81.2.1 - Output impedance should be high
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Practice Questions
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What is the primary purpose of a current mirror?
💡 Hint: Think about how current mirrors interact with voltage fluctuations.
Why is high output impedance important in circuits?
💡 Hint: Consider what happens to current when the voltage changes.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What key characteristic should a current biasing element have?
💡 Hint: Think about the purpose of keeping current stable.
True or False: Current mirrors only function to bias operational amplifiers.
💡 Hint: Reflect on all the applications discussed in the section.
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Challenge Problems
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Devise a current mirror using two BJTs and analyze the design for achieving high output impedance.
💡 Hint: Remember to consider the transistor’s Early effect in your calculations.
Evaluate the limitations of using simple resistors for biasing in comparison to current mirrors in your circuit design.
💡 Hint: Think through several scenarios of circuit behavior under load changes.
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