3) (40 pts) An FM modulated carrier is modulated by the following signal:m(t) = 4 cos(2л * (1000) *t) voltsThe modulator uses a frequency deviation of 3 KHz. The unmodulated carrier is:*c(t) = 5 cos(2π (100,000) *t) voltsa) (10pts) What would be a good estimate of the bandwidth of modulated signal? b) (30pt) Using your estimate of the bandwidth, sketch the amplitude spectrum inVolts/Hz of the modulated carrier. Note: Since we are plotting the Amplitudespectrum, the values of S(f) can be negative. You must carefully label allaxes and provide each frequency component values (the x-value) andamplitude (the y-value). Include only the positive frequencies.

Answered: 3) (40 pts) An FM modulated carrier is…

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 2 (a) Briefly explain the advantage of the following Amplitude Modulation (AM) type and state ONE (1) application for each AM type: i. Double Sideband Full Carrier (DSBFC) ii. Double Sideband Suppressed Carrier (DSBSC) iii. Single Sideband (SSB). (b) The AM waveform for the modulated signal is illustrated in Figure 1. i. Calculate the percentage of modulation index, m. ii. State the type of the modulated signal. Justify the answer. iii. Write the equation for the modulated signal. iv. Calculate the percentage of power efficiency. 3V -1IV Figure 1
Draw the Full Duplex ASK diagram if the bandwidth is 18,000 Hz (500 to 18,500). Also find the carriers and bandwidth in both directions. Assume there is no gap between bands.
3.7 A modulating signal is of the form: m(t) = 5 sin (2000nt) and the carrier signal c(t) = 10 sin (20000rt) 1. Determine the modulation index. 2. Find the percentage of modulation. 3. Find the frequencies of the sideband. 4. Find the amplitude of each the side bands. 5. What will be the bandwidth of the modulated signal?
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, similar to that in Figure 3, for the following modulations: AM with the amplitude of the carrier wave being 20 V DSBSC SSB – the lower sideband SSB – the upper sideband
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A Spectrum Analyzer is used to measure: a) Power in da of Fundamental and Harmonic Frequencles b) Power in dB of Fundamental and intermodulation Distortion Products c) Voltages in de of Fundamental and Intermodulation Distortion Products. d) Both a andb
7-24
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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
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
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
1. The Voltage spectrum of FM signal is shown in Figure 1. The maximum amplitude of modulating signal is 5V. Calculate the bandwidth , modulation index ,Carrier frequency, modulating frequency and specify the type of Modulator(narrow band or wide band). 1.54 4.06 4.06 2.45 2.45 0.91 0.91 0.21 0.21 192 194 196 198 200 202 204 206 208 KHz

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