A low power 32 nanometer CMOS digitally controlled oscillator

In this paper, a low power and low jitter 12-bit CMOS digitally controlled oscillator (DCO) design is presented. The CMOS DCO design is based on a ring oscillator implemented with Schmitt trigger based inverters. Simulations of the proposed DCO using 32nm Predictive Transistor Model (PTM) achieve controllable frequency range of around 570MHz∼850MHz with a wide range of 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 and 0.9 power supply.