2/5 A sinusoidal message signal with frequency fm is applied to an FM modulator with modulation index B=3. Let the carrier be given by c(t) =10cos(27 f!). a. Find the effective bandwidth of the modulated signal. b. Determine how many harmonics should be selected to contain 75% of the modulated signal power. c. The output of the FM modulator is passed through an ideal bandpass filter centered at fe with bandwidth k.f, where k is some constant number. If k = 3, plot the spectrum of the output of the ideal bandpass filter. Also, determine the power at the filter output. Following Bessel function values may be useful: n 1 3 4 5 Jn (3) - 0.260 0.339 0.486 0.309 0.132 0.043 2.

2/5 A sinusoidal message signal with frequency fm is applied to an FM modulator with modulation index B=3. Let the carrier be given by c(t) =10cos(27 f!). a. Find the effective bandwidth of the modulated signal. b. Determine how many harmonics should be selected to contain 75% of the modulated signal power. c. The output of the FM modulator is passed through an ideal bandpass filter centered at fe with bandwidth k.f, where k is some constant number. If k = 3, plot the spectrum of the output of the ideal bandpass filter. Also, determine the power at the filter output. Following Bessel function values may be useful: n 1 3 4 5 Jn (3) - 0.260 0.339 0.486 0.309 0.132 0.043 2.

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...

See similar textbooks

Similar questions

One input to a conventional AM modulator is a 600 kHz carrier with amplitude of 22 V. The second input is a 20 kHz modulating signal that is of sufficient amplitude to cause a change in the output wave of +9 V. Determine: a. Upper and lower side frequencies. b. Percent modulation. c. Peak amplitude of the modulated carrier and the upper and lower side frequency voltages. d. Maximum and minimum amplitudes of the envelope. e. Expression for the modulated wave. Then, f. Draw the output spectrum. g. Sketch the output envelope.
4. Write down the general expressions of frequency modulated signal and phase modulated signal. And show the methods to generate FM signals.
in FM , the maximum allowable frequency deviation is 4kHz and the frequency deviation by noise is 156.42HZ? then the signal to noise ratio is .......
What is the graph of the FM and PM magnitude spectrum with sine modulation?
12- A DVM measure... a- peak value. b- RMS value. Average value. d- peak to peak value. 13 The study of energy distribution across the frequency spectrum of a given electrical signal is done by a Distortion meter b-wave analyzer.
b) A carrier is frequency-modulated with a sinusoidal signal of 2 KHz resulting in a maximum frequency deviation of 5 KHz calculate: 1- The modulation index. 2- The bandwidth of the modulated signal. 3- The amplitude of the modulating sinusoidal is increased by a factor of 3 and its frequency is lowered than to 1KHZ . Find the maximum frequency deviation and the bandwidth of the new modulation signal
Discuss how the circuit produces a Frequency Modulated Signal
Question 4 (a) A carrier and a modulating signals are shown in Figure 2. Sketch and label the modulated output signal in time domain for: i. the Frequency Modulation (FM) i. the Phase Modulation (PM). Carrier signal Modulating signal Figure 2 (b) The FM and PM modulators parameters are shown in Table 1. Table 1 FM modulator Deviation sensitivity 6 kHz/v Carrier frequency = 400 kHz Modulating signal = sin (2n 4 kr) PM modulator Deviation sensitivity 1.6 rad/v Carrier frequency = 300 kHz Modulating signal = 1.25 sin (2n 5 kr) i. Calculate the modulation indexes for both modulators. i. Sketch and label the frequency spectrum for both modulators.
Q2. An angle modulated signal with a sinusoidal carrier 100 cos Znfat and a sinusoidal message with frequency fa-20 Hz, knowing that -0.7, a) Draw the single sided spectrum b) Determine the modulated signal bandwidth. c) Determine the 70% and 90% bandwidth and transınitted power.
Obtaining broadband FM signal from narrowband frequency modulated (FM) signal is shown below. The narrowband FM signal has a maximum frequency deviation of 100 Hz. The frequency of the local oscillator is f0=100 kHz. Obtaining broadband FM signal from narrowband frequency modulated (FM) signal is shown below. The narrowband FM signal has a maximum frequency deviation of 100 Hz. The frequency of the local oscillator is f0=100 kHz.Since the broadband FM signal has a carrier frequency of fc=80 MHz, find the N value.
3. The role of mixer in the Armstrong modulator is to. a) raise the carrier frequency b) lower the carrier frequency c) to change the carrier frequency to any required value For AMDSB-SC, The carrier is suppressed using a) A mixer b) A frequency multiplier c) A balance modulator 5. In FM modulation, frequency deviation is equal to .........., if the amplitude of the modulating signal is 4 V, and the frequency sensitivity of the modulator is 30 Hz/V. a) 120 Hz b) 34 Hz c) 100 Hz 6. A voltage controlled oscillator (VCO) is an oscillator that its frequency output is varied according to any change in the ............... at its input. 4. a) Frequency b) Current c) Voltage Q1: (B) Draw A block diagram to generate the SSB using Hilbert Transform method, Write an equation for an input, and output signals?
2. Briefly explain the process of indirect FM generation using a phase modulator.