K305(2004) 데이터 시트보기 (PDF) - STMicroelectronics

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K305
(Rev.:2004)

550 MHz, Low Noise Current Feedback Amplifier

STMicroelectronics 

TSH350

The Bias of an Inverting Amplifier

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:

R = -R----i--n----×----R-----f--b

Rin + Rfb

Figure 34: Compensation of the input bias current

Ib-

Rin

Rfb

_

Vcc+

+

Ib+

R

Vcc-

Output

Load

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