A multi-stage and time-based continuous time SigmaDelta architecture using a gated ring oscillator - Torreño Carrera, Juan Antonio; Paton Alvarez, Susana; Hernandez Corporales, Luis; Prefasi Sen, Enrique Jose; Presicce, M.; Paoli, G. (IEEE International Symposium on Circuits and Systems (ISCAS), 2013, 2013)