Mul, Dieuwert Peter NicolaasDieuwert Peter NicolaasMulBootsman, Rob J.Rob J.BootsmanBeikmirza, MohammadrezaMohammadrezaBeikmirzaEl Boustani, OssamaOssamaEl BoustaniShen, YiyuYiyuShenMaassen, DanielDanielMaassenVelzen, Bart vanBart vanVelzenRousstia, Mohadig WidhaMohadig WidhaRousstiaKoster, RonaldRonaldKosterGajadharsing, John R.John R.GajadharsingFritzsch, ThomasThomasFritzschAlavi, Morteza S.Morteza S.AlaviVreede, Leo Cornelis Nicolaas deLeo Cornelis Nicolaas deVreede2025-04-282025-04-282025https://publica.fraunhofer.de/handle/publica/48702110.1109/ISSCC49661.2025.109046502-s2.0-105000820441Base stations account for 73% of wireless-operators' energy consumption, mainly dominated by their analog-PA-based TXs [1]. All-digital transmitters (DTXs), leveraging custom low-VT RF-power technologies [2], offer substantial energy savings by using switching operation and completely eliminating quiescent currents. In addition, DTXs enable extreme bandwidths since their circuit topology is frequency-agile up to the (power combining) output-matching network. To date, no high-power, high-efficiency DTX solutions have been reported that offer RF-power levels required for mMIMO base stations (Pavg>3W), with the essential fine-gate segmentation and glitch-free operation to support wideband modulated signals. In this work, an 8-phase multi-phase (MP) DTX upconversion with dynamic retiming and a glitch-free phase-mapper operation is proposed (Fig. 5.8.1). The required output power, resolution, and sampling speed are achieved via a high-density flip-chip DTX approach with a high-speed DTX controller placed on a custom low-VT LDMOS MMIC featuring power switch banks with in-finger gate segmentation (Fig. 5.8.1).enfalseconference paper