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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

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.

• 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.

• 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.

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

### Chapter 5, Problem 10.

• Three amplifiers in cascade have the following characteristics:

• Calculate the noise factor for the entire chain.

### Chapter 5, Problem 10.

Convert the noise figures into noise factors:

Use Friis’s equation:

### Chapter 5, Problem 10.

Use Friis’s equation:

### 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 11.

Use Friis’s equation:

### 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.

• 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.