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

  1. Feb 19, 2014 #1
    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
     

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  2. jcsd
  3. Feb 19, 2014 #2

    berkeman

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    Staff: Mentor

    What are your thoughts on the question? Is this for school?
     
  4. Feb 19, 2014 #3
    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.
     
    Last edited: Feb 19, 2014
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