Article
Engineering, Electrical & Electronic
Ciaran Feeney, Junchao Yu, Shanfeng Peng, Tincong Ye, Shiyou Yang, Ningning Wang
Summary: This work introduces a stacked winding thin film magnetic core microinductor to enhance the ratio of inductance to dc resistance (DCR) and presents an improved ac winding loss model. The study demonstrates that the total DCR of the stacked winding inductor is reduced by approximately 25% compared to the corresponding single layer structure with equivalent inductance and device area.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Engineering, Electrical & Electronic
Chandra Shetty, Youssef Kandeel, Liang Ye, Seamus O'Driscoll, Paul McCloskey, Maeve Duffy, Cian O. Mathuna
Summary: This work presents analytical expressions for the dc inductance of 3-D air-core inductors with different cross-sectional pillars and discusses the effects of high frequency on inductance. The proposed analytical models show good agreement with numerical analysis and measurement results, providing accurate predictions for various inductor structures.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Proceedings Paper
Energy & Fuels
Cian O. Mathuna, Seamus O'Driscoll
Summary: This talk will discuss the performance opportunities and technology challenges of heterogeneous integration of power converters into processor packages through methods like PCB embedding, 2.5D or even 3D packaging. The emergence of magnetics-on-silicon technology and PCB-embedded magnetics technologies, along with integrated high density capacitor technologies, PMICs and power switches, are central to the development of integrated power solutions for multi-core microprocessors and other complex SOC platforms.
2022 24TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'22 ECCE EUROPE)
(2022)
Article
Engineering, Electrical & Electronic
Declan Jordan, Guannan Wei, Liang Ye, Daniel Lordan, Pranay Podder, Ansar Masood, Kenneth Rodgers, Cian O. Mathuna, Paul McCloskey
Summary: This article explores a novel method of integrating multilayer thin film magnetics in PCBs for Power Supply in a Package (PwrSip) applications. The solenoid inductor structure uses a multilayer CZTB magnetic sheet and achieves low R-dc values. Furthermore, the fabricated flip-chip inductor demonstrates a peak quality factor of 23 at 40 MHz.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Kang Wei, Jin Woong Kwak, D. Brian Ma
Summary: This article presents an encrypted on-chip power supply to protect crypto cores from power and electromagnetic (EM) side-channel attacks. It utilizes random parallel power injection and charge recycling to encrypt supply power activities, reducing power and performance overheads. The power supply maintains an uncorrelated input profile and attenuates EM leakage through spreading spectrum energy and increasing noise floor. A prototype IC with a 65nm CMOS process is fabricated, demonstrating improved power SCA immunity and meeting EM spectrum profile encryption standards. The power supply achieves high efficiency and minimal power overhead.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Biotechnology & Applied Microbiology
Joseph R. Boyd, Cong Gao, Kathleen Quinn, Andrew Fritz, Janet Stein, Gary Stein, Karen Glass, Seth Frietze
Summary: peaksat is an R package that estimates target read depth for epigenomic sequencing experiments based on peak saturation curve analysis. It provides insight into the specific read depth requirements for ChIP-seq studies of histone modifications in different cell lines. Additionally, peaksat can be applied to other sequence-based methods such as CUT&RUN and ATAC-seq.
Article
Green & Sustainable Science & Technology
I Haddeland, J. Hole, E. Holmqvist, V Koestler, M. Sidelnikova, C. A. Veie, M. Wold
Summary: Hydro power inflow, wind power, solar power, and electricity demand in Norway were estimated based on meteorological data. The study found that wind power production has a higher correlation with electricity demand compared to hydro inflow and solar power. Hydro power inflow showed a significant increasing trend, while wind and solar power production were less affected by climate differences. Electricity consumption decreased slightly over the 60-year period, resulting in a significant increasing trend in long-term estimated electricity surplus. Additional available electricity is needed to maintain supply security.
Article
Engineering, Electrical & Electronic
Fan Xia, Sixing Xu, Siwei Li, Xiaohong Wang
Summary: This research presents an improved on-chip micro supercapacitor with enhanced capacitance density, fast charge/discharge ability, and scalability, achieved through the use of mesoporous gold electrode framework and uniform MnO(2) active layer.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Pritam Bhattacharjee, Gaurav Trivedi, Alak Majumder
Summary: This article discusses the issue of on-chip power supply noise in IoT systems and proposes clock gating as a potential method to mitigate it. The research findings show that the LCT-CG implementation can significantly reduce power supply noise compared to other schemes and improve system lifetime. Additionally, the article reviews the industry standard for implementing CG schemes in integrated circuit chips.
