transfer function (all error sources set to 0 and
infinite dc gain) can be expressed as follows:
IN
G
F
IP
G
F
OUT
V
R
R
V
R
R
V
×


−
×


+
= 1
(1)
This equation reduces to the familiar forms for noninverting
and inverting op amp gain expressions, as follows:
For noninverting gain (VIN = 0 V),
IP
G
F
OUT
V
R
R
V
×


+
= 1
(2)
For inverting gain (VIP = 0 V),
IN
G
F
OUT
V
R
R
V
×


 −
=
(3)
The total output voltage error is the sum of the errors due to the
amplifier offset voltage and input currents. The output error due
to the offset voltage can be estimated as follows:
ERROR
OUT
V
=
(4)


+
×
+
−
+
+
G
F
OUT
PNOM
P
CM
OFFSET
R
R
A
V
PSRR
V
V
CMRR
V
V
NOM
1
where:
NOM
OFFSET
V
is the offset voltage at the specified supply voltage,
which is measured with the input and output at midsupply.
VCM is the common-mode voltage.
CMRR is the common-mode rejection ratio.
VP is the power supply voltage.
VPNOM is the specified power supply voltage.
PSRR is the power supply rejection ratio.
A is the dc open-loop gain.
The output error due to the input currents can be estimated
as follows:
+
−
×


+
×
−
×


+
×
=
B
G
F
S
B
G
F
G
F
OUT
I
R
R
R
I
R
R
R
R
V
ERROR
1
1
)
||
(
(5)
BIAS CURRENT CANCELLATION
To cancel the output voltage error due to unmatched bias currents
at the inputs, Resistors RBP and RBN can be used (see Figure 40).
RG
RS
RBP
RBN
RF
Figure 40. Using RBP and RBN to Cancel Bias Current Error
To compensate for the unmatched bias currents at the two
inputs, set Resistors RBP and RBN as shown in Table 8.
Table 8. Setting RBP and RBN to Cancel Bias Current Error
Value of R
F||RG
Value of R
BP (Ω)
Value of R
BN (Ω)
Greater Than R
S
R
F||RG − RS
0
Less Than R
S
0
R
S − RF||RG



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