
Ampliers: Basic BJT Congurations
451
• The BJT and overall voltage gains, A
vBJT
and A
v
• The BJT and overall output resistances, R
oBJT
and R
o
ANSWER
A
iBJT
= 143.4, A
i
≅ 1.37
R
iBJT
≅ 3.59 MΩ, R
i
≅ 643 Ω
A
vBJT
≅ 0.998, A
v
≅ 0.22
R
oBJT
≅ 31.35 Ω, R
o
≅ 31.3 Ω
EXERCISE 19
Let us consider a dual-output BJT amplier that has two resistor loads,
R
L1
and R
L2
, respectively, connected across the collector-ground and emit-
ter-ground terminals (Figure 11.73).
Here none of the BJT’s terminals are
directly connected to the ground through AC.
Determine the expressions of
• The BJT and overall input resistances,
R
iBJT
and R
i
• The BJT and overall voltage gains at the ...