Other Building Blocks Having MTC or CC at Front-end and Their Applications - Current Conveyors: Variants, Applications and Hardware Implementations - page 342

11.2 CC-CFA

Since the internal architecture of the CFA 2 contains a CCII+ followed by a unity
gain voltage buffer, it is, therefore, obvious that a CCCII+ followed by a voltage
buffer would become a CC-CFA. This concept has been studied by Siripruchyanun
et al. in [ 3 ] wherein using bipolar and MOS current mirrors several topologies of
BiCMOS CCCIIs have been studied, ultimately resulting in Bi-CMOS CC-CFA.
In addition, a number of interesting applications have been proposed some of which
are shown here in Fig. 11.1 .

I B

a b

Y W

CC-CFA

I A

X Z

I B2

V 0

I B1

X W

I C

CC-CFA

X W

Z

Y

C 2

W X CC-CFA

Z

Y

CC-CFA

I 0

Z

C 1 Y

c d

I B1

I in

I B1 I B2

C 1

V in Y W

CC-CFA Y Y Z

W

Z CC-CFA CC-CFA

X

+

C

W

X

X

V in1

Z

I B2

+

+

+

−

V in2

V in3

V 0

Y X

C 2

−

−

− CC-CFA

Z

W

e

I B2

I in3

Y W

CC-CFA

X Z

I 0

I B1

I in1

X Z2

CC-CFA

C 1

W

Y Z1

I in2

C 2

Fig. 11.1 The various applications of the CC-CFAs [ 3 ]

2 For an interesting article demonstrating how the basic CCII+ (AD844) can be used to realize a
variety of CCs and other related building blocks, see [ 2 ].