Problem 2:Consider aDSB-SC system:modulating signal:m(t)= 2 cos4000 πt +5 cos 6000 Jitcarrier signal: c(t) = 100 cos 257fctwhere f= 50kHz.Determine and sketch the spectrum of themodulated signal.

Answered: Image /qna-images/answer/40907176-23b1-4432-8c78-b52fa63b3aee.jpg

Answered: Problem 2: Consider a DSB-SC system:…

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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Q2: A modulating signal is used to modulate a carrier signal(AM modulation). Let Pr . Pc. PSB. PuSB. PLSB and u are the total power, carrier power, side band power, upper side band power, lower side band power and modulation index respectively. Prove the following: a. Pc = Pr () c. Pusn = Pisn =) Pr m2 b. Psn = Pr %3D 2+m2 LSB 2+m? (2+m2
A 1500 KHz carrier with amplitude of 50 V is amplitude modulated by 2 –KHz sine wave tone with a peak voltage of 15 V. Determine the modulation index, percent modulation, the upper and lower sideband frequencies, bandwidth of the wave, and write the AM equation.
An AM transmitter at 27 MHz develops 10W of carrier power into a 50-ohm load. It is modulated by 2-kHz sine wave between 20% and 90% modulation. Determine maximum and minimum waveform voltage of the AM signal at 20%. Ans: Vmax=37.94V and Vmin=25.3V
Modify this circuit to extend the upper frequency limit to greater than 15 MHz. You may change the topology (i.e. configuration), but not the power supply voltage or collector bias current. The circuit voltage gain must be 46dB +/- 1 dB. Provide simulation results to show AC frequency responses of both circuits on the same plot, and annotate the 3dB upper frequency limit on both traces. Use typical ẞ values from the data sheet for the simulation. You may assume that 1% resistors are available in values below 100. The circuit must adhere to Standard Bias techniques. V4 Rser=0 SINE(0 0.02 10k) AC 1 VCC ୯ V2 +15V Cin1 1μ -VCC VCC R4 Rc1 147k 7k Q3 2N3904 R7 R6 9.09 20.5k Ce1 Re1 1.00k 10p Out
A baseband signal has the spectrum sketched in the first image added below. The baseband signal modulates a 98 kHz carrier sine wave. Using frequency and amplitude labelling similar to that in Figure 2, sketch the spectrum of the modulated signal using a template added in image 2, for the following modulations: i-AM with the amplitude of the carrier wave being 20 V ii-DSBSC iii-SSB – the lower sideband iv-SSB – the upper sideband
.
A carrier signal is amplitude modulated by a sinewave. The resulting AM waveform is shown below. 3.5V- 1V- a) What is the amplitude of the carrier signal? b) c) To achieve 75 percent modulation, what amplitude of the modulating signal is needed? d) Calculate the effective voltage of the AM signal What is the modulation index?
Question 3 a) For a single-frequency sine wave modulating signal of 3 kHz with a carrier frequency of 36 MHz, what is the spacing between sidebands? b) A carrier of 49 MHz is frequency-modulated by a 1.5-kHz square wave. The modulation index is 0.25. Sketch the spectrum of the resulting signal. (Assume only harmonics less than the sixth are passed by the system.)
Q2: Draw the output PSK waveform for the digital data: Input signal Carrier Input Q: What is the main benefit of measuring the scattering parameters of RF network?
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Problem 2: Consider a DSB-SC system: modulating signal: m(t)= 2 cos4000 πt +5 cos 6000 Jit carrier signal: c(t) = 100 cos 257fct where f= 50kHz. Determine and sketch the spectrum of the modulated signal.