
Principles of Analog Electronics
186
Summarizing
H
ZZ Z
Z
ZZ
Z
ZZ ZZ
||
1
12 3
2
2
23
[]
=
+
+
−
EX
ERC
I
SE 10
Ca
lculate the elements of the admittance matrix
Y
relative to the
T-network represented in Figure 5.18.
ANSWER
Let’s recall the denitions of the
y
and
y
parameters
y
i
v
v
11
1
1
def
y
i
v
v
21
2
1
def
and take into account the equations
iyvyv
iyvyv
1111 12 2
2211 22
To calculate the unknown parameters we refer to the scheme of Figure
5.19, with v
0
.
It is easy to obtain
y
ZZ Z
Z
ZZ
ZZ
ZZ
ZZ ZZ ZZ
1
||
1
11
12 3
1
23
23
12 13
=
+
=
+
+
=
++
Referring to Figure 5.18, the voltage
x
⇒
i
v
Z
x
2
3
=−
and (voltage divider’s rule)
y
21
y
11
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