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AN4586 bảng dữ liệu(PDF) 10 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Signal conditioning, differential to single-ended amplification
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AN4586 bảng dữ liệu(HTML) 10 Page - STMicroelectronics

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3-op amp instrumentation amplifier
AN4586
10/19
DocID026915 Rev 1
4
3-op amp instrumentation amplifier
The 3-op amp instrumentation amplifier configuration has been designed to improve the
CMRR impacted by the resistors, and thus to improve measurement accuracy when Vicm
varies.
Figure 6 shows the schematic of a 3-op amp instrumentation amplifier.
Figure 6. 3-op amp instrumentation amplifier schematic
The output voltage of the 3-op amp instrumentation amplifier is defined by Equation 10.
Equation 10
By considering R1 = Rx(1+εR1), R3 = Rx(1+εR3), R2 = Ry(1+εR2), R4 = Ry(1+εR4),
R5 = Rf(1+εR5), and R6 = Ry(1+εR6), the Gdiff, Gcm and Voffset parameters become as
shown in Equation 11, Equation 12, and Equation 13 respectively.
Equation 11
Equation 12
Vout3
Gdiff
Vdiff Gcm
Vicm Voffset
+
⋅
+
⋅
=
Gcm
Ry
Rx Ry
+
---------------------
εR1 εR4 εR2
–
εR3
–
+
()
=



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