LNA
Say i want an NF of 1.5dB, in what way i can try to achieve this in LNA design?
Thanks.
what kind of technology are we talking about?CMOS or bipolar or what?
I am not sure but I think if you burn a lot of power CS degenerated LNA is capable for 1.5dB NF
it is tsmc18rf.
iam constrained by power limitation of 6mA.
the quality factor of Lg doesn't seem to be affecting the NF(from simulatons).
While ago LNA with very low noise figure can get only in GaAs (FET or HEMT):
http://www.mitsubishichips.com/Globa.../hf/sm_02.html
But now they are available in other processes including SiGe:
http://www.infineon.com/cms/en/produ...12ab6b2c590752
the quality factor of Lg should influence the noise factor F,right
F=1+Rg/Rs+gama*gdo*Rs(f0/ft)^2
Rg,Rs is the parasitic resistance of the gate and source inductor
gdo is the transconductance when Vds=0,f0 is the working frequency while ft is the cut off frequency
gama is the noise coefficient ,about 1 for 0.18um
then you can calculate
How can you measure gd0?