Analog-devices AD620 Manuel d'utilisateur télécharger pdf (Page 15)

AD620

REV. E

–15–

GROUND RETURNS FOR INPUT BIAS CURRENTS

Input bias currents are those currents necessary to bias the input

transistors of an amplifier. There must be a direct return path

for these currents; therefore, when amplifying “floating” input

OUT

AD620

– INPUT

TO POWER

SUPPLY

GROUND

REFERENCE

+ INPUT

–V

LOAD

Figure 42a. Ground Returns for Bias Currents with

Transformer Coupled Inputs

sources such as transformers, or ac-coupled sources, there must

be a dc path from each input to ground as shown in Figure 42.

Refer to the Instrumentation Amplifier Application Guide (free

from Analog Devices) for more information regarding in amp

applications.

OUT

– INPUT

+ INPUT

LOAD

TO POWER

SUPPLY

GROUND

REFERENCE

–V

AD620

Figure 42b. Ground Returns for Bias Currents with

Thermocouple Inputs

100kV

OUT

AD620

– INPUT

+ INPUT

LOAD

TO POWER

SUPPLY

GROUND

REFERENCE

100kV

–V

Figure 42c. Ground Returns for Bias Currents with AC Coupled Inputs

1 2 ... 10 11 12 13 14 15 16

Commentaires sur ces manuels

Pas de commentaire

Analog-devices AD620 Manuel d'utilisateur Page 15

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Analog-devices AD620