Electronically tunable dual-OTA second-order sinusoidal oscillators/filters with non-interacting controls: a systematic synthesis approach

In this paper a novel method of generating canonic sinusoidal oscillators with two operational transconductance amplifiers (OTAs), two grounded capacitors (GCs), and a small number of resistors is introduced. Noninteracting control of the frequency of oscillation (FO) and the condition of oscillation (CO) are realized with the transconductance parameters of the two OTAs respectively. Bandpass (BP) and lowpass (LP) filter functions can also be realized with the same topologies. The independent tuning of the natural frequency /spl omega//sub o/ and /spl omega//sub o//Q of most filters can be realized without changing the topologies.