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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

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.
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