Basem Abdelaziz Abdelmagid

Last Name

Abdelmagid

First Name

Basem Abdelaziz

ORCID

0009-0002-4414-8341

Organisational unit

09757 - Wang, Hua / Wang, Hua

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Publications 1 - 10 of 19

Sub-THz transceiver design for future generation mobile communications
Mangraviti, Giovanni; Dehos, Cedric; Puyal, Vincent; et al. (2024)
Key enabling technologies for future wireless, wired, optical and satcom applications
This paper outlines the design considerations necessary to realize an innovative transceiver prototype for future-generation mobile communication, adeptly harnessing the spectrum beyond 100 GHz. The primary innovations and challenges reside in maximizing the efficacy of BiCMOS and indium phosphide technologies, advanced radio frequency (RF) packaging, and the design of high-performance D-band RF frontends. The selection of RF-chip technologies and the integration of densely packed RF packaging are thoroughly defined and justified. Specifications for both transmitter and receiver systems are derived from a meticulous link budget analysis. These preliminary studies and decisions inform the forthcoming tape-outs in this project. The focus remains on developing key transceiver technologies to drive the next generation of mobile communications, surpassing the capabilities of 5G. This includes enhancing data rates, power efficiency, integration density, and minimizing footprint.
A Compact 48-63 GHz 3-dB Transformer-Based Quadrature Coupler with Arbitrary Transformer Coupling Coefficient in 22-nm CMOS FDSOI
Abdelmagid, Basem Abdelaziz; Wang, Hua (2024)
IEEE Microwave and Wireless Technology Letters
This letter presents a novel 3-dB transformer-based quadrature coupler (TFQC) that is based on lumped inductors connected between the coupler ports. Compared to previously reported 3-dB TFQCs that strictly require a coupling coefficient ( k ) of 0.707, the proposed coupler can be designed with any arbitrary k for the transformer (TF), offering a much-expanded design space and scalability across frequency and different technologies. In addition, the required TF’s inductance of the proposed coupler is reduced compared to previous TFQC designs, allowing for a further size reduction. To validate the theory of the proposed coupler, a 48–63 GHz prototype is implemented in a 22-nm CMOS FDSOI technology, occupying an area of 0.017 mm 2 with an average insertion loss (IL) of 1.81 dB.
A Mm-Wave Phase-Time Co-Apertured Transceiver Array with Beam Squinting Mitigation for Wideband Beamforming/Spatial-Nulling
Eleraky, Mohamed; Park, Jeongsoo; Abdelmagid, Basem Abdelaziz; et al. (2024)
2024 IEEE Custom Integrated Circuits Conference (CICC)
A Wideband Bi-Directional Calibration-Free Frequency/Switching-Staggering 360° D-Band Phase Shifter with Frequency-Invariant Codes Achieving < 2.38°/0.63dB RMS-Errors Over 24% Bandwidth
Abdelmagid, Basem Abdelaziz; Liu, Yuqi; Wang, Hua (2025)
2025 IEEE International Solid-State Circuits Conference (ISSCC)
With the increasing need for high data-rate and channel throughput, the D-band (110 to 170GHz) has been actively explored for beyond-5G and 6G wireless communication, sensing, and radar applications [1], [2]. To overcome the severe free-space path loss at D-band, large-scale phased arrays are essential to focus and steer the radiation beams [3]–[5]. As summarized in Fig. 33.4.1 (top), D-band phased arrays come with a list of system challenges, which affects the design requirements of the front-end building blocks, in particular the phase shifters (PSs). First, the array element should fit into a ∼λ/2×λ/2 grid dictated by the antenna spacing (1mm×1mm at 150GHz). This requires compact PSs with a desired bidirectional ability to enable PS sharing between a transmitter and receiver of each element. Second, due to the narrow beamwidth of large-scale phased arrays, accurate beamforming is essential, requiring PSs with 360∘ phase range, accurate phase control (low rms phase error), and sufficiently fine resolution (~4 to 6b). Third, to simplify the phase/gain calibration of the array elements for fast beam forming/steering, PSs with minimum gain variations across phase states (low rms gain error) and phase codes independent of frequency are highly desirable. Fourth, with the compact element area of D-band arrays, low element-level power consumption is necessary to lower thermal density. This either requires active PSs with low DC power or zero-power passive PSs with low insertion loss (IL). Finally, supporting large data-rates demands wideband front-ends, requiring PSs that can achieve all the aforementioned desirable features across wide bandwidths.
