parameter of lna
For LNA's the most important parameters are (Of Course) Low Noise
Figure, and Gain. If you have Low Noise and High Gain this will keep
the whole systems noise close to the LNA's. For Example:
NFt= NF1 + (NF2-1)/G1 + (NF3-1)/(G1*G2) +.....
Now note if G1 is large, NF1 is low and NF2 will not greatly affect the
Systems noise( If you only use 2 Amps, use first 2 terms).
NFt = 2 + (5-1)/12 + (20-1) /(12*3) = 2.86
Remember the noise and gain for this EQ are in linear form, and you must
convert the answer to dB.
Also your systems application will determine what parameters are more important, so there is no perfect answer to this question.
Hope this helps.