Variable frequency sinusoidal oscillators based on CCII+

Using the two-integrator loop biquadratic general structure and positive second-generation current conveyor (CCII⁺) as the active elements, a set of variable frequency sinusoidal oscillators is synthesized. Some of the derived structures are new and three of them have been carefully analyzed because of their special interest at high frequency. Experimental results show an excellent agreement with theoretical predictions. Finally, it is shown that an extensive relation of oscillating configurations reported in the literature could be derived from the general block diagram proposed in this paper