AN4586 datasheet(7/19 Pages) STMICROELECTRONICS

tên linh kiện	AN4586

Giải thích chi tiết về linh kiện	Signal conditioning, differential to single-ended amplification

PDF	19 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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7 / 19 page

DocID026915 Rev 1

7/19

AN4586

2-op amp instrumentation amplifier

The 2-op amp instrumentation amplifier configuration is composed of one additional op-amp

compared to the differential configuration. Because of this, the signal “sees” a high

impedance and consequently is not impacted.

Figure 4 shows the 2-op amp instrumentation amplifier schematic.

Figure 4. 2-op amp instrumentation amplifier schematic

If we do not consider the inaccuracies, we have Equation 6 at the output.

Equation 6

Considering Rf1 = Rg2 = Rβ, Rg1 = Rf2 = Rα, and the input offset voltage of the op

amp, we get Equation 7:

Equation 7

So, we get Equation 8:

Vout2

V2 1

Rf2

Rg2

-----------

⎝⎠

⎛⎞ V1 Rf2

Rg2

-----------

Rf1

Rg1

-----------

⎝⎠

⎛⎞

–

Vout2

V2 V1

–

() 1

-------

⎝⎠

⎛⎞

Vio2 Vio1

–

() 1

-------

⎝⎠

⎛⎞

–

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