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October 25, 2011
ECEN 325
Homework #6
Due:
1132011, 8:00AM
Homeworks will not be received after due.
Instructor:
Sam Palermo
1.
(25 points – 15pts calc., 10pts PSpice)
BJT DC Operating Points and AC small signal parameters.
a) For the BJT circuit below, calculate the DC values for V
C
, V
B
, V
E
, I
C
, I
B
, and I
E
.
Compute the AC
small signal parameters g
m
, r
π
, r
e
.
Assume the transistor β=150
, V
BE
=0.7V
, and V
th
=25.9mV
.
b)
Verify the DC operating points in PSpice.
R
B1
10V
R
C
I
C
V
B
3k
Ω
200k
Ω
R
E1
R
E2
R
B2
100k
Ω
V
C
100
2k
Ω
V
E
I
B
I
E
2.
(25 points – 15pts calc., 10pts PSpice)
Common Emitter Amplifier.
a) For the common emitter amplifier below, calculate the small signal gain A
v
=v
o
/v
i
(from the transistor
base to the output node), the input resistance R
in
, the output resistance R
out
, and the overall voltage gain
G
v
=v
o
/v
s
(from the voltage source to the output node).
Assume that the capacitors act as AC shorts and
that the transistor’s r
o
is infinite (can be neglected).
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This note was uploaded on 01/01/2012 for the course ECEN 325 taught by Professor Silva during the Spring '08 term at Texas A&M.
 Spring '08
 SILVA

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