THE FEUTEX TOOLKIT

Two-Stage Noise Figure

Quantify cascade noise using first-stage gain and both noise figures.

Communications workspace● Runs in your browser

01 Your input

First-stage noise figuredBFirst-stage gaindBSecond-stage noise figuredB

02 Your result

View or copy raw result data

Result data

FormulaFtotal=F1+(F2−1)/G1

Sources and model references

https://www.analog.com/media/en/training-seminars/tutorials/MT-006.pdf

Worked example

Inputs

First-stage noise figure: 3 dB
First-stage gain: 10 dB
Second-stage noise figure: 10 dB

Expected results

Cascade noise factor: 2.895262315 ratio
Cascade noise figure: 4.616879176 dB

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

{
  "nf1": 3,
  "g1": 10,
  "nf2": 10
}

Accuracy and scope

Matched cascaded stages using available power gain; reference temperature consistent across inputs. 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.