1238 thp: bell system techxical journal, November 1952 



rmU 



rb r, _''J^^ ho(rc-r, 



"T^AA 1 \W 



imlA 



Fig. 19 — Sj'nopsis of base n( 



and collector characteristics which are open-circuit stable. It would 

 have been more appropriate to solve the base circuit in terms of con- 

 ductances rather than resistances. The magnitudes of negati\-e resistance 

 obtained in this connection are quite low which may be misleading; the 

 negative conductance is quite high, however, which is desired in short- 

 circuit stable negative resistance circuits. 



Care should be taken in the literal employment of the approximate 

 regional relationships in Figs. 17, 18 and 19. They are very definitely 

 approximate and are intended to illustrate behavior and the limiting 

 condition only to bring out the relative importance of device param- 

 eters. It is suggested that calculations be started with the general 

 case and approximations be made as are valid. For example, the con- 



