Hardware Reference
In-Depth Information
Fig. 12.25 VM universal
filter using single FDCCII
presented by Kacar and
Yesil (Adapted from [
79
]
©
2010 Springer Science +
Business Media)
FDCCII
V
in
Y
2
Y
3
Y
4
Y
1
Z
A-
V
LP
Z
B
X
A
X
B
C
2
C
1
V
HP
V
BP
R
1
R
2
Experimental and simulation results obtained from a fabricated chip demon-
strated that a WCDMA filter having a programmable bandwidth around 2.1 MHz
and a variable gain of 50 dB is attainable.
Kacar-Yesil biquad Figure
12.25
shows a high input impedance SIMO-type VM
universal biquadratic filter configuration using single FDCCII along with four
passive elements (two grounded capacitors and two grounded resistors) proposed
by Kacar and Yesil in [
79
].
The configuration can realize three filter responses simultaneously. The ideal
port characteristics of FDCCII are given by:
2
3
2
3
2
3
V
XA
V
XB
I
ZAþ
I
ZA
I
ZBþ
I
ZB
1
1100 0
V
Y
1
V
Y
2
V
Y
3
V
Y
4
I
XA
I
XB
4
5
4
5
4
5
110100
000010
0000
¼
ð
12
:
95
Þ
10
000001
00000
1
An analysis of the circuit of Fig.
12.25
(assuming ideal FDCCII as characterized by
the above equation (
12.95
) yields the following VM transfer functions:
C
1
R
2
Ds
1
C
1
C
2
R
1
R
2
1
s
V
LP
V
in
¼
V
BP
V
Iin
¼
and
V
HP
s
2
Ds
V
in
¼
ð
12
:
96
Þ
;
Ds
ðÞ
ðÞ
ðÞ
where
þ
1
C
1
R
2
1
C
1
C
2
R
1
R
2
s
2
Ds
ðÞ¼
þ
s
ð
12
:
97
Þ
Thus, the circuit has the capability to realize three basic filtering functions.
Lee-Chang mixed-mode biquad Lee and Chang [
75
] proposed a mixed-mode
biquad filter employing single FDCCII, two grounded capacitors and three resistors
as shown here in Fig.
12.26
.
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