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THE FEUTEX TOOLKIT

Op-Amp White Noise Budget

Combine source thermal, voltage-noise and current-noise contributions.

Signal Processing workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
Formulae²=4kTR+en²+(inR)²; Vrms=e√BW
Sources and model references

Worked example

Inputs

Source resistance
1000 ohm
Temperature
300 K
Voltage density
5e-09 V/√Hz
Current density
1e-12 A/√Hz
Noise bandwidth
10000 Hz

Expected results

Input noise density
6.524399436e-09 V/√Hz
Integrated input noise
6.524399436e-07 V

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

How to use this tool

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

Try this example

{
  "r": 1000,
  "t": 300,
  "en": 5e-9,
  "in": 1e-12,
  "bw": 10000
}

Accuracy and scope

Independent white sources and supplied equivalent noise bandwidth; excludes 1/f noise. 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.