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Draw small signal hybrid π equivalent circuit for npn transistor.
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  1. The small Signal resistancerπ.
  2. A dependent current sourcegmVbe.
  • A small signal resistancerπ is defined as,rπ=VbeIb
  • Alternate equation forrπ isrπ=VbeIBQ=βFVTICQ
  • rπ is called as diffusion resistance or base emitter input resistance.Note that value of resistance is depends on Q-point parameters.
  • At output side of …

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