question_answer 14)

  I-V characteristics of four devices are shown in Fig. 10(EP).1   Identify devices that can be used for modulation: (a)  ?i?  and ?iii?                    (b) only ?iii? (c) ?ii? and some regions of ?iv? (d) All the devices can be used

Answer:

  (c) Here, (i) represents Ideal modulation related  to triode valve for linear plate modulation. (ii) represents square law diode modulation, (iii) represents constant current source (iv) represents part of it as square law modulation. Thus, for modulation (»') and some regions of (iv) can be used.