Second Generation Controlled Current Conveyors (CCCII) and Their Applications - Current Conveyors: Variants, Applications and Hardware Implementations - page 283

−I 0 (−V 3 R L )

−I 2

I 0

I 2

V 1

R s

I in

−Z

X −Z Y +Z X

C L2

3

1

2

C c3

C c1

+Z Y

Y X −Z +Z

MCCCII MCCCII MCCCII

Fig. 9.37 MCCCII based implementation of the CM third order Butterworth filter (Adapted from
[ 32 ] © 2007 Elsevier GmbH)

I B1

I B2

X

Y

CCCII
1

Z

Y

Z CCCII

X

2

C 2

C 1

Fig 9.38 Current-controllable sinusoidal oscillator [ 37 ]

shown in Fig. 9.38 . The condition of oscillation (CO) and frequency of oscillation
(FO) for this circuit are given by:

r

I B 1 I B 2
C 1 C 2

1

CO C 1 ¼ C 2 andFO f 0 ¼ ð 9 : 53 Þ

: :

ˀ V T

r

1
C 1 C 2

I B

with I B1 ¼ I B2 ¼ I B , one obtains f 0 ¼ ð 9 : 54 Þ

ˀ V T

Thus, the oscillation frequency is linearly tunable by I B .
A somewhat similar yet topological different configuration was introduced by
Fongsamut et al. [ 38 ] which is shown in Fig. 9.39 . For this circuit also CO and FO
remain same as in Fig. 9.38 .
SPICE simulations using transistors PR100N and NR 1001N for realizing CCCII+
and CCCII

both with biasing supplying as 5 V, the capacitor values taken

C 1 ¼ 11 nF, C 2 ¼ 10 nF and the external DC bias current I 0 ¼ I 01 ¼ I 02 was varied