Monolithically Integrated Optical Phased Array for Optical Wireless Communication
Kim, Youngin; Kulmer, Laurenz; Keller, Killian; et al. (2024)
Journal of Lightwave Technology
This paper presents a compact and power efficient one-chip optical phased array (OPA) transmitter (TX) for optical wireless communication (OWC). A traveling-wave-electrode Mach-Zehnder modulator (TWE-MZM) and mm-Wave driver, which would traditionally be implemented by bulky off-the-shelf components, are monolithically integrated with a silicon-based 1×64 OPA onto a single chip, reducing an active area of the entire system down to 6.4 mm 2 . Moreover, a co-design and integration of TWE-MZM and mm-Wave driver largely minimizes the parasitics and mismatches of an interface between the TWE and mm-Wave driver. The 64-element optical antenna achieves beam divergence of 0.77˚ and 4.23˚ over transversal and longitudinal direction, respectively. The two-sided beam-steering angles of the array antenna in transversal and longitudinal direction are ±14.3˚ and 6.1˚, respectively, while the side-lobe suppression ratio is 7.81 dB. The co-integrated TWE-MZM and driver support a measured data rate up to 15 Gbps and consume 210 mW. To the best of our knowledge, our proposed electronic-photonic integrated circuit is the first OWC-application OPA TX, which monolithically integrates TWE-MZM, CMOS driver, and OPA all in one-chip.
An Adaptive Fully Integrated Dual-Output Energy Harvesting System With MPPT and Storage Capability
Abdelmagid, Basem Abdelaziz; Hmada, Mahmoud H. Kamel; Mohieldin, Ahmed Nader (2023)
IEEE Transactions on Circuits and Systems I: Regular Papers
This paper presents a fully-integrated adaptive dual-output power management system with storage capability for thermoelectric energy harvesting applications. The first output delivers the load power and is regulated at 1.6 V. This output is provided by the primary path of the system that is implemented using a 5-stage reconfigurable Dickson charge pump. In case of the presence of more available power than the load demand, a secondary path is enabled to store the excess amount of energy on a supercapacitor. This provides the second output of the system that is capable of charging up to about twice the voltage of the first output. Besides storing the excess energy, a new technique using the secondary path is proposed for regulating the first output and achieving the maximum power point tracking of the input source. The proposed system is automatically reconfigured to maximize the end-to-end efficiency with the aid of a finite state machine. The system is implemented in 180nm CMOS technology. It utilizes a total on-chip flying capacitance of 2.1 nF, and operates across an input voltage range from 0.35 V to 1 V. Measurement results show that the system achieves an end-to-end efficiency of 72% at a total output power of 1.24 mW.
A Co-Integrated Optical Phased Array, Mach-Zehnder Modulator and Mm-Wave Driver for Free-Space Communication
Kim, Youngin; Kulmer, Laurenz; Keller, Killian; et al. (2024)
2024 IEEE Custom Integrated Circuits Conference (CICC)
A Time-Modulated Concurrent Steerable Multibeam MIMO Receiver Array With Spectral-Spatial Mapping Using One Beamformer and Single-Wire Interface
Huang, Tzu-Yuan; Lin, Boce; Mannem, Naga Sasikanth; et al. (2023)
IEEE Journal of Solid-State Circuits
This work proposes a wideband 26–33 GHz multiple-input-multiple-output (MIMO) receiver (RX) array that leverages time-modulation operation to achieve concurrent steerable multibeam MIMOs (MB-MIMOs) using only one single array beamformer. Time-modulated arrays (TMAs) introduce time as an additional degree of freedom to concurrently sample and multiplex multiple received signals in various incident angles. In other words, time modulation on the RX array enables spatial-spectral mapping that maps received information in different directions to different frequency components in received spectrum with crossbeam isolation, which can be de-modulated by downstream circuits. Thus, the proposed TM MB-MIMO RX array supports concurrent space division multiple access (SDMA) communication with only one beamformer. Furthermore, with built-in phase shifters, the TM MB-MIMO RX also achieves fast-beam scanning