Hardware Reference
In-Depth Information
I
in2
I
in3
I
in1
CCII
CCII
CCII
z+
y
x
y
x
y
x
y
x
R
3
z−
z−
z−
C
2
V
in3
R
4
C
1
R1
CCII
V
in1
V
in2
I
0
z+
y
x
V
out
z+
R
5
R
6
R
7
R
2
V
in4
Fig. 12.53 Mixed-mode CCII-based configuration proposed by Abuelma
'
atti and Bentrcia [
134
]
V
in
4
C
1
R
6
þ
V
in
2
C
1
R
5
V
in
1
C
1
C
2
R
1
R
5
s
2
V
in
3
N
r
s
ðÞ¼
s
þ
þ
ð
12
:
190
Þ
I
in
2
C
1
I
in
1
C
1
C
2
R
5
s
2
R
3
I
in
3
þ
s
and
s
2
C
1
C
2
R
1
R
3
R
5
R
6
þ
D
r
s
ðÞ¼
sC
2
R
1
R
4
R
5
þ
R
4
R
6
ð
12
:
191
Þ
From equations (
12.189
) and (
12.190
), various inverting and non-inverting mixed-
mode responses in both VM and CM can be obtained as:
(a) Realization of VM filter responses (
I
in
1
¼
I
in
2
¼
I
in
3
¼
0):
HPF:
V
in
1
¼
V
in
2
¼
V
in
4
¼
0,
V
in
3
¼
V
in
; LPF:
V
in
3
¼
V
in
2
¼
V
in
4
¼
0,
V
in
1
¼
V
in
BPF:
V
in
1
¼
V
in
2
¼
V
in
3
¼
0,
V
in
4
¼
V
in
or
V
in
1
¼
V
in
3
¼
V
in
4
¼
0,
V
in
2
¼
V
in
Notch:
V
in
1
¼
V
in
3
¼
V
in
and
V
in
2
¼
V
in
4
¼
0 with R
1
¼
R
4
and APF:
V
in
1
¼
V
in
3
¼
V
in
4
¼
V
in
,
V
in
2
¼
0 and
R
3
¼
R
4
;or
V
in
1
¼
V
in
2
¼
V
in
3
¼
V
in
,
V
in
4
¼
0
and
R
3
¼
R
6
.
In the above cases, the polarities are referred to the VM outputs, the mixed mode
outputs can be obtained with reverse polarities.
R
4
,
R
5
¼
(b) Realization of CM filter responses (
V
in
1
¼
V
in
2
¼
V
in
3
¼
V
in
4
¼
0):
BPF:
I
in
1
¼
I
in
3
¼
0,
I
in
2
¼
I
in
; LPF:
I
in
2
¼
I
in
3
¼
0,
I
in
1
¼
I
in
HPF:
I
in
1
¼
I
in
2
¼
0,
I
in
3
¼
I
in
; Notch:
I
in
2
¼
0,
I
in
3
¼
I
in
¼
I
in
1
and APF:
I
in
2
¼
I
in
3
¼
I
in
¼
I
in
1
and
R
1
¼
R
6
.
By appropriate selection(s) of input(s), the other modes namely, transimpedance
and transconductance filter responses can also be realized.
The filter parameters
R
4
¼
ˉ
0
and (
ˉ
0
/Q
0
) can be given by:
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