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

Bihar 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) = 2sin (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,

Am = 1V, Ac = 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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