An Ultra-Wideband Digitally Programmable Power Amplifier With Efficiency Enhancement for Cellular and Emerging Wireless Communication Standards. - Lutfi Albasha; Chris Clifton; Yoshikatsu Jingu; Alan Lawrenson; Hideshi Motoyama; Souheil Bensmida; Kevin A. Morris; Kazumasa Kohama (IEEE Trans. Circuits Syst. I Regul. Pap., 2016)