- 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
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(a) therms input noise levels
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(b) the audio output levels
the rms output noise levels
- We have an amplifier with a 1 MHz bandwidth and a 20 mV input signal. The input mV, output mV, and output mV.
Find
(a) SNR at the input
(b) SNR at the output
Noise figure
- An FM receiver has at the input and at the output.
Calculate the receiver’s noise figure in dB’s.
- A 300 W resistor is connected across the 300 W 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.
- 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) ?
- A three-stage amplifier is shown. The operating bandwidth is 500 KHz at a temperature of 25o C. The output load is 1000W.
- The noise input power is 1 pW/Hz. Determine the output noise power.
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