with low hardware complexity. A proof-of-concept 26–33 GHz TM MB-MIMO RX array is implemented in the GlobalFoundries 45 nm CMOS RF silicon on insulator (SOI). The demonstrated RX element shows S11 < − 10 dB across 24–32 GHz, and its maximum conversion gain (CG) is 28 dB with a 3 dB bandwidth of 26–33 GHz. The measured noise figure (NF) is 5.78 dB at 28 GHz with RX input-referred IP 1dB of − 38 dBm. The proposed RX supports wideband-16/64 QAM single carrier modulations with maximum modulation speeds of 2.4/4.2 Gb/s, respectively. The demonstrated MB-MIMO RX array achieves five concurrent beams with good crossbeam isolation using only four-element and one analog beamformer and supports wideband-16/64 QAM single carrier modulations on each beam.
A D-Band Scalable and LO-Less Time-Modulated Multibeam Active Relay Array With Broadcasting Capability for 6G Distributed MIMO Networks
Abdelmagid, Basem Abdelaziz; Choi, Kyung-Sik; Kim, Youngin; et al. (2025)
IEEE Transactions on Microwave Theory and Techniques
This article presents a scalable D-band active reflective relay array that can enable nonline-of-sight (NLOS) wireless communication links with multibeam reception and broadcasting capabilities, targeting 6G distributed MIMO (D-MIMO) applications. By adopting two time-modulated linear periodically time-varying (LPTV) arrays at the receiving and transmitting frontends of the relay, the proposed relay concurrently receives/transmits multiple beams with multiple independent data streams from and to multiple spatially distinct wireless nodes. The local oscillator (LO)-less scheme of the proposed relay further obviates the losses and power consumption of mixers and LO distribution, ensuring a low-cost, low-complexity, and scalable relay array design. As a proof of concept, a D-band 120-GHz relay array prototype with eight-element transmitter (TX) array and eight-element receiver (RX) array is implemented in GlobalFoundaries (GF) 22 nm complementary metal-oxide-semiconductor (CMOS) FD-SOI technology. The prototype relay implementation is fully integrated with on-chip orthogonally-polarized RX/TX antenna arrays. By postprocessing the fabricated chips, substrate grooves are created at the back side of the chips to partially suppress the substrate modes and enhance the isolation between the RX and TX antenna arrays. Over-the-air (OTA) measurement results demonstrate successful 120-GHz 16-QAM 1 and 2 Gbps per beam NLOS wireless links through the relay with an EVM$_{rms}$ of 6.4% and 8.9%, respectively, in the case of one external transmitting node communicating through the relay with up to six receiving nodes. The measurements also demonstrate an EVM$_{rms}$ of 9.5% and 12.2%, respectively, in the case of two external transmitting nodes communicating through the relay with up to five receiving nodes.
An Ultra-Compact and Wideband Transformer-Based Coupler with Arbitrary Phase Difference and Arbitrary Power Division Ratio
Abdelmagid, Basem Abdelaziz; Wang, Hua (2024)
IEEE Transactions on Microwave Theory and Techniques
This article presents a wideband ultra-compact transformer-based lumped coupler that offers an arbitrary phase difference and power division ratio (PDR) between the two output ports, while maintaining input-output matching and isolation conditions. The transformer-based lumped design of the coupler ensures a compact layout and is conducive to on-chip implementations. In addition, the inherent high-order network nature of the physical transformer achieves wideband performance. The design theory of the proposed coupler is analyzed and the closed-form design equations for the values of the components are derived. As a proof of concept, four different 45° /60° prototypes with equal and unequal PDRs are implemented in GlobalFoundries 22-nm CMOS FD-SOI technology at 55–60 GHz. The measurements of the coupler prototypes are in good agreement with the electromagnetic (EM) simulation results and the performance predicted by the theoretical analysis. They demonstrate that the proposed transformer-based coupler with arbitrary phase difference and arbitrary PDR is capable of achieving at least 14 × smaller size compared to previously reported transmission-line/coupled-line implementations and around 15 % –20 % larger fractional bandwidth (FBW) compared to previously reported lumped coupler implementations.

Publications 1 - 10 of 19

Basem Abdelaziz Abdelmagid

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