1312 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1953 



in the region between emitter and collector in Fig. 2(b). It flows radially 

 outward to the base contact. 



^ " ^ 8^ (PbM) + 2:jj. (PbM In (r2/ri) + — (pb/wt) In (n/r2) 



LSirif;! 2wW2 n \^2/ J 



B. rb2 — Inspection of Fig. 7 shows that the collector capacitance 

 current originating opposite the emitter junction (Ii) has the same flow 

 path as the (l-a)ie current. The remainder of the collector current which 

 enters the base from the collector outside the emitter (I2) likewise flows 

 radially out to the base contact. The total feedback voltage developed 

 between emitter junction and base contact is 



Ini'-i 



r2) J 4:TrW', 



r2/ri = 2 

 n/r2 = 2 



