Practice - High-Frequency Transistor Models: Capacitive Effects in BJTs and FETs
Practice Questions
Test your understanding with targeted questions
What are the two main types of capacitances observed in BJTs?
💡 Hint: Remember, BJTs are bipolar junction transistors.
What effect does parasitic capacitance have on amplifier gain?
💡 Hint: Think about signal paths at higher frequencies.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What are the main effects of high-frequency parasitic capacitances in transistors?
💡 Hint: Think about how current paths change with frequency.
True or False: The Miller effect increases the effective capacitance seen at the input of an amplifier.
💡 Hint: Consider how voltage gain affects capacitance.
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Challenge Problems
Push your limits with advanced challenges
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.
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.
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