RHF310 Ver la hoja de datos (PDF) - STMicroelectronics

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RHF310

Rad-hard 400 µA high-speed operational amplifier

STMicroelectronics 

RHF310

6

Bias of an inverting amplifier

Bias of an inverting amplifier

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

Figure 26.

The value of this resistance is calculated from the negative and positive input bias current.

The aim is to compensate for the offset bias current, which can affect the input offset voltage

and the output DC component. Assuming Iib-, Iib+, Rin, Rfb and a 0 V output, the resistance

R is:

R = -R----i-n-----×----R-----f--b-

Rin + Rfb

Figure 26. Compensation of the input bias current

R

fb

Iib -

Rin

_

VCC+

+

Iib +

R

VCC -

Output

Load

AM00839

Doc ID 15577 Rev 3

17/22

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