Answer to Question #298663 in Electrical Engineering for Eli

Question

1. An RF amplif er has an S/N ratio of 8 at the input and an S/N ratio of 6 at the output. What are the noise factor and noise figure? 

2. A receiver with a 75-Ω input resistance operates at a temperature of 31°C. The received signal is at 89 MHz with a bandwidth of 6 MHz. The received signal voltage of 8.3 μV is applied to an amplifier with a noise figure of 2.8 dB. Find (a) the input noise power, (b) the input signal power, (c) S/N, in decibels, (d) the noise factor and S/N of the amplifier, and (e) the noise temperature of the amplifier.

Answer 1

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