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TSH330 Datasheet(PDF) 16 Page - STMicroelectronics

Part # TSH330
Description  1.1 GHz Low-Noise Operational Amplifier
PDF  19 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSH330 Datasheet(HTML) 16 Page - STMicroelectronics

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TSH330
The Bias of an Inverting Amplifier
16/19
7 The Bias of an Inverting Amplifier
A resistance is necessary to achieve a good input biasing, such as resistance R shown in
Figure 35.
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 35. 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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