Practice - Effect on Input Resistance (Zinf)
Practice Questions
Test your understanding with targeted questions
What is input resistance (Zinf)?
💡 Hint: Think about how input voltage and current relate.
How does negative feedback affect Zinf in series configurations?
💡 Hint: Consider the effect of opposition to the input current.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the formula for calculating Zinf in series feedback configurations?
💡 Hint: Think about how current flows with feedback.
True or False: Shunt feedback increases the input resistance of an amplifier.
💡 Hint: Consider how input currents behave in shunt feedback.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Consider an amplifier with an open-loop input impedance of 1 MΩ and a feedback factor of 0.005 in a series connection. Calculate the input resistance Zinf. Explain how the result would change if shunt feedback was applied instead.
💡 Hint: Calculate first, then use the feedback topology to explain the difference.
You have a voltage amplifier designed for a sensor with high output impedance. Define appropriate feedback topology and justify your choice based on Zinf calculations. What would happen if shunt topology is incorrectly applied?
💡 Hint: Think about how the feedback informs the interface with the sensor.
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Reference links
Supplementary resources to enhance your learning experience.