47.3.5 - Input Impedance
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Practice Questions
Test your understanding with targeted questions
Define input impedance.
💡 Hint: Think about what the amplifier accepts.
What is voltage gain?
💡 Hint: Consider how much the signal is amplified.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does high input impedance help prevent?
💡 Hint: Think about how the circuit interacts with the previous one.
True or False: The ideal voltage gain for a buffer amplifier is less than 1.
💡 Hint: Remember what a buffer does in an amplifier configuration.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Determine the input impedance of a common collector amplifier with configurations leading to a base current of 10 µA, load current of 0.5 mA, β of 120, and resistance of 4.7kΩ.
💡 Hint: Start by calculating each term separately.
Analyze how changes in load capacitance to 10 pF from 100 pF alters the performance characteristics of a common drain amplifier with respect to its upper cutoff frequency.
💡 Hint: Plug into the upper cutoff formula and see the difference.
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