Design and verification of stochastic oscillator using multiple ring oscillators and OR-gate for low-voltage operation in 65 nm CMOS

Abstract

In this paper, we present a stochastic oscillator comprising multiple ring oscillators and an OR-gate intended for low-supply-voltage operation for the first time. To achieve low-supply-voltage operation under a wide range of process variations, multiple ring oscillators are employed. By using an OR-gate, the ring oscillator with the lowest voltage can be utilized, which was confirmed by SPICE simulations. The prototype is fabricated using 65 nm CMOS technology. Measurement results show the effectiveness of the proposed oscillator.