Second Generation Miscellaneous Linear/Nonlinear Applications of Various Types of Current Conveyors - Current Conveyors: Variants, Applications and Hardware Implementations - page 494

a

V in y z− V 01

DOCCII

x z+

V 02

R 1

R 2 R 3

b

+V

I bias2

M 4

M 6

M 3 M 5

M 11

M 9

M 1

M 2

Y

X

Z

R

M 10

M 7

M 8

I bias1 M 12

I bias2

−V

Fig. 15.4 (a) DOCCII-based single-ended to differential converter (b) CMOS implementation
(Adapted from [ 4 ] © 2005 Springer Science + Business Media, Inc.)

one of them requires only two current conveyors with multiple outputs and no more
than two diodes. The first circuit, which implements a current mode precision full-
wave rectifier, is shown in Fig. 15.5a . The circuit has two current outputs, each one
of them being given by the following equation:

i Oþ t ðÞ ¼ j i in t ðÞ j , i O t ðÞ ¼ j i IN t ðÞ j ð 15 : 19 Þ

It may be noted that this rectifier has very low input impedance and a very high
output impedance at both the output terminals.
For the voltage mode precision rectifier of Fig. 15.5b , a straight forward analysis
reveals that