ECET 310 Week 2 Homework 2.1

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1. Assume that a receiver has a first amplifier stage with a 5KW input resistance, a gain of 300, an input audio signal of 20 mV, and an operating temperature of 27oC. When the amplifier is operating with a bandwidth first of 10 MHz, find 2. We have an amplifier with a 1 MHz bandwidth and a 20 μV input signal. The input noise = 1 μV, output signal = 6.0 mV, and output noise = 1 mV. 3. An FM receiver has SNR = 48 at the input and SNR = 12 at the output. Calculate the receiver’s noise figure in dB’s. 4. A 300 Ω resistor is connected across the 300 Ω antenna input of a television receiver. The bandwidth of the receiver is 6 MHz, and the resistor is at room temperature (20oC). Find the noise power and noise voltage applied to the receiver input. 5. The signal at the input of an amplifier has an SNR of 42 dB. If the amplifier has a noise figure of 6 db, what is the SNR at the output (in dB’s) ? 6. A three-stage amplifier is shown. The operating bandwidth is 500 KHz at a temperature of 25o C. The output load is 1000Ω. (a) Calculate the total power gain in dB’s and as a number (b) Calculate the total NF as a number (c) Calculate the output noise power (d) Calculate the output noise voltage 7. The noise input power is 1 pW/Hz. Determine the output noise power.

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1. Assume that a receiver has a first amplifier stage with a 5KW input resistance, a gain of 300, an input audio signal of 20 mV, and an operating temperature of 27oC. When the amplifier is operating with a bandwidth first of 10 MHz, find 2. We have an amplifier with a 1 MHz bandwidth and a 20 μV input signal. The input noise = 1 μV, output signal = 6.0 mV, and output noise = 1 mV. 3. An FM receiver has SNR = 48 at the input and SNR = 12 at the output. Calculate the receiver’s noise figure in dB’s. 4. A 300 Ω resistor is connected across the 300 Ω antenna input of a television receiver. The bandwidth of the receiver is 6 MHz, and the resistor is at room temperature (20oC). Find the noise power and noise voltage applied to the receiver input. 5. The signal at the input of an amplifier has an SNR of 42 dB. If the amplifier has a noise figure of 6 db, what is the SNR at the output (in dB’s) ? 6. A three-stage amplifier is shown. The operating bandwidth is 500 KHz at a temperature of 25o C. The output load is 1000Ω. (a) Calculate the total power gain in dB’s and as a number (b) Calculate the total NF as a number (c) Calculate the output noise power (d) Calculate the output noise voltage 7. The noise input power is 1 pW/Hz. Determine the output noise power.

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