Ex 4-3:A transmitter transmits an AM/DSB single tone-modulating signal given by3 cos (210³ t) volt with a carrier signal given by 10 cos(2 710ºt) volt,Find:1- Modulation depth.2- USB & LSB frequencies.3- Amplitude of sideband frequencies.4- Efficiency of Transmission.(CH 4) Amplitude ModulationSolution:Am 3 v, A. 10 vfm 10³ Hz, fc=106 Hz31- D= Ame x 100% = x 100%Ac103- Amp. of USB & LSB is30%2- USB frequency is fe + fm = 106 + 10³ = 1.001 MHz,LSB frequency is fc-fm = 106 - 10³ = 0.999 MHzmAc0.3x10= 0.75 voltPs m² 0.3²Pt m²+2 0.3²+24- n = =H.W:=84= 4.3 %By Dr. Hikmat Al-Shamary & Dr. Tariq M. SalmanRepeat the previous example assuming that the modulating signal is given by:0

From the given data,The maximum value of the signal is,The signal is between 0 and -0.998Now,

Ex 4-3: A transmitter transmits an AM/DSB single tone-modulating signal given by 3 cos(2n10³ t) volt with a carrier signal given by 10 cos(2n10°t) volt,Find: 1- Modulation depth. 2- USB & LSB frequencies. 3- Amplitude of sideband frequencies. 4- Efficiency of Transmission. (CH 4) Amplitude Modulation Solution: Am 3 v, Ac 10 v fm 10³ Hz, fe=106 Hz = 3 = X 10 1- D = × 100% 100% = 30% Am Ac 3- Amp. of USB & LSB is 2- USB frequency is fe + fm = 106 + 103 = 1.001 MHz, LSB frequency is fe- fm = 106-10³ = 0.999 MHz = 0.75 volt Ps m² 0.32 4- n = = Pt m² +2 0.3²+2 84 f(t) = By Dr. Hikmat Al-Shamary & Dr. Tariq M. Salman mAc 4 = 4.3% 0.3x10 4 H.W: Repeat the previous example assuming that the modulating signal is given by: 0

Ex 4-3: A transmitter transmits an AM/DSB single tone-modulating signal given by 3 cos(2n10³ t) volt with a carrier signal given by 10 cos(2n10°t) volt,Find: 1- Modulation depth. 2- USB & LSB frequencies. 3- Amplitude of sideband frequencies. 4- Efficiency of Transmission. (CH 4) Amplitude Modulation Solution: Am 3 v, Ac 10 v fm 10³ Hz, fe=106 Hz = 3 = X 10 1- D = × 100% 100% = 30% Am Ac 3- Amp. of USB & LSB is 2- USB frequency is fe + fm = 106 + 103 = 1.001 MHz, LSB frequency is fe- fm = 106-10³ = 0.999 MHz = 0.75 volt Ps m² 0.32 4- n = = Pt m² +2 0.3²+2 84 f(t) = By Dr. Hikmat Al-Shamary & Dr. Tariq M. Salman mAc 4 = 4.3% 0.3x10 4 H.W: Repeat the previous example assuming that the modulating signal is given by: 0

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] Answer the following: (a) Explain the effect of the value of u on the modulation quality of AM-DSB-LC. (b) Explain the frequency conversion of the carrier.
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Q2. A'single tone is modulated using WBFM transmitter. The total power is 450 watts into a 5 2 resistive load. Determine the minimum modulation index, where the average power of the second and third sidebands are equal. Under this condition determine: 1. The average power in all sidebands. 2. The ratio of the first sideband power to the total power. 3. The third sideband power, if the modulation index is reduced to maintain maximum first sideband power and keep wideband transmission.
Problem1: the figure shows multiple modulation schemes for the signal that is given by the dashed line sinusoidal function, the X-axis is the time axis is seconds and the Y-axis is the amplitude. Answer the following: 1. What is the modulation scheme in A? 2. What is the modulation scheme in B? 3. What is the sampling frequency? 4. What is the value of the duty cycle in A?
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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 (m2) m2 b. PsB = Pr m2 PT c. PUSB = PLSB 2+m2 2+m2