Varieties of Current Conveyors - Current Conveyors: Variants, Applications and Hardware Implementations - page 330

V y1

Y 1

I z

V y2

Z

Y 2 V z

MMCC

I x

V x X

Fig. 10.20 The symbolic notation of the MMCC

voltage transfer ratio of 0.9228, current transfer ratio of 0.997, 3-dB bandwidth of
391 MHz and R x of the order of 43

[ 58 ].
Because of the adjoin property, an MIDCC appears to be an useful building
block for converting a given MOCCII based single-input-multiple-output type
biquad into a voltage mode, multiple-input-single-output type biquads using
MIDCCs. In view of a large number of SIMO-type CM universal biquads available
in the literature, it is obvious that this development opens the door for deriving as
many MISO-type VM universal biquads using the adjoint relations between
MOCCII and MIDCC. This, however, does not appear to have been exploited in
the earlier literature yet and therefore, leaves a lot of work still to be carried out.

ʩ

10.2.20 Multiplication-Mode Current Conveyor (MMCC)

The multiplication mode Current Conveyor was introduced by Horng et al. [ 59 ]as
an extension of the differential voltage current conveyor (DVCC).
It block diagram representation is shown in Fig. 10.20 . An MMCC is character-
ized by the terminal equations: I Y1 ¼

I X .
Horng et al. [ 59 ] presented an exemplary CMOS circuit of the MMCC which
was obtained by embedding a CMOS folded Gilbert Cell into positive DVCC and
demonstrated the application of the new building block in realizing a square
summer and an analog divider. In the latter case, it was shown that the number of
current conveyors and the number of extra components required in the proposed
analog divider using MMCCs was much smaller than those required by the tradi-
tional current conveyor based implementations already known in the literature.
The authors of this monograph feel that the full potential of the MMCC is yet to
be realized. Although not discovered yet, however, it appears that MMCCs could
yield novel solutions for realizing voltage-controlled oscillators, voltage-tunable
filters and a host of other functional circuits which could be realized up till now only
by a combination of op-amps and analog multipliers. Thus, there appears enough
scope in devising new applications of the MMCCs.

I Y2 ¼ 0, V X ¼ KV Y1 V Y2 and I Z ¼