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

[KingNothing]

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?

 

[dlgoff]

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"