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CCII+
R
6
I
0
y
x
z
V
6
R
8
V
0
CCII+
V
7
z
x
R
10
z
y
I
in1
V
3
CCII+
CCII+
R
5
y
x
y
x
x
z
z
z
y
C
3
C
1
I
in3
R
2
R
4
V
2
CCII+
CCII+
V
1
y
y
z
z
I
in2
V
4
x
x
R
9
V
5
R
7
Fig. 12.54 Mixed-mode CCII-based filter proposed by Abuelma
atti et al. [
135
]
'
r
R
4
C
1
C
2
R
1
R
3
R
5
and
ω
0
R
4
C
1
R
3
R
6
ω
0
¼
Q
0
¼
ð
12
:
192
Þ
Hence,
ˉ
0
can be tuned by adjusting the resistances R
1
and /or R
5
independently
without disturbing the bandwidth which is controllable by R
6
.
Abuelma
'
atti-Bentrcia-Al-Shahrani mixed-mode biquad Another mixed-mode
CCII-based filter configuration was presented by Abuelma
atti et al. [
135
] as shown
'
in Fig.
12.54
.
This filter circuit is capable of realizing all the standard filter functions from the
same topology. The filter parameters
ˉ
0
/Q
0
) are independently controllable.
Assuming ideal CCIIs+, the analysis of the proposed filter yields the following
transfer functions:
ˉ
0
and (
N
1
s
and
I
0
¼
N
1
s
R
10
R
8
ðÞþ
N
2
s
ðÞ
1
R
8
ðÞþ
N
2
s
ðÞ
V
0
¼
ð
12
:
193
Þ
D
r
s
ðÞ
D
r
s
ðÞ
V
2
s
2
C
1
C
3
R
5
s
C
1
R
4
1
R
7
V
5
1
R
2
N
1
s
ðÞ¼
ð
V
3
V
7
Þ þ
ð
V
7
Þ
ð
12
:
194
Þ
1
R
2
R
4
1
R
6
V
6
1
R
9
V
4
þ
ð
V
7
Þ
ð
V
1
Þ
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