TSH350

Inverting amplifier biasing

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Inverting amplifier biasing

A resistance is necessary to achieve good input biasing, such as resistance R shown in

Figure 34.

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

volt output, the resistance R is:

Figure 34.

Compensation of the input bias current

R

R

in

R

fb

×

R

in

R

+

fb

------------------------

=

R

Load

Output

I

ib-

I

ib+

V

CC-

+

_

R

Load

Output

I

ib-

I

ib+

V

CC-

+

_