Y-Factor Noise Figure Calculator
Inputs Y-Factor
Calibration — noise source only
Noise Source OFF Nsrc,off
OFF
dBm
Noise Source ON Nsrc,on
ON
dBm
Measurement — noise source + DUT
Noise Source OFF Ndut,off
OFF
dBm
Noise Source ON Ndut,on
ON
dBm
Noise Source Parameters
Excess Noise Ratio ENRdB
dB · from noise source
Result
— dB DUT Noise Figure
Reference & Examples
Application Note
1MA178 · The Y-Factor Technique for Noise Figure Measurements
↗ Open PDF
Example Measurements
Calibration — Noise Source Only No DUT in path
Spectrum analyzer screenshot
Marker 1 Noise Source OFF — average noise power with source in cold state (Nsrc,off)
Marker 2 Noise Source ON — average noise power with source biased (Nsrc,on)
10 s sweep time captures both ON and OFF states of the noise source in a single trace
Measurement — Noise Source + DUT DUT in path
Spectrum analyzer screenshot
Marker 1 Noise Source OFF + DUT — noise floor through DUT, source cold (Ndut,off)
Marker 2 Noise Source ON + DUT — amplified noise through DUT, source biased (Ndut,on)
10 s sweep time captures both ON and OFF states of the noise source in a single trace
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