PLEASE SHOW ALL WORK IN ORDER TO RECIEVE FULL CREDIT. PLEASE DO QUESTION 1 Quest

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PLEASE SHOW ALL WORK IN ORDER TO RECIEVE FULL CREDIT.

PLEASE DO QUESTION 1

Question 1: Suppose an ideal and an ideal bandpass filter are placed in series. The bandstop filter has center frequency 40 20 and is off band of width 20 kHz. The filter band of width kHz. The composite system is also bandpass. The center frequency of the composite system is denoted fe, and it is on over a band of width W. Determine fe w. Choose the closest answer. A: 70 kHz. B: 55 kHz. C: 60 kHz. D: 65 kHz. E: 50 kHz. Question 2: Suppose m(t) is a periodic signal with power Pm and maximum and minimum values mmax b and mmin b. Suppose DSB-LC AM is to be used; that is, s(t) (A+m(t))cos(2mfet), where A is the minimum value required for DSB-IC AM. Determine the power efficiency. Choose the closest answer A: 25%. B: 10% C: 5%. D: 15%. E: 20%. Question 3: suppose m() 24 cos t 6 cos (24mt). Determine peak frequency viation if frequency modulation is used with kn A. Choose the closest answer. A: 36. C: 18. D: 12. E: 30.

Explanation / Answer

E 20 %

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