Maroldt, S.S.MaroldtBrueckner, PeterPeterBruecknerQuay, RüdigerRüdigerQuayAmbacher, OliverOliverAmbacherMaier, S.S.MaierWiegner, D.D.WiegnerPascht, A.A.Pascht2022-03-122022-03-122012https://publica.fraunhofer.de/handle/publica/377081A digital switch-mode amplifier MMIC integrating an differential amplifier and driver was realized in an 100 nm GaN technology with a transit frequency of 80 GHz. The circuit operates up to a bit rate of 12 Gbps while it was designed for a current-mode amplifier chain. Each of the two driver output channels delivers an adjustable output voltage swing of up to 5 V(PP). Due to the differential amplifier input stage with a very low minimum input voltage swing of 0.5 VPP the MMIC allows a flexible operation used as limiting amplifier or digital preamplifier for a GaN final switch-mode stage. The high output power density of the GaN technology allows a further integration of the final switch-mode power amplifier stage which enables for the first time a fully integrated high power digital transmitter in GaN.enclass-Sdigital transmitterdriver circuitgallium nitrideswitch-mode667conference paper