Forums › General Discussions › Noise figure measurement
- This topic has 1 reply, 2 voices, and was last updated 5 months ago by Volker.
AKumarParticipantAKumar October 13, 2022 at 2:16 am
Kindly suggest me the best Noise source to be used with SM200B for the noise figure analysis.
VolkerParticipantVolker October 22, 2022 at 12:18 am
HP 346 B is a good but still expensive noise source.
Works well with SM200B. As most noise sources this one needs a 28V DC powersupply. You have to attach an external power supply.
the best ?
SM200B and a ( any ) noise source is a very good way to get an overview for noise figure measurements. Be carefull with cheap noise sources from the internet. Most of them have plenty of power and may damage your analyser.
I have also used one of the 20 EUR noise sources from the internet. All power stages have to be removed. Then it can be calibrated against a known noise source ( HP346B and Eaton 2075 noise gain analyser ). Works well up to 2GHz with comparable results to HP346B. Still frequency range of HP346B is far beyond the home brew one.
Keep in mind : noise figure measurements are not as trivial as it looks.
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