combine the Darlington

[mtkee2003]

hi

if we want to medel the "BJT Darlington stage" with only one BJT, what is that model.

regards

 

[Sal]

Hi

it is same as one BJT, just the current gain is Beta1*Beta2

 

[mtkee2003]

hi Sal,

your model is an approximate model.

for example it is not true about ro_1 and ro_2.(output resistances of each BJT)

regards

 

[throwaway18]

Also the base to emitter voltage will be around 1.4V instead of 0.7V when the transistor is on.

 

[A.Anand Srinivasan]

you just gotta model a BJT with a Vbe drop of 1.4V that's all