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ENR-Noise-Source-Calibration.php    5361 Bytes    12-06-2024 17:47:09


Online Calibration of Noise Sources : The ENR value


Manual and online Calculation





Your homebrew Noise Source is only as good as the provided ENR value. Here we show how to achieve that. The drawback : you need a good Spectrum Analyzer. We used the FSP-3 from Rohde & Schwarz. This is our calibrated Reference.

Set the attenuator of the Spectrum Analyzer in manual mode to 0 dB. Connect your Noise Source and power it up. As this is a noisy thing, some averageing mayst be necessary. Set a marker on the frequency of interest and note the power. With the calculator below, you can then calculate the ENR value.



Frequency [MHz]
RBW [MHz]
Noise Level ON [dBm]


ENR [dB]




✈ Method used




Starting with the (averaged) Power in dBm, we go to dBm/Hz by compensating for the RBW (resolution bandwidth). Adding the thermal noise of a resistor @ 300 K, we get the ENR value of the Noise Source.

If the amplitude response of your Noise Source is not that horizontal, several values mayst be a good idea to fully describe it.




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t1 = 6577 d

t2 = 181 ms

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