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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits2 Marks
Question
A modulating signal is a square wave, as shown in Fig.

The carrier wave is given by $c(t) = 2\sin (8\pi t)$ volts.
  1. Sketch the amplitude modulated waveform,
  2. What is the modulation index?
✓

Answer

  1. The amplitude modulated waveform is given by superimposition of modulating signal on carrier wave and is shown below:
  1. We have,
$A_m = 1V, A_c = 2V$.
Therefore, modulation index is given by,
$\mu=\frac{\text{A}_{\text{m}}}{\text{V}_\text{C}}=\frac{1}{2}=0.5$

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