You are asked to design a DSB-SC modulator to generate a modulated signal Am(t)cos(at) with the carrier frequency f= 300 kHz (@=2лx 300,000). The following equipment is available: (i) a cosine wave generator of frequency 100 kHz; (ii) a ring modulator; (iii) a bandpass filter with adjustable center frequency tunable from 100 kHz to 500 kHz; (iv) a message amplifier with settable gain. (a) Draw a block diagram of a system that will generate the desired signal, and explain how it works. (b) Specify the required center frequency of the bandpass filter. (c) If the modulator output is required to be 400m(t)cos(at), what should be the amplifier gain to be used on the input m(t) to obtain the desired output signal amplitude? (Hint: It is not 400.)

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Frequency Modulation

Frequency modulation is a method or process of encoding the data of a specific signal (analog or digital) by modulating the carrier wave frequency according to the frequency of the modulated signal. Modulated signals are nothing more than information or data that should be conveyed after being converted into electronic signals.