814 THE BELL SYSTEM TECHNICAL JOUENAL, JULY 1956 



from different parameter values and variation. The analysis presented 

 in this paper regarding amplifier design was motivated by the study of 

 t(>trodes, but the results are ecjuall}^ applicable for other types. 



The design of an amplifier begins with a characterization of the 

 transistor which is suital)le for the study of its performance as an am- 

 plifier. From this characterization, or functional representation, one 



CORRESPONDING QUANTITIES 



RELATIONSHIPS BELOW ARE BETWEEN QUANtrjl 

 IN COLUMN I. CORRESPONDING RELATIONSHIPS] 

 WRITTEN DIRECTLY FOR CORRESPONDING QUA^^ 

 IN ANY OTHER COLUMN. 



(1) E,= I,h„ + E2h,2 



(2) l2= I,h2,+E2h22 



h,2h2, 



(3) Zl= h„ - 



(4) Yo 



(5) 1,= 



Yl + 1^22 

 h,2h2i 



^zz 



Zs + h„ 

 h2,EsYL 



(h„ + Zs)(h22 + YL)-h,2h2, 



Fig. 1 — Two-port parameters with summary of relationships. 



