70 NETWORK REALIZATION OF OPTIMUM PERFORMANCE [Ch. 7 



Input (1) o- 



:i?n=i ' 



rM-V4WW 



(2)'? 



-o (3) Output 



i?i 



Fig. 7.3. Realization of optimum amplifier noise performance from canonical form of the 



amplifier. 



amplifier is unilateral and is described by the equations : 





&3 + 5/ 



where 



WV = kTo A/ 



h 



'2 _ 



^nl 



(1 - RiY 



'1 02 



The available gain G of the amplifier with a 1-ohm source is 



= -(ItI)' 



The excess-noise figure of the resulting amplifier is 



F - 1 



5/ 



kToAf 



(7.39) 

 (7.40) 



(7.41a) 

 (7.41&) 

 (7.41c) 



(7.42) 

 (7.43) 



