Practice Practical Cases With Finite Resistance (92.1.5)

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6 sample questions

Question 1.
Define input resistance in a feedback amplifier.
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Think about where the signal first enters the amplifier.
Question 2.
What does the feedback ratio (β) represent?
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Consider how much of the signal is reused.
3Question 3.
What is the formula for calculating modified input resistance in a feedback amplifier?
- R = R(1 - βA)
- R = R(1 + βA)
- R = R - R_0
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Remember the role of feedback in amplifying resistances.
4Question 4.
True or False: Feedback increases stability in amplifier circuits.
- True
- False
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Think about the effects of feedback on circuit behavior.
Question 5.
You have a voltage amplifier with R = 1000Ω and β = 0.1, A = 10. Calculate the input resistance with feedback.
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Break down the formula step by step.
Question 6.
Explain how a finite feedback resistance affects the desensitization factor in a feedback loop.
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Relate this back to the essential role of feedback in amplifiers.

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