INTERNATIONAL JOURNAL OF ELECTRONICS
(2022)
Article
Computer Science, Hardware & Architecture
Yaosheng Fu, Evgeny Bolotin, Niladrish Chatterjee, David Nellans, Stephen W. Keckler
Summary: This paper introduces a new COPA-GPU architecture to address the performance challenges of current GPUs in handling HPC and DL workloads. By utilizing modular design and memory system specialization, COPA-GPU can enable DL-specific products and provide higher performance.
ACM TRANSACTIONS ON ARCHITECTURE AND CODE OPTIMIZATION
(2022)
Article
Computer Science, Information Systems
Inn-Yeal Oh
Summary: This paper describes the implementation of an antenna-in-package (AiP) with a dual polarization function, supporting a three-dimensional (3D) beamforming operation. Different types of antennas were implemented to support reception in any direction. The antennas were designed in multiple array structures to enable beamforming operations. The experimental results show that the antennas perform well across the entire frequency band.
Article
Engineering, Electrical & Electronic
Haiwang Li, Kaiyun Zhu, Kaibo Lei, Tiantong Xu, Hanxiao Wu
Summary: This study presents a through-silicon via high-aspect-ratio toroidal transformer manufactured using microelectro-mechanical systems and electroplating. By wrapping a 1.2 mm high toroidal Ni-Zn ferrite core in silicon, a compact transformer with excellent performance in a high frequency range is achieved.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Food Science & Technology
Lixing Wang, Yulin He, Zhenning Wu
Summary: Tracing food products along the entire supply chain is crucial for better management. Traditional centralized traceability systems face challenges due to different complex systems used by supply chain users. This study presents a decentralized traceability system framework based on blockchain and RFID technology, providing decentralized data management and security guarantee. The system embeds blockchain technology into RFID tags, simplifying product tracking and enabling scalability for industrial use.
Article
Biotechnology & Applied Microbiology
Guan-Dong Shang, Zhou-Geng Xu, Mu-Chun Wan, Fu-Xiang Wang, Jia-Wei Wang
Summary: In this study, we introduce FindIT2, a software package that can process and analyze multi-omics data to infer influential transcription factors using ChIP-seq/ATAC-seq datasets. The package annotates ChIP-seq/ATAC-seq peaks, identifies transcription factor targets by combining ChIP-seq and RNA-seq data, and supports inference of influential transcription factors based on different types of data input. Moreover, FindIT2 is compatible with any species with genomic annotations, making it particularly useful for less well-studied non-model species.
Article
Multidisciplinary Sciences
Zhenyu Zhuo, Ershun Du, Ning Zhang, Chris P. Nielsen, Xi Lu, Jinyu Xiao, Jiawei Wu, Chongqing Kang
Summary: The Chinese government has set goals for carbon neutrality and renewable energy development in the power sector. However, due to the intermittency and increased investment costs of renewable energy, electricity costs will increase. According to the study, a significant amount of wind and solar photovoltaic capacity will be needed by 2050 to achieve carbon neutrality in China's power system, resulting in increased electricity supply costs.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Hasan Ahmadian Baghbaderani, Ansar Masood, Zoran Pavlovic, Kenny L. Alvarez, Cian OMathuna, Paul McCloskey, Plamen Stamenov
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2020)
Article
Physics, Applied
D. Jordan, G. Wei, A. Masood, C. O'Mathuna, P. McCloskey
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Darragh Cronin, M. Hardiman, D. Lordan, G. Wei, P. McCloskey, C. O'Mathuna, A. Masood
Summary: This study focuses on the influence of residual stress on in-plane uniaxial magnetic anisotropy in amorphous films, showing that tensile stress undermines soft magnetic performance. It is suggested that sources of tensile stress should be avoided during the fabrication or post-processing of amorphous films to retain magnetic softness.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ansar Masood, H. A. Baghbaderani, K. L. Alvarez, J. M. Blanco, Z. Pavlovic, V. Strom, P. Stamenov, C. O. Mathuna, P. McCloskey
Summary: This study investigates the high-frequency power loss performance and loss mechanisms in ultra-thin amorphous alloys. Ultra-high performance of ultrathin Co-rich amorphous ribbons is attributed to significantly low eddy current loss and minimal excess loss. The underlying loss mechanisms are analyzed decomposing material loss into primary components and identifying the magnetization reversal mechanisms.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Multidisciplinary Sciences
