Tadashi Suetsugu Marian K. Kazimierczuk Lossless voltage-clamping of a class E amplifier with a transformer and a diode. 276-279 2003 ISCAS (3) http://dx.doi.org/10.1109/ISCAS.2003.1205009 db/conf/iscas/iscas2003-3.html#SuetsuguK03