Question
A modulating signal is a square wave as shown in Fig.
The carrier wave is given by c(t) = 2 sin .
(i) Sketch the amplitude modulated waveform:
(ii) What is the modulation index?
Solution
(i) The amplitude modulated waveform is given by superimposition of modulating signal on carrier wave and is shown below : 
(ii) We have,
Am = 1 V , Ac = 2V .
Therefore, modulation index is given by,
