Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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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.
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Transcribed Image Text: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
expand button
Transcribed Image Text:Am 2T A 3T/4 -Am Figure B1c: Triangular waveform as modulating signal, m(t). T/4 T/2
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