Electrical Engineering Asked by user7058377 on December 24, 2021
from
this BJT small signal I try to solve Z(out) but I find
RC || (ro + RE)
because Z(out) is calculated with ib = 0 => beta ib = 0
from this link too V(in) was calculated
But the expression for Zo given in the book by Boylestad and Nashelsky is
Zo = RC || [ro + β (ro + re) / (1 + β re / RE)]
Can You explain how to retrieve this ?
If you put the equations correctly:
point C : io vo ve ib
point E : vo ve ib
ib def : ve ib
3 unknowns : (vo OR io) AND ve AND ib
to get vo = function(io) OR io = function(vo)
Answered by user7058377 on December 24, 2021
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