318 



BELL SYSTEM TECHNICAL JOURNAL 



SIGNAL 

 INPUT 



noCtnoV 

 neC+noV 



neCinoV 



SIGNAL 

 OUTPUT 



CARRIER SUPPLY 



(a) 



nnCtnoV SIGNAL 



neCtnoV output 



, V. - ^ , 



I I 



CARRIER SUPPLY 



DeCtneV 



noCtneV 

 I I 



CARRIER SUPPLY 



(C) 



SIGNAL 

 INPUT 



OoC+neV 

 neC±noV 



CARRIER SUPPLY 



noCtnoV 

 HeCineV 



SIGNAL 

 OUTPUT 



(d) 



SIGNAL 

 INPUT 



neC+noV 

 DeC+neV 



noCtnoV 

 noCtneV 



SIGNAL 

 OUTPUT 



(e) 



CARRIER SUPPLY 



Fig. 2 — Types of copper oxide modulator circuits. 



