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LNA mixed-signal mode Noise Figure de-embeding

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fred3991

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Hi everyone,

I was wondering if it is possible to get NF from Single-ended to differential LNA measurements using Friis formula?

The complete measurement setup looks like this
1694009128565.png

I need to determine the NF for the LNA.


I have checked this solution using matlab.
(lets Assume that the NF for this LNA is 4 dB***)
1694009163047.png

Result in matlab
1694009379023.png



Is this approach acceptable and correct, or should other deembedding techniques be used to determine NF for LNA?


Thanks in advance for any information and ideas provided.
 
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It's principally correct. Either single ended or differential, the Friis Equation is always identical.
I didn't check Matlab script, no idea.
 
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BigBoss said:
It's principally correct. Either single ended or differential, the Friis Equation is always identical.
I didn't check Matlab script, no idea.
Click to expand...
In matlab I just symbolically solved the NF of stage 2 (LNA) from Friis, and then solved this equation and got again the value of NF =4 dB
 
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