3.12 In Figure 3.36, the carrier A. cos ot has an amplitude of 20 V and the diode turn-on voltage is Von = 0.7 V. The message signal has a de component and is given by m(t) 2, where i is a constant. The message signal bandwidth is B Hz, and o, > 2xB. Derive an expression for y(t), the output of the AM modulator. A. cos mt R BPF Centered x(1) at o. a+ m(t) Figure 3.36. AM generator for Problems 3.11 and 3.12.