THE FORWARD CHARACTERISTIC OF THE PIN DIODE 



703 



2.6 



2.0 



K 1.5 



3 



LL 



1.0 



0.5 



0.1 



0.2 0.3 0.4 0.5 0.6 0.8 1.0 



4 5 6 8 10 



Fig. 6 — The function F„{y) of equation (81) for several values of co. 



which reduces to (3G) when co = 0. Thus the whole theory reduces cor- 

 rectly in the case w = 0. 



The function F„(t) is plotted in Fig. 6 for several values of w including 

 05 = 0. The expansion of F^{y) to order co" is 



FM = -^ - ifM 



7—1 4 



(t + 1) - 27 



/(t) = 



(n 7 



(86) 



(7 - 1)-^ 



1 



= 1 - 27 fn - + • • • 



7 



i 



Our next step is to eliminate from (80) and (85) unimportant depen- 

 i dencies on I which would be difficult or impossible to detect experi- 

 I mentally. If in (85) we let 7 = 1, cosh co = 1 we get 



^(Fo + F,„) = tn 



(87) 



In (80) we drop the first term (as if 7 = 1) and in the second term we 



