Hardware Reference
In-Depth Information
Fig. 6.23 CCII-based
MIMO-type VM universal
filter proposed by Chen
(Adapted from [
11
]
©
2009
Springer)
V
01
C
1
C
2
R
2
+
R
1
V
i1
CCII-
-
x
+
z
V
02
y
+
V
i2
-
V
i3
R
3
-
CCII-
R
1
V
i2
V
03
x
y
V
01
1
z
2
z
V
i1
y
x
R
2
R
4
CCII-
C
1
CCII-
CCII+
y
y
4
z
V
02
3
z
x
x
R
5
C
2
R
3
Fig. 6.24 VM Notch, HPF, LPF and BPF proposed by Chang [
17
]
V
i
1
þ
s
2
C
1
C
2
R
2
R
3
R
4
R
5
ð
R
1
R
3
Þ
V
i
2
V
o
1
¼
ð
6
:
35
Þ
s
2
C
1
C
2
R
2
R
3
R
4
R
5
þ
sC
1
R
1
R
2
R
5
þ
R
1
R
3
V
i
1
þ
V
i
2
V
o
2
¼
sC
2
C
2
R
3
R
4
R
5
sC
2
R
3
R
4
R
5
þ
R
1
R
5
ð
6
:
36
Þ
s
2
C
1
C
2
R
2
R
3
R
4
R
5
þ
sC
1
R
1
R
2
R
5
þ
R
1
R
3
V
i
1
þ
sC
1
C
2
R
2
R
4
R
5
þ
R
3
R
4
ð
R
3
R
4
Þ
V
i
2
V
o
3
¼
ð
6
:
37
Þ
s
2
C
1
C
2
R
2
R
3
R
4
R
5
þ
sC
1
R
1
R
2
R
5
þ
R
1
R
3
From the above, it may be seen that by appropriate choice of input signal(s), VM
Notch, HPF, LPF and BPF responses can be obtained.
Horng Universal Biquad Two VM filter configurations for possessing high input
impedance employing three plus-type CCIIs and having three inputs were presented
by Horng [
21
]. The first filter circuit is shown in Fig.
6.25
.
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