Print Email Facebook Twitter A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters Title A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters Author Shen, Y. (TU Delft Electronics) Bootsman, R.J. (TU Delft Electronics) Alavi, S.M. (TU Delft Electronics) de Vreede, L.C.N. (TU Delft Electronics) Date 2022 Abstract This article presents a wideband 2× 12 -bit direct-digital RF modulator (DDRM) operating in a 0.5-to-3-GHz band for 5G transmitters. The proposed digital Cartesian modulator features an advanced IQ-mapping technique to boost RF power by 3 dB and suppress the I/Q image. To verify the proposed concept, a 40-nm CMOS prototype is implemented whose RF peak output power at 2 GHz is more than 14 dBm. It achieves an adjacent-channel leakage ratio (ACLR) of -52 dBc and an error vector magnitude (EVM) of -40 dB for a 20-MHz 256-QAM signal at 2.4 GHz. With a 320-MHz 256-QAM signal, the measured ACLR and EVM performances are better than -43 dBc and -32 dB at 2.4 GHz, respectively, without using any digital pre-distortion. Subject ClocksComputer architectureCurrent-steering digital-to-analog converter (DAC)Delaysdigital pre-distortion (DPD)-freedigital-intensive transmitter (DTX)direct-digital RF modulator (DDRM)I/Q imageIQ-mappingMicroprocessorsmixing DACModulationPA pre-driverPower generationquadrature up-converterRadio frequencyradio-frequency digital-analog converter (RFDAC). To reference this document use: http://resolver.tudelft.nl/uuid:bb9edcb8-6e39-49ee-84d2-dd256a303c5f DOI https://doi.org/10.1109/JSSC.2022.3144362 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 57 (5), 1446-1456 Part of collection Institutional Repository Document type journal article Rights © 2022 Y. Shen, R.J. Bootsman, S.M. Alavi, L.C.N. de Vreede Files PDF A_Wideband_IQ_Mapping_Dir ... itters.pdf 3.53 MB Close viewer /islandora/object/uuid:bb9edcb8-6e39-49ee-84d2-dd256a303c5f/datastream/OBJ/view