Practice Beta-Helper Circuit - 86.7.1 | 86. Numerical examples on current mirror and its applications (Part-A) | Analog Electronic Circuits - Vol 4
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Knowledge

86.7.1 - Beta-Helper Circuit

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is the purpose of a Beta-Helper Circuit in current mirrors?

💡 Hint: Think about what happens to base current in a BJT.

Question 2

Easy

Define early voltage and its significance.

💡 Hint: Consider what happens to a transistor’s output as the voltage changes.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does a Beta-Helper Circuit primarily compensate for?

  • Voltage drops
  • Base current losses
  • Collector current variations

💡 Hint: Focus on the term 'Beta-Helper' and remember what it assists with.

Question 2

True or False: Early voltage is unimportant in designing current mirrors.

  • True
  • False

💡 Hint: Reflect on its role in circuit performance.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

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.

Question 2

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.

Challenge and get performance evaluation