Multiphase Sinusoidal Oscillators Using Operational Transconductance Amplifiers

Abstract

A multiphase sinusoidal oscillator using multiple-output operational transconductanceamplifiers and grounded capacitors is described. The proposed multiphase sinusoidaloscillator is composed of N cascaded lossy integrators, which can generate N output currentequal-amplitude signals that are equally spaced in phase. The oscillation frequency can beelectronically tunable without affecting the condition of oscillation. The proposedconfiguration also has a simple structure, low component count, low active and passivesensitivities, and is very suitable for IC implementation in both bipolar and CMOS/BiCMOStechnologies. The theoretical results are verified by PSPICE simulation. Simulation resultsshow that a multiphase sinusoidal oscillator can generate a high frequency sinusoidalwaveform.