TSH350_07 STMICROELECTRONICS [STMicroelectronics], TSH350_07 Datasheet - Page 17

• Manufacturer Part Number: TSH350_07
• Description: 550MHz low noise current feedback amplifier
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

TSH350
7
Inverting amplifier biasing
A resistance is necessary to achieve good input biasing, such as resistance R shown in
Figure
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 I
volt output, the resistance R is:
Figure 34. Compensation of the input bias current
34.
I
I
ib-
ib-
R
R
in
in
I
I
ib+
ib+
R
R
R
_
_
+
+
=
R
----------------------- -
R
in
in
+
R
R
V
V
V
V
R
R
fb
fb
CC+
CC+
CC-
CC-
fb
fb
Output
Output
ib-
Inverting amplifier biasing
Load
Load
, I
ib+
, R
in
, R
fb
and a zero
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