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2 cards from this section. Quick, good the night before a test.
Define input resistance in terms of feedback systems.
Refer to the discussion on voltage amplification.
What is a desensitization factor?
Think about how the formula relates to feedback.
What is the effect of negative feedback on amplifier gain?
Think about how feedback influences stabilization.
True or False: The desensitization factor is always greater than one.
Consider the formula where desensitization is applied.
Consider an amplifier with R_in = 500Ω, A = 20, and β = 0.05. Calculate the input resistance with feedback and discuss the impact of a load resistance of 200Ω.
Break down the problem step by step, focusing on the effect of load.
If a feedback system has β = 0.02 and A = 50, and you find the open-loop input resistance to be 1000Ω, what will the new input resistance be? Discuss the significance of this change.
Use the feedback formula to analyze the change in performance.
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