DB problem of 2874

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DB problem of 2874

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Contributor I

微信图片_20191229130440.jpgBGA2874Adjust to the voltage of 2.5V, 18 mA is almost 10 DB worse.

The two tubes on the graph add up to noise, right?

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NXP TechSupport
NXP TechSupport

This noise calculation is not correct. The noise contribution of the second stage amplifier is divided by the second stage gain.

Please, see NF calculation formula in this document:
https://www.nxp.com/docs/en/white-paper/RFLNAWP.pdf

NFsys = 0.5dB + 3.5dB@G=30dB = 0.505dB

Have a great day,

Pavel
TIC

 

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