PROPERTIES AND APPLICATIONS OF U-p-U TRANSISTORS 



539 



2^ 



20 



1 16 



I 

 O 



o 

 ^'2 



^^ 



-0.2 -0.4 -0.6 -0.8 -I.O -1.2 -1.4 -1.6 -1.8 -2.0 

 le IN MILLIAMPERES 



Fig. 8— Variation of r^ with emitter current at fixed collector voltage. 



280 



240 



200 



160 



120 



80 



40 



■0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1,4 

 le IN MILLIAMPERES 



■1.8 -2.0 



Fig. 9 — Variation of base resistance with emitter current. Scatter of the data indicates 

 that the measurements were not accurate. 



is about 80° F., this reduces to 



fe = 



25.9 



le 



(2) 



where /« is measured in milliamperes. Within experiment error, values of 

 Ye computed from this relation agree perfectly with the measured curve 

 shown in Fig. 10. 



