19.1.2 - Equivalent Circuit of Common Emitter Configuration
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Practice Questions
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Define transconductance and explain how it is calculated.
💡 Hint: Think about the characteristics curve of the BJT.
What does $r_{π}$ represent?
💡 Hint: Use the formula $V_T / I_B$ for calculation.
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Interactive Quizzes
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What does transconductance ($g_m$) measure?
💡 Hint: Think about the relationship between input voltage and output current.
True or False: The Q-point is irrelevant when analyzing small signal models.
💡 Hint: Recall the definition of Q-point.
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Challenge Problems
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A BJT operates with an $I_C = 5 mA$, and at a given Q-point, you need to determine $g_m$ if $V_T = 25mV$. Construct the small signal model and analyze.
💡 Hint: Recall the relationship of $g_m$ in terms of $I_C$ and $V_T$.
Given BJT characteristics, define the implications of varying $g_o$ in terms of its impact on output current with changes in $V_{CE}$.
💡 Hint: Explore the passive effects of Early voltage on collector current behavior.
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