Analog Filter Design Revisited: Circuit Configurations Using Newer Varieties of CCs - Current Conveyors: Variants, Applications and Hardware Implementations - page 396

Fig. 12.30 MIMO-type
CM biquad proposed by
Chen [ 98 ]

DO-ICCII
y z 1+

C 1

1

z 11+

x

I 01

R 1

DO-ICCII

I i1

z 2+

y

I 02 2

C 2

z 22+

x

R 2

I i2

DO-ICCII

y

z 3+

3

z 32+

x

I 03

R 3

I i3

I i 1 I i 2 þ I i 3

C 1 C 2 R 1 R 2 R 3
Ds

1
C 1 C 2 R 3 R 2

1
C 1 C 2 R 1 R 3

s
C 1 R 1

s 2

I 01 ¼ þ

ðÞ

ð 12 : 119 Þ

I i 1 I i 2 I i 3

C 1 C 2 R 1 R 2 R 3
Ds

s
C 1 R 2

s
C 1 R 1

s
C 1 R 2

s 2

I 02 ¼ þ ð 12 : 120 Þ

ðÞ

I i 2 I i 3

C 1 C 2 R 1 R 2 R 3
Ds

1
C 1 C 2 R 3 R 2 I i 1 þ

s
C 2 R 3 þ

1
C 1 C 2 R 1 R 3

s
C 1 R 1

s 2

I 03 ¼ þ

ðÞ

ð 12 : 121 Þ

where

s 2 C 1 C 2 R 1 R 2 R 3 þ Ds ðÞ¼ sC 2 R 2 R 3 þ R 1 ð 12 : 122 Þ

Case-I
If I i 2 ¼

I in , the following three CM transfer func-
tions namely notch, BPF and LPF can be realized simultaneously:

I i 3 ¼ 0 (open circuited) and I i 1 ¼

s 2 C 1 C 2 R 3 R 2 R 1 þ

I 01

I in ¼

R 1 I 02

I in ¼

ð sC 2 R 1 R 3 Þ I 03

I in ¼

R 1
Ds

ð 12 : 123 Þ

; ;

Ds ðÞ Ds ðÞ ðÞ

By adding I 01 and I 03 an inverting HPF can be obtained as follows