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RHF310 データシート(PDF) 17 Page - STMicroelectronics

部品番号 RHF310
部品情報  Rad-hard 400 μA high-speed operational amplifier
PDF  22 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RHF310 データシート(HTML) 17 Page - STMicroelectronics

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RHF310
Bias of an inverting amplifier
Doc ID 15577 Rev 3
17/22
6
Bias of an inverting amplifier
A resistance is necessary to achieve good input biasing, such as resistance R shown in
Figure 26.
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 0 V output, the resistance
R is:
Figure 26.
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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