THE FEUTEX TOOLKIT

Spurious-Free Dynamic Range

Compare a measured largest spur with both carrier and full-scale power.

Communications workspace● Runs in your browser

01 Your input

Carrier powerdBmLargest spurdBmFull-scale carrier powerdBm

02 Your result

View or copy raw result data

Result data

FormulaSFDRdBc=Pcarrier−Pspur; SFDRdBFS=Pfullscale−Pspur

Sources and model references

https://www.analog.com/media/en/training-seminars/tutorials/MT-003.pdf

Worked example

Inputs

Carrier power: -5 dBm
Largest spur: -75 dBm
Full-scale carrier power: 0 dBm

Expected results

Carrier-referenced SFDR: 70 dBc
Full-scale-referenced SFDR: 75 dBFS
Carrier backoff: 5 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

{
  "carrier": -5,
  "spur": -75,
  "full": 0
}

Accuracy and scope

Measured powers must use the same resolution bandwidth and calibration; largest spur identification is external. 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.