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Fig 7.10 Liu
'
s SRCO
employing
all grounded
passive elements
[
22
]
y
z
CCI+
x
R
1
y
z
CCII−
x
C
1
R
2
R
3
C
2
Fig. 7.11 SRCOs proposed
by Abuelma
y
atti and
Al-Ghumaiz [
28
]
'
z
CCI−
x
C
1
R
1
y
z
C
2
CCI−
x
R
2
R
3
It may be mentioned that the authors of [
28
] had started from a general configura-
tion containing two CCI- and four grounded admittances from which eight special
cases were derived using three/two resistors and two/three capacitors. However,
there are only four distinctly different cases therein (see Table 1 of [
28
]) i.e. circuit
numbered 1 and 3 are same and so are circuit numbered 2 and 4. Likewise, special
cases five and six are the same as well as seven and eight are the same. This can be
easily checked by swapping the
first CCI- alongwith Y
1
and Y
4
'
by
second CCI-
'
'
alongwith admittances Y
3
and Y
2
'
. Equation (
7.30
) can be obtained by selecting Y
1
as parallel combination of R
1
and C
1,
Y
2
as capacitor, Y
3
as resistor and Y
4
as
resistor respectively.
An interesting circuit which also employs two CCII+ and only five grounded
external passive components and yet is able to take cognizance of the X-port
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