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RHF330 데이터시트(PDF) 18 Page - STMicroelectronics

부품명 RHF330
상세설명  Rad-hard 1 GHz low noise operational amplifier
PDF  22 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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RHF330 데이터시트(HTML) 18 Page - STMicroelectronics

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Bias of an inverting amplifier
RHF330
18/22
Doc ID 15576 Rev 3
7
Bias of an inverting amplifier
A resistance is necessary to achieve good input biasing, such as resistance R shown in
Figure 32.
The value of this resistance is calculated from the negative and positive input bias current.
The aim is to compensate for the offset bias current, which can affect the input offset voltage
and the output DC component. Assuming Iib-, Iib+, Rin, Rfb and a zero volt output, the
resistance R is:
Figure 32.
Compensation of the input bias current
R
R
in
R
fb
×
R
in
R
+
fb
------------------------
=
R
Load
Output
R
fb
R
in
I
ib
-
I
ib
+
V
CC+
V
CC
-
+
_
AM00839



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