Toru Ezawa Hiroo Sekiya Takashi Yahagi Design of Class DE Amplifier with Nonlinear Shunt Capacitances for Any Output <i>Q</i>. 927-934 2008 91-A IEICE Transactions 4 http://dx.doi.org/10.1093/ietfec/e91-a.4.927 db/journals/ieicet/ieicet91a.html#EzawaSY08