13.5 A 0.35-to-2.6GHz multilevel outphasing transmitter with a digital interpolating phase modulator enabling up to 400MHz instantaneous bandwidth. - Marko Kosunen; Jerry Lemberg; Mikko Martelius; Enrico Roverato; Tero Nieminen; Mikko Englund; Kari Stadius; Lauri Anttila; Jorma Pallonen; Mikko Valkama; Jussi Ryynänen (ISSCC, 2017)