Varieties of Current Conveyors - Current Conveyors: Variants, Applications and Hardware Implementations - page 324

10.2.14 Modified Inverting CCII

A modified third generation Current Conveyor (MCCIII) was advanced by
Kuntman et al. in 2002 [ 50 ], with the proposed characterization as

2
4

3
5 ¼

2
4

3
5

2
4

3
5

I y
V x
I z 1
I z 2

0 100

1000
0

V y
I x
V z 1
V z 2

ð 10 : 14 Þ

200
0100

It was shown that this modified version results in some flexibility in biquad filter
design using a single-CCIII

based parallel RL simulator and helps in reducing the
total number of passive component count.

10.2.15 Dual-X Current Conveyor

In 2002, Zeki and Toker proposed in [ 51 ]a Dual-X current conveyor (DXCCII) as a
new building block suitable for electronically tunable continues time filter. A
DXCCII is characterized by a following terminal equation.

2
4

3
5

2 3

000
100

I Y
V XP
V Xn
I Zp
I Zn

2 3

V Y
I Xp
I Xn

4 5 ¼

4 5

100
010
001

ð 10 : 15 Þ

It was shown that since V XP ¼

V XN , if MOSFET is connecting between the two X
terminals with a control voltage V c applied at the gate terminal the square nonlinear-
ities of the MOSFET drain current are cancelled out and it is, therefore, given by

ʼ n C ox

where

W
L

I D ¼ ʲ ð V C V Tn Þ V Xp V Xn ʲ ¼ ð 10 : 16 Þ

due to which the MOSFET behaves almost as a linear resistor as long as the
MOSFET operates a triode region. The equivalent resistance value is given by:

1

R eq ¼ ð 10 : 17 Þ

ʲ ð V c V th Þ