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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What are the two main types of capacitances observed in BJTs?
💡 Hint: Remember, BJTs are bipolar junction transistors.
Question 2
Easy
What effect does parasitic capacitance have on amplifier gain?
💡 Hint: Think about signal paths at higher frequencies.
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 are the main effects of high-frequency parasitic capacitances in transistors?
- Increase gain
- Reduce bandwidth
- Increase power dissipation
💡 Hint: Think about how current paths change with frequency.
Question 2
True or False: The Miller effect increases the effective capacitance seen at the input of an amplifier.
- True
- False
💡 Hint: Consider how voltage gain affects capacitance.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Design a BJT amplifier with a target bandwidth of 1 MHz. Considering the Miller effect and internal capacitances, what values would you choose for Cμ and Cπ in your design to maintain the bandwidth? Assume Av ≈ -10.
💡 Hint: Use the Miller effect equation to relate the capacitances to the bandwidth.
Question 2
Derive the formula for effective input capacitance in a BJT amplifier incorporating the Miller effect and provide a numerical example.
💡 Hint: Consider the definitions of each component in the equation for your calculations.
Challenge and get performance evaluation