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AD620ANZ 데이터시트(Datasheet) 18 Page - Analog Devices

부품명 AD620ANZ
상세내용  Low Cost Low Power Instrumentation Amplifier
PDF  20 Pages
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제조사  AD [Analog Devices]
홈페이지  http://www.analog.com
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 18 page
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AD620
Rev. G | Page 18 of 20
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 sources, such as transformers or ac-coupled sources, there
must be a dc path from each input to ground, as shown in
Figure 47, Figure 48, and Figure 49. Refer to A Designer’s Guide
to Instrumentation Amplifiers (free from Analog Devices) for
more information regarding in-amp applications.
VOUT
AD620
– INPUT
RG
TO POWER
SUPPLY
GROUND
REFERENCE
+ INPUT
+VS
–VS
LOAD
Figure 47. Ground Returns for Bias Currents with Transformer-Coupled Inputs
VOUT
– INPUT
+ INPUT
RG
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
+VS
–VS
AD620
Figure 48. Ground Returns for Bias Currents with Thermocouple Inputs
100k
VOUT
AD620
– INPUT
+ INPUT
RG
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
100k
–VS
+VS
Figure 49. Ground Returns for Bias Currents with AC-Coupled Inputs




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