ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R.. Hambley, ©2005 Pearson Education, Inc.Chapter 13 Bipolar Junction Transistors... ELECTRICAL ENGINEERING:
Trang 1ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Chapter 13 Bipolar Junction
Transistors
Trang 2ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Chapter 13 Bipolar Junction
Trang 3ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
3 Use large-signal equivalent circuits to
analyze
BJT circuits.
4 Analyze bias circuits.
5 Use small-signal equivalent circuits to
Trang 4ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 6V
v I
i
B C
C
V
v I
B
C i
i
Trang 7ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 9ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
COMMON-EMITTER CHARACTERISTICS
Trang 10ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 11Common-emitter Input
Characteristic
Trang 12ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Common-emitter Output
Characteristics
Trang 13ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 16LOAD-LINE ANALYSIS OF A
COMMON-EMITTER AMPLIFIER (Input Circuit)
t R i t v t v
V BB in B B BE
Trang 17ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
LOAD-LINE ANALYSIS OF A
COMMON-EMITTER AMPLIFIER (Output Circuit)
CE C
C
Trang 18ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 23ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
PNP BIPOLAR JUNCTION
TRANSISTORS
Except for reversal of current directions
and voltage polarities, the pnp BJT is
almost identical to the npn BJT.
Trang 24ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 29LARGE-SIGNAL DC CIRCUIT
MODELS
(Active-Region Model)
Trang 30ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
LARGE-SIGNAL DC CIRCUIT MODELS
(Saturation-Region Model)
Trang 31ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
LARGE-SIGNAL DC CIRCUIT MODELS
(Cutoff-Region Model)
Trang 32ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Analysis of the Fixed
Base Bias Circuit
Trang 33ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 41Analysis of the Four-Resistor
Bias Circuit
Trang 42ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
2
1 2
1 1 1
1
R
R R
2
R R
R V
R R
V
V I
Trang 43ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
E E
C C
Trang 44ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 45i b (t) denotes the signal current flowing
into the base, I BQ is the dc current that
flows when the signal is absent, and i B (t)
is the total base current Similar notation
is used for the other currents and
Trang 46ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 49ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 50COMMON-EMITTER AMPLIFIERS
Trang 51ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 52C L
C L
L
R R
R R
R
1 1
v
in oc
Trang 53ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
r R
i
v Z
B 1 1
1
in
in in
L v
o i
R
Z A
G
Trang 54ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
C
Z
Trang 55ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 57The common-emitter amplifier is
inverting and has large voltage
gain magnitude, large current gain, and large power gain.
Trang 58ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
EMITTER FOLLOWERS
Trang 59ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 602 1
2 1
1 1
1
R R
R R
E L
L
R R
R R
R
1 1
R r
R A
Trang 61ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
it
B it
B
Z R
1 1
1
L
π b
i v
Trang 62ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Output Impedance
2
1 1
1
R R
R r
R i
v Z
1 1
Trang 63ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R Hambley, ©2005 Pearson Education, Inc.
Trang 64Even though the voltage gain of the emitter follower is less than unity, the current gain
and power gain can be large.