a) i) Consider the AM signal s(t) = 10cos(3900tt) + 40cos(4000rt) + 10cos(4100Trt). Calculate the modulating frequency and the modulation index. %3D ii) A single sideband AM signal (SSB-SC) is given by s(t) = 10cos(11000 Trt). The carrier signal is c(t) = 4cos(1000OTt). Determine the modulating signal m(t). iii) The efficiency µ of an AM signal is defined as the percentage of the total power carried by the sidebands, that is PSDBS × 100% Ps u = where PSDBS is the power carried by the sidebands and P, is the total power of the AM signal. (a) Find u for when the AM modulation index is m 33.3%. 0.5. (b) Show that µmax is
a) i) Consider the AM signal s(t) = 10cos(3900tt) + 40cos(4000rt) + 10cos(4100Trt). Calculate the modulating frequency and the modulation index. %3D ii) A single sideband AM signal (SSB-SC) is given by s(t) = 10cos(11000 Trt). The carrier signal is c(t) = 4cos(1000OTt). Determine the modulating signal m(t). iii) The efficiency µ of an AM signal is defined as the percentage of the total power carried by the sidebands, that is PSDBS × 100% Ps u = where PSDBS is the power carried by the sidebands and P, is the total power of the AM signal. (a) Find u for when the AM modulation index is m 33.3%. 0.5. (b) Show that µmax is
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:a) i) Consider the AM signal s(t) = 10cos(3900tt) + 40cos(4000rt) + 10cos(4100Trt).
Calculate the modulating frequency and the modulation index.
%3D
ii) A single sideband AM signal (SSB-SC) is given by s(t) = 10cos(11000 Trt). The
carrier signal is c(t) = 4cos(1000OTt). Determine the modulating signal m(t).
iii) The efficiency µ of an AM signal is defined as the percentage of the total power
carried by the sidebands, that is
PSDBS
× 100%
Ps
u =
where PSDBS is the power carried by the sidebands and P, is the total power of the AM
signal. (a) Find u for when the AM modulation index is m
33.3%.
0.5. (b) Show that µmax is
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