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

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SUMMARY

The discussion focuses on the BJT small-signal model, specifically addressing the configuration of output resistance and other resistances in the hybrid-pi model. The output resistance, denoted as r_0, is confirmed to be connected between the collector and emitter. A reference to a resource that includes modifications for the Early effect is provided, which clarifies the correct setup of the small-signal model. This resource is essential for understanding the nuances of BJT modeling in circuit analysis.

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  • Familiarity with small-signal analysis techniques
  • Knowledge of the Early effect in transistor models
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KingNothing
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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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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"
 
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