A New Oscillator with Effective Phase-Noise/Power Performance

In this paper, a new wide tuning-range LC-VCO circuit working below 2 GHz is presented. The approach is to present a step-by-step design following the established principles in the literature to obtain the minimum phase noise as well as keeping power in a reasonable level The improvement is achieved by using a novel tail stage for enhancement of VCO start-up as well as a new low energy-consuming structure at the switching stage which both contribute to phase noise reduction but by different mechanisms. Simulation results exhibit good near-carrier and far-from-carrier phase noise performance of nearly 187.2 at 50 kHz and 1 MHz with more than 28% tuning range, while the unloaded tank quality factor of 6.5 (at oscillation frequency) is used. Detailed results with comparisons to novel literature are presented.