ee2003 circuit theoryeng.staff.alexu.edu.eg/~bmokhtar/courses/circuit_ii/spring_2017/... · c v v a...
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1
EE2003 Circuit Theory
Chapter 19
Two-Port Networks
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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Two Port NetworksChapter 19
19.1 Introduction
19.2 Impedance parameters z
19.3 Admittance parameters y
19.4 Hybrid parameters h
19.5 Transmission parameters T
19.6 Relationship between parameters
19.7 Interconnection of networks
19.9 Applications
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19.5 Transmission parameters (1)
Assume no
independent source in
the network
221
221
DICVI
BIAVV
−=
−=[ ]
−=
−
=
2
2
2
2
1
1
I
V T
I
V
DC
BA
I
V
where the T terms are called the transmission parameters,or simply T or ABCD parameters, and each parameter has different units.
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19.5 Transmission parameters (2)
0I2
1
0I2
1
2
2
V
IC
V
VA
=
=
=
=
0V2
1
0V2
1
2
2
I
ID
I
VB
=
=
−=
−=A=open-circuit voltage ratio
C= open-circuit transfer admittance
(S)
B= negative short-circuit transfer impedance (Ω)
D=negative short-circuit current ratio
221
221
DICVI
BIAVV
−=
−=
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• A large, complex network may be divided into subnetworks
for the purposes of analysis and design. The subnetworks
are modeled as two port networks, interconnected to form
the original network.
• The two-port networks may therefore be regarded as
building blocks that can be interconnected to form a complex
network.
• The interconnection can be in series, in parallel, or in
cascade.
• Although the interconnected network can be described by
any of the six parameter sets, a certain set of parameters
may have a definite advantage.– For example, when the networks are in series, their individual z parameters
add up to give the z parameters of the larger network. When they are in
parallel, their individual y parameters add up to give the y parameters of the
larger network. When they are cascaded, their individual transmission
parameters can be multiplied together to get the transmission parameters of
the larger network.
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