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how to use nfa
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on May 15, 2007
on May 16, 2007 by LouEckert
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i try to calibrate my nfa and the yellow line keeps jumping after cal done. is that normal?
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May 16, 2007 6:14 AM
Hello mmm -- What you see after calibrating the noise figure analyzer on the noise figure trace (the yellow line) can depend on the gain of the device under test. Higher gain presents larger noise power to the analyzer, and is a more stable reading. Lower gain presents less power, which is closer to the analyzer's noise floor. At lower noise power, the measurement will jump around more. If you need to test devices with low gain, then a system LNA is needed to reduce the system noise figure. The LNA should have around 20dB gain and its noise figure must be low, maybe 1 or 2 dB NF. If you can email me details of your DUT as well as your contact information, I can help you in more detail.
Inside RF and Microwave Applications Engineer
Agilent Technologies Contact Center
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