A 12-bit digitally controlled oscillator with low power consumption

In this paper, a low power and low jitter 12-bit CMOS digitally controlled oscillator (DCO) design is presented. The CMOS DCO is designed based on a ring oscillator implemented with Schmitt trigger based inverters. Simulations of the proposed DCO using 32nm CMOS Predictive Transistor Model (PTM) achieves controllable frequency range of 570MHz∼850MHz with a wide linearity. Monte Carlo simulation demonstrates that the time-period jitter due to random power supply fluctuation is under 75ps and the power consumption is 2.3mW at 800MHz with 0.9V power supply.