A square law demodulate for AM is illustrated in Figure 8 20 Assuming that x c (t) A c 1 am n (t) cos(2 Iuml f c t) and m(t) cos(2 Iuml f m t) cos(4 Iuml f m t), sketch the spectrum of each term that appears in y D (t) Do not neglect the noise that is assumed to be band limited white noise with ban...

Let the predetection filter band width be B T and let the post detection filter bandwidth be B D The ...

A square-law demodulate for AM is illustrated in Figure 8.20. Assuming that x c (t) = A

Question:

A square-law demodulate for AM is illustrated in Figure 8.20. Assuming that x_c(t) = A_c[1 + am_n(t)] cos(2Ï€f_ct) and m(t) = cos(2Ï€f_mt) + cos(4Ï€f_mt), sketch the spectrum of each term that appears in y_D(t). Do not neglect the noise that is assumed to be band limited white noise with bandwidth 2W. In the spectral plot, identify the desired component, the signal-induced distortion, and the noise.

Figure 8.20

x(t) Square-law device y =x2 Postdetection filter У() Predetection Ур () x(t) +n(t) filter