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Confusin on BJT Small-Signal Model (Hybrid-Pi)

  1. Sep 27, 2009 #1
    I'm confused about how exactly the output resistance and other resistances are set up in the small signal model. Is this small signal model correct? Please regard underscores as a subscript. Is r_0 always connected between collector and emitter?
     

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  2. jcsd
  3. Sep 28, 2009 #2

    dlgoff

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    Gold Member

    Hello KingNothing

    Your model doesn't look like what I remember, so I did a little search and found this site that has a similar model for equivalent circuits modified to incorporate Early effect. And yes, the output resistance would be across the collector and emitter.
    http://people.seas.harvard.edu/~jones/es154/lectures/lecture_3/bjt_models/bjt_models.html" [Broken]
     
    Last edited by a moderator: May 4, 2017
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