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ENTC 4350

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ENTC 4350

HOMEWORK SET 3

Chapter 5

- Calculate the noise voltage between dc and 1000 Hz due to thermal agitation in a circuit containing only a 75-W resistor.

- What is the shot-noise level over the bandwidth dc to 20 kHz in a conductor in which 100 mA flows?

- Two noise sources are present in a circuit: a voltage source that produces 50 mV (rms), and a current source in which a 120 nA current flows in a 100-W resistance. What is the average noise voltage of this circuit?

- A circuit has a noise figure of 4.7 dB. Calculate the noise factor.

- Three amplifiers in cascade have the following characteristics:
- Calculate the noise factor for the entire chain.

Convert the noise figures into noise factors:

Use Friis’s equation:

Use Friis’s equation:

- Reverse the order of the amplifiers in problem 10 (i.e. exchange A1 and A3), and recalculate the noise factor. Compare the results.

Use Friis’s equation:

- An op-amp has an open-loop gain of 1,000,000. Calculate the closed loop gain when b = 0.10.

- An EEG signal processes a 10 mV signal in the presence of 125 mV of random noise. Calculate the processing gain and processed SNR if signal averaging of 256 repetitions of the waveform is performed.