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Q4) (a) Explain what is meant by the term, modulation, and produce a diagram of an Amplitude Modulated signal in which you clearly differentiate between the carrier and information content of the waveform.

Q4) (a) Explain what is meant by the term, modulation, and produce a diagram of an Amplitude Modulated signal in which you clearly differentiate between the carrier and information content of the waveform.

Introductory Circuit Analysis (13th Edition)
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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Q4) (a) Explain what is meant by the term, modulation, and produce a diagram of an Amplitude Modulated signal in which you clearly differentiate between the carrier and information content of the waveform. A carrier of frequency 900kHz is being Amplitude Modulated (AM) by a modulating signal that is a sine wave at a constant frequency of 4kHz and constant amplitude. The modulation index is less than 100%. Determine the frequency of the upper sideband and lower sideband and total bandwidth of the resultant Amplitude Modulated waveform. (b) (c) If the carrier in part (b) has a peak-to-peak voltage of 12V and the modulating signal has a peak-to-peak voltage of 4V, determine the modulation index, the maximum and minimum voltages of the resultant Amplitude Modulated waveform and the peak amplitude of the upper and lower sidebands. Hence, determine the modulating signal voltage that would result in 100% modulation. Briefly describe the process by which the modulating signal would be extracted from the Amplitude Modulated waveform at a receiver. Using the signal described in part (b) and assuming that the demodulator comprises a simple diode detector, determine a value for the demodulator's time constant and justify your choice. Hence, determine the value of capacitance required if the resistance = 1k. (d)
Transcribed Image Text:Q4) (a) Explain what is meant by the term, modulation, and produce a diagram of an Amplitude Modulated signal in which you clearly differentiate between the carrier and information content of the waveform. A carrier of frequency 900kHz is being Amplitude Modulated (AM) by a modulating signal that is a sine wave at a constant frequency of 4kHz and constant amplitude. The modulation index is less than 100%. Determine the frequency of the upper sideband and lower sideband and total bandwidth of the resultant Amplitude Modulated waveform. (b) (c) If the carrier in part (b) has a peak-to-peak voltage of 12V and the modulating signal has a peak-to-peak voltage of 4V, determine the modulation index, the maximum and minimum voltages of the resultant Amplitude Modulated waveform and the peak amplitude of the upper and lower sidebands. Hence, determine the modulating signal voltage that would result in 100% modulation. Briefly describe the process by which the modulating signal would be extracted from the Amplitude Modulated waveform at a receiver. Using the signal described in part (b) and assuming that the demodulator comprises a simple diode detector, determine a value for the demodulator's time constant and justify your choice. Hence, determine the value of capacitance required if the resistance = 1k. (d)
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