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Design >> RF Design >> Fmin in cascode LNA.
https://designers-guide.org/forum/YaBB.pl?num=1387092751

Message started by baab on Dec 14^th, 2013, 11:32pm

Title: Fmin in cascode LNA.
Post by baab on Dec 14^th, 2013, 11:32pm

Hi,
I am trying to find the formula Fmin for cascode LNA. My proof is based on the book "The Design of CMOS Radio-Frequency Integrated Circuits" by Thomas H. Lee . My result is wrong as it depends on Ls while in some papers they said that Fmin is affected by Ls. Could you help me check my work? I can't figure out where I am wrong. Thanks.

Title: Re: Fmin in cascode LNA.
Post by baab on Dec 14^th, 2013, 11:34pm

Here is the second picture:

Title: Re: Fmin in cascode LNA.
Post by baab on Dec 14^th, 2013, 11:35pm

And this is the last one:

Title: Re: Fmin in cascode LNA.
Post by baab on Dec 15^th, 2013, 8:56pm

Could you help me check the input-refered voltage and current? That is where I am not sure.

Title: Re: Fmin in cascode LNA.
Post by baab on Dec 19^th, 2013, 7:56pm

Well, I know it is not easy to follow but could you please tell me about the part input-refered noise (current and voltage noise sources)?