The flipped voltage follower: a useful cell for low-voltage low-power circuit design. - Carvajal, Ramón González; Ramírez-Angulo, Jaime; López-Martín, Antonio J.; Torralba, Antonio; Galán, Juan Antonio Gómez; Carlosena, Alfonso; Chavero, Fernando Muñoz (IEEE Trans. Circuits Syst. I Regul. Pap., 2005)