A Digitally Programmable CMOS Universal Biquad Filter Using Current-Mode Integrators. - Yuhki Maruyama; Akira Hyogo; Keitaro Sekine (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2002)

A CMOS Current-Mode Band-Pass Filter Using Q-Enhancement Technique. - Yuhki Maruyama; Akira Hyogo; Keitaro Sekine (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)