Wide-tuning-range,low-phase-noise quadrature ring oscillator exploiting a novel noise canceling technique

This paper presents a novel noise-canceling technique, which is used to improve the phase noise of a two-stage quadrature ring oscillator. The thermal noise canceling circuitry is used to cancel the channel thermal noise of the output transistors in each stage of the oscillator. Simulations using TSMC 0.13 μm CMOS technology show a wide frequency tuning range of 315 MHz to 6.64 GHz and ?97.5 dBc/Hz at 1 MHz offset from 4.7 GHz for changing supply from 0.5 V to 1.6 V. The power consumption is obtained to be 14.8 mW. The proposed oscillator can be used in applications such as ultra-wideband systems, and multiband and multimode receivers.