A 1.2-V 140-nW 10-bit Sigma-Delta Modulator for Electroencephalogram Applications. - Enrique López-Morillo; Ramón González Carvajal; Fernando Muñoz 001; Hakim El Gmili; Antonio J. López-Martín; Jaime Ramírez-Angulo; Esther Rodríguez-Villegas (IEEE Trans. Biomed. Circuits Syst., 2008)