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

Thread starter anhnha
Start date Feb 19, 2014
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Feedback Inductance Negative

AI Thread Summary

The discussion centers on the relationship between NFmin in a cascode low-noise amplifier (LNA) and the negative feedback inductance. The original poster seeks clarification on whether NFmin remains constant across different configurations, referencing literature that suggests equality in two cases. They express a desire for a clear proof of this concept rather than assistance with academic work. Participants are encouraged to provide insights or references that could help in understanding this relationship more thoroughly. The conversation emphasizes the need for a deeper exploration of NFmin and its dependence on circuit parameters.

Feb 19, 2014

anhnha

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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Feb 19, 2014

berkeman

Admin

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

Feb 19, 2014

anhnha

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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