2) You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos wet, where m(t) is a signal band-limited to B Hz. Figure below shows a DSB-SC modulator available in the stock room. The carrier generator available generates not cos wet, but cos w.t. M(f) km(t)cos³ wet т(t) A Filter -B В cos³ wet a) b) Sketch the signal spectra at points a and b. Is it possible to realize a DSB-SC modulator as in the figure above? (If yes) what kind of filter should be used? Comment on the bandwidth of the filter and the minimum and/or maximum frequencies that the filter should allow to pass. c) What is the minimum usable value of w,?

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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a=1

b=8

c=0

d=9

e=0

f=0

g=0

h=3

i=3

2) You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos wet, where
m(t) is a signal band-limited to B Hz. Figure below shows a DSB-SC modulator available in the stock
room. The carrier generator available generates not cos wet, but cos³ wct.
M(f)
km(t)cos³ w.t
m(t)
A
Filter
а
(b
f
-B
В
cos³ wct
a)
b)
Sketch the signal spectra at points a and b.
Is it possible to realize a DSB-SC modulator as in the figure above? (If yes) what kind of filter
should be used? Comment on the bandwidth of the filter and the minimum and/or maximum frequencies
that the filter should allow to pass.
c)
What is the minimum usable value of w.?
Transcribed Image Text:2) You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos wet, where m(t) is a signal band-limited to B Hz. Figure below shows a DSB-SC modulator available in the stock room. The carrier generator available generates not cos wet, but cos³ wct. M(f) km(t)cos³ w.t m(t) A Filter а (b f -B В cos³ wct a) b) Sketch the signal spectra at points a and b. Is it possible to realize a DSB-SC modulator as in the figure above? (If yes) what kind of filter should be used? Comment on the bandwidth of the filter and the minimum and/or maximum frequencies that the filter should allow to pass. c) What is the minimum usable value of w.?
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