Does NFmin in cascode LNA depend on the negative feedback inductance?

anhnha · Feb 19, 2014

Hi,
This is a cascode LNA. Please help me with the question in picture. Thank you.

attachment.php?attachmentid=66772&stc=1&d=1392802595.jpg

berkeman · Feb 19, 2014

What are your thoughts on the question? Is this for school?

anhnha · Feb 19, 2014

No, I am designing a LNA not a homework.

I read some books and papers saying that NFmin in two cases are equal. However, I would like to understand clearly why and read a decent proof.
Do you have ideal how to prove that?
Thanks.

Does NFmin in cascode LNA depend on the negative feedback inductance?

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Does NFmin in cascode LNA depend on the negative feedback inductance?

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