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

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***)

Result in matlab



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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