(b) Figure Q1 shows the front of a receiver consisting of a Low Noise Amplifier (LNA) connected to a radio frequency (RF) amplifier through a transmission line. If the output load is 30002, the system bandwidth is 200 kHz and the ambient temperature is 17°C Determine the Noise Factor (F), Noise Power (N.) and Noise Voltage (Vn) of the output if; (i) The amplifier is noise free and the transmission line is lossless. LNAS have gain of 10 dB, while RF amplifiers have gain of 12 dB. (5 marks) (ii) (iii) Noise figure (NF) for LNA and RF amplifier are 1 dB and 5 dB respectively. The LNA gain and RF amplifier are the same as in part (i). while the transmission line has a loss of 8 dB. Comment on the answers to parts (i) and (ii). Transmission RF V LNA Line Amplifier No

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(b)
Figure Q1 shows the front of a receiver consisting of a Low Noise Amplifier
(LNA) connected to a radio frequency (RF) amplifier through a transmission line.
If the output load is 30002, the system bandwidth is 200 kHz and the ambient
temperature is 17°C Determine the Noise Factor (F), Noise Power (N.) and Noise
Voltage (Vn) of the output if;
(i) The amplifier is noise free and the transmission line is lossless. LNAS
have gain of 10 dB, while RF amplifiers have gain of 12 dB. (5 marks)
(ii)
(iii)
Noise figure (NF) for LNA and RF amplifier are 1 dB and 5 dB
respectively. The LNA gain and RF amplifier are the same as in part (i).
while the transmission line has a loss of 8 dB.
Comment on the answers to parts (i) and (ii).
Transmission
RF
V
LNA
Line
Amplifier
No
Transcribed Image Text:(b) Figure Q1 shows the front of a receiver consisting of a Low Noise Amplifier (LNA) connected to a radio frequency (RF) amplifier through a transmission line. If the output load is 30002, the system bandwidth is 200 kHz and the ambient temperature is 17°C Determine the Noise Factor (F), Noise Power (N.) and Noise Voltage (Vn) of the output if; (i) The amplifier is noise free and the transmission line is lossless. LNAS have gain of 10 dB, while RF amplifiers have gain of 12 dB. (5 marks) (ii) (iii) Noise figure (NF) for LNA and RF amplifier are 1 dB and 5 dB respectively. The LNA gain and RF amplifier are the same as in part (i). while the transmission line has a loss of 8 dB. Comment on the answers to parts (i) and (ii). Transmission RF V LNA Line Amplifier No
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