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TSH310ILT Arkusz danych(PDF) 15 Page - STMicroelectronics

Numer części TSH310ILT
Szczegółowy opis  400A High-Speed Operational Amplifier
PDF  19 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSH310ILT Arkusz danych(HTML) 15 Page - STMicroelectronics

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The Bias of an Inverting Amplifier
TSH310
15/19
7 The Bias of an Inverting Amplifier
A resistance is necessary to achieve a good input biasing, such as resistance R shown in Figure 30.
The magnitude of this resistance is calculated by assuming the negative and positive input bias current.
The aim is to compensate for the offset bias current, which could affect the input offset voltage and the
output DC component. Assuming Ib-, Ib+, Rin, Rfb and a zero volt output, the resistance R will be:
Figure 30: Compensation of the input bias current
R
R
in
R
fb
×
R
in
R
+
fb
-----------------------
=
R
Load
Output
Rfb
Rin
Ib-
Ib+
Vcc+
Vcc-
+
_
R
Load
Output
Rfb
Rin
Ib-
Ib+
Vcc+
Vcc-
+
_



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