Hardware Reference
In-Depth Information
Fig. 12.27 ICCII-based
CM universal filter
proposed by Ozoguz
et al. [
88
]
C
1
x
I
0BP
+
z
y
ICCII
1
R
1
I
in
C
2
ICCII
2
ICCII
3
I
0HP
I
0LP
x
y
+
z
+
z
y
x
R
2
Ozoguz-Toker-Cicekoglu biquad Figure
12.27
shows a SIMO-type CM univer-
sal biquad proposed by Ozoguz et al. [
88
] employing three plus type ICCIIs, two
capacitors and two resistors which is based on the implementation of first-order all
pass sections.
A routine analysis of this configuration shows that it realizes the following three
CM transfer functions:
s
2
C
1
C
2
R
1
R
2
Ds
I
0
LP
I
in
¼
1
Ds
I
0
BP
I
in
¼
sC
1
R
2
Ds
and
I
0
HP
I
in
¼
ð
12
:
111
Þ
ðÞ
;
ðÞ
ðÞ
s
2
C
1
C
2
R
1
R
2
þ
whereD
ðÞ¼
sC
1
R
2
þ
1
ð
12
:
112
Þ
Thus, the configuration is capable of realizing LPF, BPF and HPF simultaneously.
Further, by adding the current outputs I
0LP
and I
0BP,
a notch current output can be
obtained and if ICCII
1
is replaced by ICCII
and all three output currents are added
to create another output current, an APF can be realized.
Minaei-Yuce-Cicekoglu biquad The circuit in Fig.
12.28
is a single input six
outputs VM biquad filter using one dual-output ICCII (DO-ICCII), one triple output
ICCII (TO-ICCII), two grounded capacitors and four resistors. This filter structure
proposed by Minaei et al. [
89
] can provide simultaneously both inverting and
non-inverting LPF, BPF and HPF filter functions without any component matching
condition, along with orthogonal control of
ˉ
0
and Q
0
. Assuming ideal ICCIIs, an
analysis of the circuit of Fig.
12.28
yields the following VM transfer functions:
1
C
1
C
2
R
1
R
2
Ds
1
C
1
C
2
R
1
R
2
Ds
V
1
V
in
¼
V
2
V
in
¼
LPF
;
ð
12
:
113
Þ
:
ðÞ
;
ðÞ
s
C
2
R
1
Ds
s
C
2
R
1
Ds
V
3
V
in
¼
V
4
V
in
¼
ð
:
Þ
BPF
:
ðÞ
;
;
12
114
ðÞ
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