design of CMOS low noise amplifier

[macg84]

cox cmos lna

Hello,
I have designe a low noise amplifier, but I don't know if my procedure is correct, is there someone that can help me? in attached there is the circuit.
Thank you

 

[fanshuo]

what is your procedure? what is your problem

 

[macg84]

I can guess that my procedure is correct, but how can I test this LNA with cadence to verify if it is correct or not correct? The two PORT in the schematic how do i have to use? you can help me?

 

[DDavid]

Add S2p analysis
define Port 1 is Input
Port 2 as output

simulate check S21, NF, S11 etc...

David

 

[psmon]

If you designed in Cadence, read Spectre documentation.

 

[byteptr]

Hi,

what does mean "procedure"?

You mean circuit topology? simulate procedure in cadence? or circuit calculations?

 

[macg84]

To design the differntia LNA :
1) The firs step is to define the optimal width of the input trasconductor

Wopt=1/(3*ω*L*Cox*Rs)>>>>where ω=2*π*f
L=length of Mosfet commonly is the minimum length
Cox=oxid capacitance
Rs=input resistence

2)We have to copute the parastic capacotance of input mosfet (M1,M2)

Cgs=(2/3)*W*L*Cox+W*Cgd0

Cgd0 and Cox are dependent on tecnology

3) We can compute ωt=(gm/Cgs)
4)Ls=(Rs/ωt)
5)Zin=s*(Ls+Lg)+(1/s*Cgs)+ωt*Ls

In attached there is the schematic
If there is some problems you can ask me ; )

 

[syed01]

Re: cox cmos lna

Hello,
I have designe a low noise amplifier, but I don't know if my procedure is correct, is there someone that can help me? in attached there is the circuit.
Thank you

Dear,
Can u plz tell me about ur LNA efficiency,it is working or not.and how much freq. we can give to its input.i hv to design LNA for operating 800Mhz.plz tell me