A CMOS Ring Oscillator VCO with Quadrature Outputs and High-Tuning Range

This paper presents the design of a new four-stage ring oscillator with quadrature outputs using a 0.13μm CMOS 1P8M technology. The oscillator utilizes feed-forward technique and negative resistance to reduce the delay per stage and provides high frequencies. Employing single PMOS transistor to vary the load impedance allows reaching ultra-wide tuning range… CONTINUE READING