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In small-signal models, what does the term 'r_pi' represent in a BJT?

Practice Questions

Q1
In small-signal models, what does the term 'r_pi' represent in a BJT?
  1. The input resistance
  2. The output resistance
  3. The transconductance
  4. The base-emitter voltage

Questions & Step-by-Step Solutions

In small-signal models, what does the term 'r_pi' represent in a BJT?
  • Step 1: Understand that a BJT (Bipolar Junction Transistor) is a type of transistor used in electronic circuits.
  • Step 2: Learn that small-signal models are used to analyze how transistors behave with small input signals.
  • Step 3: Recognize that 'r_pi' is a parameter in the small-signal model of a BJT.
  • Step 4: Know that 'r_pi' specifically represents the input resistance at the base of the BJT.
  • Step 5: Realize that this input resistance is important for understanding how the BJT interacts with other components in a circuit.
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