A Stochastic Oscillator Using Multiple Ring Oscillators and OR-Gate for Low Voltage Operation in 65 nm CMOS

This paper presents a stochastic oscillator using multiple ring oscillators and OR-gate intended for low supply voltage operation for the first time. For achieving low supply voltage operation under considerable process variations, multiple ring oscillators are employed. By using OR gates, the ring oscillator with lowest voltage capability can be utilized, which was confirmed by SPICE simulations. The prototype is fabricated in 65nm CMOS technology. Measurement results shows effectiveness of the proposal.