(b) An AM carrier signal with a peak voltage of 12 V is amplitude modulated with a 1.5 MHz sine wave. The AM modulating voltage has an effective value of 1.5 V. Compute the following: i. The percentage of modulation index, M (2 marks) ii. Explain the effects of the AM signal if it is over modulated (m> 1). (2 marks) ii. Maximum voltage, Vmax and Minimum voltage, Vin (2 marks) iv. From the value obtained in Q4(b)(i) to Q4(b)(iii), sketch the resulting AM waveform with the correct scaling. (3 marks) v. Propose a demodulator circuit used in the receiver. Discuss the advantages and disadvantages of the propose circuit. (3 marks) Generate the noise factor, F and noise figure, NF of the cascaded RF amplifier as shown in Figure Q4(c). i. Fac and NF ABC (2 marks) ii. Face and NFACB (2 marks) From the results obtained in 04(c)(i) and Q4(c)(ii), propose the best set of cascaded RF amplifier for a communication system. Give reasons of your choosing. (3 marks) (c) ili. (b) An AM carrier signal with a peak voltage of 12 V is amplitude modulated with a 1.5 MHz sine wave. The AM modulating voltage has an effective value of 1.5 V. Compute the following: i. The percentage of modulation index, M (2 marks) ii. Explain the effects of the AM signal if it is over modulated (m> 1). (2 marks) ii. Maximum voltage, Vmax and Minimum voltage, Vin (2 marks) iv. From the value obtained in Q4(b)(i) to Q4(b)(iii), sketch the resulting AM waveform with the correct scaling. (3 marks) v. Propose a demodulator circuit used in the receiver. Discuss the advantages and disadvantages of the propose circuit. (3 marks) Generate the noise factor, F and noise figure, NF of the cascaded RF amplifier as shown in Figure Q4(c). i. Fac and NF ABC (2 marks) ii. Face and NFACB (2 marks) From the results obtained in 04(c)(i) and Q4(c)(ii), propose the best set of cascaded RF amplifier for a communication system. Give reasons of your choosing. (3 marks) (c) ili