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TSH350ID Datasheet(PDF) 16 Page - STMicroelectronics

Part # TSH350ID
Description  550 MHz, Low Noise Current Feedback Amplifier
PDF  21 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSH350ID Datasheet(HTML) 16 Page - STMicroelectronics

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TSH350
The Bias of an Inverting Amplifier
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7 The Bias of an Inverting Amplifier
A resistance is necessary to achieve a good input biasing, such as resistance R shown in Figure 33.
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 34: 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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