Basic Analog Circuit Building Blocks Using CCs and Application of CCs in Impedance Synthesis - Current Conveyors: Variants, Applications and Hardware Implementations - page 95

Fig. 5.16 Two distinctly
different floating negative
impedance configurations
using CCII emerging from
the nullor models of
Fig. 5.14

z

z

CCII-

CCII-

y y

x x

Z L

2

1

z z

CCII- CCII-

y

x x y

Z L

2

1

It may be mentioned that the four CCII+ based structures of Fig. 5.13 as well as
the two CCII based structures of Fig. 5.16 , all are characterized by the terminal

equations: i 1 ¼ i 2 ¼ ( 1/Z L )[V 1 -V 2 ] and represent floating impedance Z L ,

between ports 1 and 2.
In the last, it is also worthwhile to mention that four electronically-controllable
negative resistance converters, each employing two electronically- tunable CCIIs,
have been advanced by Surakampontorn and Thitimajshima in [ 55 ]. Another
scheme of realizing floating current controlled resistance converter using electron-
ically controlled conveyor (ECC) has been reported by Riewruja and

Petchmaneelumka in [ 126 ].

5.2.8 Generalized Function Generator

In their seminal 1970 paper where the second generation current conveyor was
introduced (see reference [ 3 ] of Chap. 1) Sedra-Smith demonstrated how CCIIs
along with ideal diodes can be employed to realize a generalized function generator.
Their proposition is shown here in Fig. 5.17
Assuming the diodes to be characterized by the equation

I s e v d =v T i d ¼ ð 5 : 22 Þ

a straight forward analysis of the circuit, assuming all matched diodes, leads to the
following output equation:

i m 1
1

i m 2
2

i m n
n

I 0 ¼ ::::: ð 5 : 23 Þ

with m 1 þ