a) Consider the Double Sideband Suppressed Carrier (DSB-SC) modulation system shown in Figure Q3. The output current io and the input voltage V; of the ideal nonlinear device are related by io = aV + a3V. Here, a and a3 are constants. The mid-band frequency and the bandwidth of the bandpass filter are given as fc and 2W respectively. i) ii) Write a mathematical expression for the output current i, at point A. [2 Marks] Sketch the amplitude spectrum of the i, at point A. Assume that m(t), m (t) and m (t) occupy the frequency intervals -W Nonlinear Device Bandpass A B Filter Ac cos(fet) m(t) Figure Q3: DSB-SC Modulation System. DSB SC Wave