THE FEUTEX TOOLKIT

Three-Op-Amp Instrumentation Gain

Calculate the gain of the classic symmetric instrumentation topology.

Electronics workspace● Runs in your browser

01 Your input

Each first-stage feedback resistorohmGain bridge resistorohmOutput difference-stage resistor ratioratioDifferential inputV

02 Your result

View or copy raw result data

Result data

FormulaG=(1+2R/Rg)k

Sources and model references

Worked example

Inputs

Each first-stage feedback resistor: 10000 ohm
Gain bridge resistor: 2000 ohm
Output difference-stage resistor ratio: 2 ratio
Differential input: 0.01 V

Expected results

Differential gain: 22 V/V
Ideal output: 0.22 V

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

Enter the labeled inputs in the indicated units.
Calculate and compare every output against the stated model assumptions.

Try this example

{
  "r": 10000,
  "rg": 2000,
  "ratio": 2,
  "diff": 0.01
}

Accuracy and scope

Symmetric first stage and exactly matched output-stage resistor ratios; no common-mode or output range check. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.