general

Instrumentation Amplifier

Computes the output voltage of a standard three op-amp instrumentation amplifier: Vo = (V2 - V1) × (1 + 2R1/Rg) × (R3/R2), where R1 sets the gain alongside Rg, and R2/R3 form the differential output stage.

Inputs

Voltage V1(V)

Input voltage V1 in volts

Voltage V2(V)

Input voltage V2 in volts

Resistor R1(Ω)

R1 resistor value in ohms — paired with Rg to set gain

Resistor R2(Ω)

R2 resistor value in ohms — output stage resistor

Resistor R3(Ω)

R3 resistor value in ohms — output stage resistor

Resistor Gain Rg(Ω)

Gain resistor Rg in ohms — controls overall amplifier gain

Results

⚠R2 must be greater than zero

Output Voltage—VInstrumentation amplifier output voltage in volts