A communication system uses low noise front-end receiver as shown in the Figure below. The antenna has an effective noise temperature T = 50 K. The receiver has noise bandwidth, B= 120 MHz, operate at room temperature T,=290K and is driving a load of 600 2. Antenna Receiver Tat Amplifier 2, F2= 3B G2=6 B Amplifier 3 Preamplifier, T= 60 K, G1=15 dB (S/N), F3= 6B Si G3= 0 (i) Calculate the overall effective noise temperature of the receiver. (ii) Evaluate the output noise voltage and power. (iii) Evaluate the S/N at the input and output of the receiver for input power Si uW. 0.05 %3D (iv) Calculate the minimum input power requires to support a communication with output SNR greater than 20 dB. (v) Explain why it is important to have a low noise figure in the first stage of an amplifier than in other stages.

A communication system uses low noise front-end receiver as shown in the Figure below. The antenna has an effective noise temperature T = 50 K. The receiver has noise bandwidth, B= 120 MHz, operate at room temperature T,=290K and is driving a load of 600 2. Antenna Receiver Tat Amplifier 2, F2= 3B G2=6 B Amplifier 3 Preamplifier, T= 60 K, G1=15 dB (S/N), F3= 6B Si G3= 0 (i) Calculate the overall effective noise temperature of the receiver. (ii) Evaluate the output noise voltage and power. (iii) Evaluate the S/N at the input and output of the receiver for input power Si uW. 0.05 %3D (iv) Calculate the minimum input power requires to support a communication with output SNR greater than 20 dB. (v) Explain why it is important to have a low noise figure in the first stage of an amplifier than in other stages.