TKAXS16TOKS AND JUNCTION DIODES 



831 



Fig. 3 is a plot of the static forward aiul ro verse eharactiMistics of the 

 four diodes shown in Fig. 2. Tlie eharacteristies were obtained using the 

 circuits in Figs. 1(b) and 1(e), respectively, measurements being made in 

 still air at room temperature. The curves in the first (luadrant, ( + /i' + /) 

 are the forward characteristics and the cur\'(>s in the third (juadrant 

 ( — E —I) are the re\'erse characteristics. Notice that the scales are 

 different in these (juadrants. In general, at any other temperature the 

 curves would shift their positions with ies{)ect to the reference axes. 

 This must be taken into account by the ciicuit designer. 



2.1.3. ,1 nnction Temperature 



We will limit further discussion of general characteristics to those of 

 Diode IV, for in many respects this is the most interesting rectifier for 



:aj 60 



i| 



< 40 



;^ 



:5 20 



iZ 







: in 



'ft 2.5 



ir Q. 



31 



in _j 

 Si 



?, ^ 7.5 



40 30 20 to 

 REVERSE VOLTS 



0.5 1.0 t.5 2.0 

 FORWARD VOLTS 



160 120 80 40 0.2 0.4 0.6 0.8 

 REVERSE VOLTS FORWARD VOLTS 



Z 3 



O CE 5 

 u. 3 < 



iu5 



; tr < 



)(r_i 



5Z 0.5 



Z OJ 



31 



10 



IT) _| 



Sz 



400 300 200 100 

 REVERSE VOLTS 



0.5 1.0 1.5 2.0 

 FORWARD VOLTS 



20 15 10 5 

 REVERSE VOLTS 



0.2 0.4 0.6 0.8 

 FORWARD VOLTS 



Fig. 3 — Junction rectifier static characteristics. 



