I am going through some design equation of LNA NF calculation and found that for Common-Gate CMOS LNA, if the input resistance is matched with 1/gm, then the NF=1+gamma, independent of the load R (i.e. Gain of the amplifier), this is sort of contradict of my intuition, Is it really the case?
Pls refer to Thomes Lee Book Chapter 12 on LNA, think he gave a pretty detail insights. Anyway i got it worked out, email me if you require the exact steps.