3. You are asked to design a DSB-SC modulator to generate a modulated signal $k m(t)Cos(\omega_c t)$ with a carrier frequency if 300kHz. You have available a frequency generator of 100 kHz, a ring modulator and a bandpass filter tuned to 300 kHz.
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The modulated signal is given by km(t)Cos(wct), where k is a constant, m(t) is the message signal, and wc is the carrier frequency. Show more…
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Adi S.
You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos ωct, where m(t) is a signal band-limited to B Hz. Figure 2 shows a DSB-SC modulator available in the stock room. The carrier generator available generates not cos ωct, but cos³ωct. Explain whether you would be able to generate the desired signal using only this equipment. You may use any kind of filter you like. a. What kind of filter is required in Figure 2? [3 marks] b. Determine the signal spectra at points "b" and "c", and indicate the frequency bands occupied by these spectra. [3 marks]
You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos ω_c t, where m(t) is a signal band-limited to 2B Hz (Fig. 1a). Figure 1b shows a DSB-SC modulator available in the stockroom. The carrier generator available generates not cos ω_c t, but cos 3ω_c t. a. Explain whether you would be able to generate the desired signal using only this equipment. What kind of filter is required and what is the value of k? b. Determine the signal spectra at points b and c, and indicate the frequency bands occupied by these spectra. c. What is the minimum usable value of ω_c? d. Would this scheme work if the carrier generator output were cos^2 ω_c t? Explain. e. Would this scheme work if the carrier generator output were cos^n ω_c t for any integer n ≥ 2?
Madhur L.
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