I'm trying to draw the large transfer characteristics for this common base BJT below. I redrew figure 1 to look like figure 2 so it can help better visualize what's going. I want to plot Vo Vs Vi
I used KVL to come up with this equation -Vcc + RLIc + Vo + Vi = 0
So then Vo = Vcc -RLIc - Vi
Ic = Is x e(Vbe/Vt)
Vo = Vcc - [Is x e(Vbe/Vt)RL) - Vi
My confusion is that the base is grounded. Does this now mean that Vbe = -Vi? Or is it that Vbe = 0 since the base is grounded?
If Vbe = 0 then Vo = Vcc - (IsRL) - Vi
Or Vbe = 0 -Vi then Vo = Vcc - [Is x e(-Vi/Vt)RL] -Vi. Can you please tell me what's right here? Or maybe I get it all wrong then I will need some guidance. Thanks!