Hi,

you can start reviewing the article in this link https://www.researchgate.net/publication/257200458_2004IEICETF_Symbolic_computation_of_NF_of_transistor_circuits

more recent works on computing the gain and noise of CMOS amplifiers are listed in the publications of both authors in researchgate,

Data 2004IEICETF Symbolic computation of NF of transistor circuits

Dear Sir,

                            Thank you for your help. I went through all the articles as you showed.  Which article is more  helpful to finding our circuit gain and  noise figure. I think all are different, all are not closer to our requirement gain and noise figure. can you advice me, which one is more helpful and closer to our question.

              I want to get the Gain and NF of the below circuit. The input is given at the Gate of the both the  transistors. How to get the NF and Gain, when input is given at the Both the gate of the transistors of T1 and T2.

Hi, it is possible in terms of the ABCD parameters of the transistors so that it allows to find the total ABCD paramaterers of the cascaded transistors just by multiplication.

Both the gain and the noise figure are involved with the ABCD parameters.

Also, you can benefit from the following sources:

[1] Dobrowolski-Janusz A. Introduction to Computer Methods for Microwave Circuit Analysis and Design. London, UK: Artech House; 1991

[2] Gonzalez, Microwave Transistor Amplifiers

[3] Pozar, D. M., Microwave Engineering

I wish it will be useful for you,

Good luck.

is this the best topology for low noise amplifier, or only the noise calculus is important?

For noise calculus did you try to use the transistor noise figure from DS? It looks to me that you designed the LNA based on DS recommendation. To compute the gain, I would use a transistor model, depending on what frequency range you are using it. Then I would follow the general rules to find the transfer function as Vout/Vin. For noise, as I said above, I would try to use the noise factor  given in the DS., and of course the definition of Noise Factor. Then  I would apply the general NF calculus method  to this particular topology. There have been almost 40 years since I have learned about this calculus at "Politehnica" University in Bucharest, and if I push a bit my memory, I could reconstitute it. But is there not  enough modelling software to solve the problem faster?

Good luck.