Hardware Reference
In-Depth Information
a
V
LP
x
y
1
z+
C
1
DVCC
V
HP
R
2
R
1
z−
y
2
V
in
V
BP
R
3
C
2
b
V
LP
y
1
x
C
1
z−
DVCC
V
HP
R
2
R
1
z−
y
2
V
BP
V
in
R
3
C
2
Fig. 12.2 VM biquads employing single DVCC, proposed by Yuce [
2
]
Fig. 12.3 VM biquadratic
filter proposed by Tangsrirat
and Channumsin [
4
]
R
1
C
1
+
z−
y
1
V
3
+
−
C
2
DVCC
+
y
2
z+
x
V
1
V
0
+
R
2
−
V
2
−
−
s
2
C
1
C
2
R
1
R
2
þ
where D s
ðÞ¼
sC
1
R
1
þ
f
C
2
R
2
ð
R
1
Þ
g þ
1
ð
12
:
4
Þ
The minus and plus signs of the BPF responses correspond to Fig.
12.2a, b
respectively. The ideal filter responses in both the structures can easily be obtained
by selecting R
2
¼
R
1
.
Tangsrirat-Channumsin biquad A VM multifunctional biquadratic filter pro-
posed by Tangsrirat and Channumsin [
4
] using a DVCC along with a minimum
number of passive elements is shown in Fig.
12.3
.
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