L T I 



'f fc _?^ Ico(rc-rc"') 



_t t. 



GENERALIZED COLLECTOR CIRCUIT 



I V\A- 





±.. 



SIMPLIFIED COLLECTOR CIRCUIT 



Synopsis 



General 



Vcc + I,o{re — Tc'") = Ic 



Te + Re + n + Ri - 



in + RbKn + Rb + rj ' 

 r, + R, + rh+ Rb 



V,.in + R,> + rJ 

 r, + R, + n +Ri, 

 Approximate Short Circuit Case 

 where 



R, = Rc = 0; n^Rb] Icoiu - n'") < F„ , i?6 <C r„ , r^ 



Region I 



Rb 



Region II 

 Region III 



V, = Lire + Rb) + V, -" 



Whm + Rb) 



Fe -Zjr.d - a)] + 



Rb 



Vc = IciK" + rr - r'^) + T^ 



'Tc + Rb" 



Y, 



I =1' 

 ^'^ Rb 



Vc. = V, 



Rb 



Rb\a - 1/ 



Vcp ^ rc+ Rb 



T cv Rb 



1 + 



air'/' + r'c" - r'^')' 



Rbia - 1) J 



Fig. 18 — Synopsis of collector negative resistance characteristic and properties. 



1236 



