Varieties of Current Conveyors - Current Conveyors: Variants, Applications and Hardware Implementations - page 336

Fig. 10.26 The block
diagram representation of a
universal voltage conveyor

V X

I X

I Zj

I Yj

X

Z j

V Yj

Y j V Zj

I Y2 I Z2

V Y2 Z 2 V Z2

Y 2

I Y1

I Z1

Y 1

V Y1 V Z1

Z 1

Concluding Remarks
In this chapter, we have described twenty six distinctly different varieties of
current conveyors or extension thereof, which have been proposed by a
number of researchers since 1981 till date. Undoubtedly, the basic CCII

are not only the most simple and versatile of the entire CC family; they are
realizable practically by using commercially available off-the-shelf ICs
(e.g. AD844, PA630, OPA2662, OPA660 and OPA860) and hence, are of
more practical significance. Nevertheless, among the numerous variants
described here, several of them possess quite interesting characterizing equa-
tions, which also appear to be useful from the view point of many specific
applications, as the proposers of such blocks have highlighted.
All the variants of CCs described here have the potential of being fully
integrated in bipolar or CMOS technology and are, therefore, of obvious
interest from the view point of VLSI implementation.
Moreover, if there could be a really universal conveyor from where all the
twenty six variants described here could be realized as special cases, it would
have been perhaps the most versatile building blocks among all varieties
described here in. Although in a number of cases, the proposers of the new
types of CCs have often demonstrated that their proposal can realize several
earlier types of current conveyors as special cases, a really universal conveyor
from which all the above described over two dozen types of conveyors may
be derivable as special cases has not been proposed so far. Obviously, if such

(continued)