c)An amplitude modulated (AM) signal, ¤ÂM(t), is represented by thefollowing expression:XAM (t) = [Ac + m(t)] cos(2π fct + π).The carrier frequency, fc = 107 Hz and the power in the modulation signal,m(t), is represented as Pm.(i)Derive an expression for the power efficiency, è, of the AM signal,XAM (t), in terms of Pm.(ii)=Given that the modulation index, u 0.5, determine the powerefficiency, n, of the modulating signal m(t) shown in Figure B1coverleaf. Am2TA3T/4-AmFigure B1c: Triangular waveform as modulating signal, m(t).T/4T/2

Answered: Image /qna-images/answer/f7eb0271-381f-4002-93b7-f0706d0534b9.jpg

Answered: m(t) T/2 T 2T

Engineering

Electrical Engineering

m(t) T/2 T 2T

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

c)
An amplitude modulated (AM) signal, ¤ÂM(t), is represented by the
following expression:
XAM (t) = [Ac + m(t)] cos(2π fct + π).
The carrier frequency, fc = 107 Hz and the power in the modulation signal,
m(t), is represented as Pm.
(i)
Derive an expression for the power efficiency, è, of the AM signal,
XAM (t), in terms of Pm.
(ii)
=
Given that the modulation index, u 0.5, determine the power
efficiency, n, of the modulating signal m(t) shown in Figure B1c
overleaf.

Am
2T
A
3T/4
-Am
Figure B1c: Triangular waveform as modulating signal, m(t).
T/4
T/2

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