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You are asked to design a DSB-SC modulator to generate a modulated signal Acm(t) cos wet with the carrier frequency fc = 300 kHz (wc = 2n × 300,000). The following equipment is available in the stockroom: (i) a sinewave generator of frequency 100 kHz; (ii) a ring modulator; (iii) a bandpass filter with adjustable center frequency with the tuning range of 100 kHz to 500 kHz. (a) Show how you can generate the desired signal. (b) Explain how to tune the bandpass filter. (c) If the output of the modulator must be 400 · m(t) cos wet, what should be the amplifier gain to be used on the input m(t) to obtain the desired modulator output signal amplitude?

You are asked to design a DSB-SC modulator to generate a modulated signal Acm(t) cos wet with the carrier frequency fc = 300 kHz (wc = 2n × 300,000). The following equipment is available in the stockroom: (i) a sinewave generator of frequency 100 kHz; (ii) a ring modulator; (iii) a bandpass filter with adjustable center frequency with the tuning range of 100 kHz to 500 kHz. (a) Show how you can generate the desired signal. (b) Explain how to tune the bandpass filter. (c) If the output of the modulator must be 400 · m(t) cos wet, what should be the amplifier gain to be used on the input m(t) to obtain the desired modulator output signal amplitude?

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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4.2-5 You are asked to design a DSB-SC modulator to generate a modulated signal Acm(t) cos wct with the carrier frequency fe = 300 kHz (@c = 2n × 300,000). The following equipment is available in the stockroom: (i) a sinewave generator of frequency 100 kHz; (ii) a ring modulator; (iii) a bandpass filter with adjustable center frequency with the tuning range of 100 kHz to 500 kHz. (a) Show how you can generate the desired signal. (b) Explain how to tune the bandpass filter. (c) If the output of the modulator must be 400 - m(t) cos wct, what should be the amplifier gain to be used on the input m(t) to obtain the desired modulator output signal amplitude?
Transcribed Image Text:4.2-5 You are asked to design a DSB-SC modulator to generate a modulated signal Acm(t) cos wct with the carrier frequency fe = 300 kHz (@c = 2n × 300,000). The following equipment is available in the stockroom: (i) a sinewave generator of frequency 100 kHz; (ii) a ring modulator; (iii) a bandpass filter with adjustable center frequency with the tuning range of 100 kHz to 500 kHz. (a) Show how you can generate the desired signal. (b) Explain how to tune the bandpass filter. (c) If the output of the modulator must be 400 - m(t) cos wct, what should be the amplifier gain to be used on the input m(t) to obtain the desired modulator output signal amplitude?
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