VOUT – INPUT + INPUT
參數(shù)資料
型號: EVAL-INAMP-62RZ
廠商: Analog Devices Inc
文件頁數(shù): 10/21頁
文件大小: 0K
描述: BOARD EVAL FOR AD620 SOIC
標準包裝: 1
每 IC 通道數(shù): 1 - 單
放大器類型: 儀表
板類型: 部分填充
已供物品: 板,IC 樣品
已用 IC / 零件: 8-DIP,8-SOIC 封裝
AD620
Rev. H | Page 17 of 20
GROUND RETURNS FOR INPUT BIAS CURRENTS
VOUT
– INPUT
+ INPUT
RG
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
+VS
–VS
AD620
00775-0-050
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 46, Figure 47, and Figure 48. 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
00775-
0-
049
Figure 47. Ground Returns for Bias Currents with Thermocouple Inputs
100k
Ω
VOUT
AD620
– INPUT
+ INPUT
RG
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
100k
Ω
–VS
+VS
00775-
0-
051
Figure 46. Ground Returns for Bias Currents with Transformer-Coupled Inputs
Figure 48. Ground Returns for Bias Currents with AC-Coupled Inputs
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