Question

EN Normal No Spacing Question 2. Total: 20 Marks) A) With relevant mathematics and spectra, analyse, whether or not the message of Full AM can be demodulated using the following system. Clearly state any assumptions. (10 Marks) [Ve + m(t)) cos(pt) B2: 5 LPF B3: 5 sin(wpt) Figure Q2: IF demodulator I

Answer 1

2 Question 2 A Given tmet]cos(wift) 9,ct) G Wm -Both the components will be filtered at pf demodulator is as follows: IPF @ Q in AS WIF sin (et) After the Amplitude Modulated signal is passed through the multiplier. The output is as follows het it be y, ct) y, ct) sin (Wirt) Multiply and divide à on both sides = 4, (t) [ ret mct)] )] 260s (wgetsinlwart) y, Ct)= + [vet timet) sin (2W Ift) Ay,ct) = Ve sin (2WIF (cvet met)cos(weet) sin(wgat) 2 2 t) + m(t)sin(2Wqft)- the spectrum of how pass filter be 2 Let Wm »Wm Wm * the Lowpass filter of → 80, message cannot full AM signal be obtained from the above circuit.

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