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Analog ElectronicsTransistor Amplifiers

In the hybrid-pi small-signal model, the BJT output resistance ro associated with the Early effect is approximately?

  • AVA/IC
  • BIC/VA
  • Cbeta times IC
  • DVT times IC
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Correct Answer: A. VA/IC
Explanation: For a transistor biased in active region, ro is commonly approximated as VA/IC, where VA is the Early voltage.
Reference: Standard analog electronics: transistor amplifiers
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