A Quadrature Sinusoidal Oscillator With Phase-Preserving Wide-Range Linear Frequency Tunability and Frequency-Independent Amplitude

摘要

A Gm-C architecture for a quadrature sinusoidal oscillator with phase-preserving wide-range linear frequency tunability is discussed. The topology is characterized by low harmonic distortion, as well as controlled and stable amplitude of oscillation that is independent of the oscillation's frequency and instantaneous frequency changes. The architecture has been implemented for acoustic sonar applications using general-purpose discrete bipolar transistors. The phase-preserving frequency control makes the architecture appropriate for continuous-phase frequency-shift keying modulators as well. Measurements and simulation results are presented and found in good agreement with theory