Instrumentation Amplifier Calculator
Calculate the output voltage of an instrumentation amplifier based on input voltages and resistor values
Amplifier Configuration
By default, we assume R₁ = R₂ = R₃ = 10kΩ for simplified calculation
Circuit Diagram
Formula
The three op-amp instrumentation amplifier provides high input impedance, excellent common-mode rejection, and precise differential gain. The first stage (two op-amps) provides high input impedance and initial gain controlled by Rgain, while the second stage (differential amplifier) provides additional gain and common-mode rejection.
About Instrumentation Amplifiers
Instrumentation amplifiers are precision differential amplifiers with high input impedance, low output impedance, high common-mode rejection ratio (CMRR), and precise gain that can be set with a single resistor.
Key features:
- High input impedance (typically >10⁹Ω)
- Low output impedance
- High common-mode rejection ratio (80-120dB)
- Low DC offset
- Low drift
- Low noise
Common applications:
- Medical equipment (ECG, EEG)
- Precision data acquisition
- Bridge amplifiers (strain gauges, RTDs)
- Industrial process control
- Test and measurement equipment