LPF vo(t) wo(t) X) Gain=1 B=f 2cos(as) s(t) m(t)=cos(@t) 2cos(@s) -90° -90° Phase Shift Phase Shift LPF Gain=l u;(t) B=f. Vi(t) wi(f) (a) Determine the signals ye(t) 17. (t) wa(t) 4. (t) v. (t) w. (t) and s(t)
LPF vo(t) wo(t) X) Gain=1 B=f 2cos(as) s(t) m(t)=cos(@t) 2cos(@s) -90° -90° Phase Shift Phase Shift LPF Gain=l u;(t) B=f. Vi(t) wi(f) (a) Determine the signals ye(t) 17. (t) wa(t) 4. (t) v. (t) w. (t) and s(t)
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
![The block diagram for a modulator is provided in Figure 2. As can be seen, the modulated signal s(t) is obtained
by taking the difference of in-phase and quadrature signals [wo(t) and w, (t) ]. The modulating signal is: m(t) =
cos(Wm (t)). The two low pass filters have bandwidths equal to the first oscillator' frequency where fo > fm and
unity gains.
u(t)
LPF
vo(t)
w.(t)
Gain=1
B=f.
2cos(ar)
s(t)
m(t)=cos(@t)
2cos(as)
-90°
-90°
Phase Shift
Phase Shift
LPF
Gain=1
u;(t)
B=f,
V:(t)
wi(t)
(a) Determine the signals u, (t), vo(t), wo(t), u (t), v, (t), w, (t) and s(t)
(b) What is the carrier frequency of RF signal in terms of w
(c) Determine the complex envelope, s(t), of the signal](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Faf976e4d-9fa4-42bc-ba12-071f116187b8%2Fa3db888f-1287-453f-b4e8-f371345140b6%2Ffghjaza_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The block diagram for a modulator is provided in Figure 2. As can be seen, the modulated signal s(t) is obtained
by taking the difference of in-phase and quadrature signals [wo(t) and w, (t) ]. The modulating signal is: m(t) =
cos(Wm (t)). The two low pass filters have bandwidths equal to the first oscillator' frequency where fo > fm and
unity gains.
u(t)
LPF
vo(t)
w.(t)
Gain=1
B=f.
2cos(ar)
s(t)
m(t)=cos(@t)
2cos(as)
-90°
-90°
Phase Shift
Phase Shift
LPF
Gain=1
u;(t)
B=f,
V:(t)
wi(t)
(a) Determine the signals u, (t), vo(t), wo(t), u (t), v, (t), w, (t) and s(t)
(b) What is the carrier frequency of RF signal in terms of w
(c) Determine the complex envelope, s(t), of the signal
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