Design of a hybrid ring oscillator at 1.5/3.0 GHz with low power supply sensitivity

In this paper a hybrid ring oscillator, with oscillation frequency of 1.5/3.0 GHz, is presented with reduced sensitivity for supply variations. An analysis of oscillation frequency variation due to static and dynamic power supply noise, is given. Simulation results show a static supply sensitivity of 1.06% at 200 mV static supply noise and a dynamic supply sensitivity of 2.54% (worst case) as compared to 16.55% dynamic sensitivity of a conventional ring oscillator at 50 mV(peak-to-peak), 10 MHz sinusoidal noise signal. The design is simulated at 180 nm standard CMOS technology at different stages 3/5/7 having a maximum power consumption of 5.2 mW and supply voltage of 1.8 V.