Sinusoidal Oscillator Realizations Using Other Types of Current Conveyors - Current Conveyors: Variants, Applications and Hardware Implementations - page 440

Fig. 13.2 ICCII based
sinusoidal oscillator
proposed by Horng
et al. [ 42 ]

R 3

R 1

z 1−

y

C 1

ICCII

V 0

x z 2+

R 2

C 2

The analysis of this oscillator, assuming ideal ICCII, yields the following CE:

s 2 C 1 C 2 R 1 R 2 R 3 þ sR 1 R 2 C 1 þ f ð C 2 Þ C 2 R 3 g þ 2 R 2 ¼ 0 ð 13 : 2 Þ

From the above CE, CO and FO can be determined as:

C 2 R 3
C 1 þ

CO : R 2 0 ð 13 : 3 Þ

C 2

r

2
C 1 C 2 R 1 R 3

FO

: ω 0 ¼

ð 13 : 4 Þ

Thus, from equations ( 13.3 ) and ( 13.4 ), it is clear that CO can be adjusted by the
grounded resistor R 2 whereas FO is independently controllable through R 1 .A
completely CMOS version is also possible by replacing all the resistors by
CMOS resistors in which case the circuit can be made to function as a voltage
controlled oscillator.
It may be noted that an ICCII can be realized from a DVCC by grounding its
non-inverting Y-terminal. Thus, the circuit of Fig. 13.2 was simulated in SPICE by
using the DVCC of [ 53 ] in the manner described above biased with 1.25 V DC
power supply. Using TSMC 0.18 m CMOS technology, the circuit could produce

oscillations of frequency 1.73 MHz with % THD being no more than 2.22 %.

μ

13.4 ICCII-Based All Grounded Passive Elements

(AGPE) SRCO

Of late, there have many attempts for systematic synthesis of oscillators employing all
grounded elements, based upon the use of pathological elements and the concept
of nodal admittance matrix (NAM) expansions, for, instance see [ 35 , 38 , 39 ].
However, in the following we present a fully uncoupled oscillator supposedly
derived by intuitive method by Toker, Kuntman, Cicekoglu and Discigil in [ 10 ].