86.7.1 - Beta-Helper Circuit
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Practice Questions
Test your understanding with targeted questions
What is the purpose of a Beta-Helper Circuit in current mirrors?
💡 Hint: Think about what happens to base current in a BJT.
Define early voltage and its significance.
💡 Hint: Consider what happens to a transistor’s output as the voltage changes.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does a Beta-Helper Circuit primarily compensate for?
💡 Hint: Focus on the term 'Beta-Helper' and remember what it assists with.
True or False: Early voltage is unimportant in designing current mirrors.
💡 Hint: Reflect on its role in circuit performance.
1 more question available
Challenge Problems
Push your limits with advanced challenges
You have a current mirror circuit that suffers from significant base current loss, resulting in an output that's 20% lower than expected. If the reference current is set at 1.2mA, how can introducing a Beta-Helper improve the situation? Provide calculations.
💡 Hint: Evaluate how beta affects the fraction of the current going into the base.
How would you adjust a current mirror design that currently has an early voltage of 30V to achieve a more stable current output? What are the implications on design choices?
💡 Hint: Consider the relationship between early voltage and the transistor's physical characteristics.
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