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venkyelectrical
Asked: 2022-08-03T17:56:10+00:00 In:

3.2.3. Consider the demodulator shown below. The input is DSB-LC AM. As usual, fc B, where B is the bandwidth of m(t). s(t) = (A + m(t)) cos(2πfct) ✲ | · | ✲ LPF Gain= 1 Cutoff fc x(t) y(t)✲ ? z(✲t) = am(t) (a) Using the fact that | cos(2πfct)| = cos(4πnfct), determine a formula for x(t) that has no absolute values. Hint: For DSB-LC, A + m(t) ≥ 0. (b) Determine a formula for y(t). (c) What should the final block subtract so as to obtain z(t) = am(t)? What is a?

3.2.3. Consider the demodulator shown below. The input is DSB-LC AM. As usual, fc B,
where B is the bandwidth of m(t).
s(t) = (A + m(t)) cos(2πfct) ✲ | · | ✲
LPF
Gain= 1
Cutoff fc
x(t) y(t)✲ ?
z(✲t) = am(t)
(a) Using the fact that | cos(2πfct)| =

cos(4πnfct), determine a formula
for x(t) that has no absolute values. Hint: For DSB-LC, A + m(t) ≥ 0.
(b) Determine a formula for y(t).
(c) What should the final block subtract so as to obtain z(t) = am(t)? What is a?

3.2.3. Consider the demodulator shown below. The input is DSB-LC AM. As usual, fc B, where B is the bandwidth of m(t). s(t) = (A + m(t)) cos(2πfct) ✲ | · | ✲ LPF Gain= 1 Cutoff fc x(t) y(t)✲ ? z(✲t) = am(t) (a) Using the fact that | cos(2πfct)| = cos(4πnfct), determine a formula for x(t) that has no absolute values. Hint: For DSB-LC, A + m(t) ≥ 0. (b) Determine a formula for y(t). (c) What should the final block subtract so as to obtain z(t) = am(t)? What is a?

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