Differential Amplifier Calculator

⊕ Differential Amplifier Calculator

Calculate gain and output voltage for an op-amp differential amplifier.

$$V_\text{out} = -V_1\!\left(\dfrac{R_2}{R_1}\right) + V_2\!\left(1+\dfrac{R_2}{R_1}\right)\!\dfrac{R_4}{R_3+R_4}$$

V1 (Inverting Input)

V2 (Non-Inverting Input)

Output Voltage

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Differential Gain (R2/R1)

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Common-Mode Gain

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Resistor Match

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$$\text{Gain} = \dfrac{R_2}{R_1} \qquad R_2 = \text{Gain} \times R_1 \qquad R_3 = R_1 \qquad R_4 = R_2$$

Desired Gain (Vdiff)

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R3 (= R1)

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R4 (= R2)

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Achieved Gain

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For matched CMRR, use 0.1% tolerance resistors.