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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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