Entc 4350
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ENTC 4350. HOMEWORK SET 3 Chapter 5. Chapter 5, Problem 4. Calculate the noise voltage between dc and 1000 Hz due to thermal agitation in a circuit containing only a 75- W resistor. Chapter 5, Problem 6.

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ENTC 4350

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Entc 4350

ENTC 4350

HOMEWORK SET 3

Chapter 5


Chapter 5 problem 4

Chapter 5, Problem 4.

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


Chapter 5 problem 6

Chapter 5, Problem 6.

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


Chapter 5 problem 7

Chapter 5, Problem 7.

  • 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?


Chapter 5 problem 8

Chapter 5, Problem 8.

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


Chapter 5 problem 10

Chapter 5, Problem 10.

  • Three amplifiers in cascade have the following characteristics:

  • Calculate the noise factor for the entire chain.


Chapter 5 problem 101

Chapter 5, Problem 10.

Convert the noise figures into noise factors:

Use Friis’s equation:


Chapter 5 problem 102

Chapter 5, Problem 10.

Use Friis’s equation:


Chapter 5 problem 11

Chapter 5, Problem 11.

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


Chapter 5 problem 111

Chapter 5, Problem 11.

Use Friis’s equation:


Chapter 5 problem 12

Chapter 5, Problem 12.

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


Chapter 5 problem 13

Chapter 5, Problem 13.

  • 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.


Chapter 5 problem 131

Chapter 5, Problem 13.


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