86.5 - Current Mirror Constructed by BJTs
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Practice Questions
Test your understanding with targeted questions
What is the primary function of a current mirror?
💡 Hint: Think about why we might need constant current in circuits.
Define a BJT.
💡 Hint: What types of charge carriers does a BJT use?
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the role of β in a BJT?
💡 Hint: Think about how much the base current controls the collector current.
True or False: A beta-helper circuit aims to decrease the current output of a current mirror.
💡 Hint: Remember the purpose of adding extra components in circuit designs.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Design a BJT current mirror to achieve a mirrored output of 3 mA. Given the supply voltage of 12V and characteristics of the BJTs used, explain how you would select the resistor value to achieve this.
💡 Hint: Think about the relationship between voltage, current, and resistance, and how those affect your mirrored output.
Calculate the impact of early voltage on a current mirror where V_EA is 100V. How would this affect the output current when varying the load?
💡 Hint: Consider early voltage as part of your equation and analyze how current mirrors behave under changing conditions.
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