Hi Everybody;

I want to know more about LNA DESIGN METHODOLOGY. Does anyone know good methodology using CMOS technology ? Some people begin with Optimum width equation ( Thomas Lee Book) without understand how to choose Qsp factor !?  

Please, I need your help in order to fix some misundertanding.

Best regards

Yakeen

Hi,
Try to check the following tutorials:
http://www.zen118213.zen.co.uk/RFIC_Circuits_Files/MOS_CS_LNA.pdf-doesn't account explicitly for power consumption constrains,testbenches in ADS-
http://www.eel.upc.edu/rfcs/Material/LNA_design.pdf-two methods Shaeffer and Lee's power constrained and Inductor and power constrained,testbenches in CADENCE-
Also check:
"Noise optimization of an Inductively Degenerated CMOS Low Noise Amplifier",Pietro Andreani and Henrik Sjoland.
"A power constrained Simultaneous Noise and Input Matched Low Noise Amplifier Design Technique",Trung-Kien Nguyen,Yang-Moon Su and Sang-Gug Lee.
Or the chapter on LNA design of Thomas Lee Book "The Design of CMOS RFIC"
Or the root of all evil : " A 1.5 V, 1.5GHz CMOS Low Noise Amplifier",Derek K.Shaeffer,Thomas H.Lee
Hope it helps,

Hi yakeen,
Like we say in my country "N'hem a pams"-raw translated "step by step"-
1)QSP depends on γ,δ,α so it's technology dependant, if not specific info about noise parameters are available then the rules of thumb for long-channel,short-channel regime applies.
2)This "recipes" that I referenced in my opinion have a one big advantatge: they give you a starting point for design, LNA optimization can be hard or unnecesary depending on your target specs( for example if linearity is an issue and the LNA designed following the recipe doesn't fullfill it the party begins-maybe with a Volterra analysis or with multisine analysis-), also see that this design tutorials are intended for narrowband application not broadband design.
3) Future challenges? At this point-and the above points as well- I will be glad if other forum members enter in the discussion but I will take the risk of pointing a couple of issues.
a)Multistandard front-ends: as more and more communication protocols erupt it becomes clear(in my opinion) that it's necessary to integrate as much as possible in the same IC-GSM+WLAN+Bluetooth+Wibree?- and try to share blocks between protocols, you can see in another way with the so called Software Radio or Digital Radio were the aim is to move the ADC as close as possible to the antenna to realize all analog baseband functions in digital domain(in the last DCIS symposium professor Jose Silva-Martinez made a good tutorial about this) and there's a need of a versatile RF front-end.
b) With the increasings of operational frequencies due to CMOS scaling a song comes into my mind(When two worlds collide), I mean for years you can talk about two types of engineers:RFIC and Microwaves engineers(included those people that work with GaAs,InGaP or similar and made MMIC's), but now CMOS it's entering the mm-wave domain and I think that design techniques that were useless in RFIC(like s-parameters inside the IC) can start to become useful to take into account.

PS:about the lab thanks for your words, I want say nothing since I'm inside and I don't want to be seen either as egocentric or someone with false modesty I just will say that I consider myself below the average of lab members. For the possibility of PHD here I will say that you can try, but the difficult part-like always I suppose- will be to obtain funding with the additional problem that two professors are in a sabbatical this year-doing research outside the university-, I suggest you to contact with prof.Gonzalez,Aragones,Mateo or Altet(in no particular order) since they are the professors in the RF part and talk to them.