Theoretical and experimental research on the current-mode RC oscillators

Abstract

This paper proposes an application of the current using its advantages in harmonic signals generation. Using current-conveyors in harmonic oscillators building, the frequency band of active device is well valorised, comparing with the situation of operational amplifiers using. The author chooses from all RC oscillators the oscillator with Wien network, as one of the most used net for RC oscillators with voltage operating mode. Both variable elements haven't any ground contact so, in working conditions, some issues regarding the screening and driving of these elements will emerge. To solve this problem we propose a RC sinusoidal oscillator circuit, made with current conveyors of second generation (CCII), of which selective network is characterised by a transfer function Wien type. This net is different of standard one, having the both capacitors for frequency adjustment ground connected. It was used current-conveyors of second generation PA 630 Phototronix, where with a structure of current amplifier with differential out comes and a selective network were made.