Print Email Facebook Twitter A Wideband Digital-Intensive Current-Mode Transmitter Line-Up Title A Wideband Digital-Intensive Current-Mode Transmitter Line-Up Author Shen, Y. (TU Delft Electronics) Hoogelander, M. (TU Delft Tera-Hertz Sensing) Bootsman, R.J. (TU Delft Electronics) Alavi, S.M. (TU Delft Electronics) de Vreede, L.C.N. (TU Delft Electronics) Date 2023 Abstract A current-mode direct-digital RF modulator (DDRM)-based transmitter (TX) architecture is proposed in this article for energy-efficient wireless applications. To demonstrate its key principles, a 2×13 bit demonstrator is implemented in a 40-nm CMOS technology. This DDRM can operate standalone or as a driver for a common-gate (CG)/common-base (CB) power amplifier (PA). The proposed DDRM is based on current-steering radio frequency digital-to-analog converters (RFDACs) that feature an extra current division path to allow the generation of the optimum current-mode class-B drive profile for the final CG/CB PA, facilitating energy-efficient TX operation without compromising linearity. For this purpose, the DDRM uses signed-IQ mapping combined with a class-B harmonic rejection (HR) technique. In addition, an advanced dynamic biasing technique is introduced to further enhance the TX line-up efficiency in deep power back-off (PBO) region. The DDRM driver standalone can provide 19.6-dBm RF peak output power. It supports a '160-MHz 256-QAM' signal at 2.4 GHz with an adjacent channel leakage ratio (ACLR) of -40.3 dBc and an error vector magnitude (EVM) of -33 dB, without using any digital pre-distortion (DPD). When connected to a CB SiGe PA, the overall TX line-up achieves an output power of 27 dBm and an overall TX system efficiency of 20%. This DPD-free TX line-up achieves an ACLR of -37.7 dBc and an EVM of -30 dB, respectively, when operating with an '80-MHz 64-QAM' signal at 2.2 GHz. Subject Common-gate (CG)/common-base (CB) power amplifier (PA)current division pathdigital pre-distortion (DPD)-freedirect-digital RF modulator (DDRM)dynamic biasingharmonic rejection (HR)IQ-mappingquadrature up-converterradio frequency digital-to-analog converter (RFDAC)TX line-up To reference this document use: http://resolver.tudelft.nl/uuid:b9170689-5fe6-4cfd-ac70-5ec0fbd9bef4 DOI https://doi.org/10.1109/JSSC.2023.3279235 Embargo date 2024-02-25 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 58 (9), 2489-2500 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2023 Y. Shen, M. Hoogelander, R.J. Bootsman, S.M. Alavi, L.C.N. de Vreede Files PDF A_Wideband_Digital_Intens ... ine_Up.pdf 3.2 MB Close viewer /islandora/object/uuid:b9170689-5fe6-4cfd-ac70-5ec0fbd9bef4/datastream/OBJ/view