Daniel Lordan, Guannan Wei, Paul McCloskey, Cian O'Mathuna, Ansar Masood
Summary: This study focused on uncovering the origin of PMA in amorphous thin films deposited by magnetron sputtering, revealing that the change in the nature of anisotropy is related to the growth mechanism of the films and can be avoided by carefully selecting a deposition pressure regime. The emergence of PMA in amorphous thin films was found to be associated with the columnar growth of the films, which was previously not reported as a governing mechanism of perpendicular magnetisation.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Declan Jordan, Guannan Wei, Liang Ye, Daniel Lordan, Pranay Podder, Ansar Masood, Kenneth Rodgers, Cian O. Mathuna, Paul McCloskey
Summary: This article explores a novel method of integrating multilayer thin film magnetics in PCBs for Power Supply in a Package (PwrSip) applications. The solenoid inductor structure uses a multilayer CZTB magnetic sheet and achieves low R-dc values. Furthermore, the fabricated flip-chip inductor demonstrates a peak quality factor of 23 at 40 MHz.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Daniel C. Smallwood, Paul McCloskey, Cian O'Mathuna, Declan P. Casey, James F. Rohan
Summary: This paper introduces a new photolithography technique that utilizes photochemical reactions and diffraction effects to determine VIA latent images, suitable for broad-spectrum exposure systems without the need for complex in situ measurements. Through comparative studies, it has been shown that this technique displays a high correlation between simulated geometries and experimental data.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Chemistry, Physical
Hasan Ahmadian Baghbaderani, Ansar Masood, Kenny L. Alvarez, Cian O. Mathuna, Paul McCloskey, Plamen Stamenov
Summary: By utilizing the CALPHAD method and topological instability parameters, the optimization of CoFeB alloys through in-situ nanocrystallization was achieved, leading to outstanding magnetic properties. The controlled local atomic ordering of nanocrystalline phases and element distribution differences were instrumental in enhancing the alloy performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Jaime Lopez Lopez, Pablo Zumel, Seamus O'Driscoll, Zoran Pavlovic, Ruaidhri Murphy, Cian O'Mathuna, Cristina Fernandez
Summary: This article presents a comprehensive design procedure for cored micro-inductors, allowing for the optimal device to be designed in a single iteration. It also helps designers easily determine the limits of the inductor in terms of handled current and losses, providing valuable physical insights into the process output.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Chandra Shetty, Youssef Kandeel, Liang Ye, Seamus O'Driscoll, Paul McCloskey, Maeve Duffy, Cian O. Mathuna
Summary: This work presents analytical expressions for the dc inductance of 3-D air-core inductors with different cross-sectional pillars and discusses the effects of high frequency on inductance. The proposed analytical models show good agreement with numerical analysis and measurement results, providing accurate predictions for various inductor structures.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Chemistry, Physical
Hasan Ahmadian Baghbaderani, Ansar Masood, Kenny L. Alvarez, Daniel Lordan, M. Venkatesan, Cian O. Mathuna, Paul McCloskey, Plamen Stamenov
Summary: In this study, the amorphisation capability of Co-Fe-B alloys fabricated by melt spinning is predicted and evaluated using liquidus temperature, mixing enthalpy, and atomic mismatch factor. The study successfully predicts five amorphous alloy compositions and finds a strong correlation between amorphisation ability and crystallisation behaviour.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Youssef Kandeel, Seamus O'Driscoll, Cian O. Mathuna, Maeve Duffy
Summary: This article presents a new design procedure for fourth order and fourth-order resonance (4thRes) output filters, making component selection a straightforward process for given buck converter specifications. Accurate filter analysis is provided to predict the filter component currents and voltages in both frequency and time domains. Application of the analysis in a design study of a 20 MHz, 5.4 W buck converter shows that the 4thRes filter has the potential to reduce the output passive components for a wide duty cycle range. As compared with a second-order filter at V-IN = 6.6 V to V-OUT = 1.8 V, total inductance, inductor energy, capacitance, and capacitor energy are 58%, 35%, 45%, and 31% lower, respectively. Air-core printed circuit board (PCB) integrated solenoid inductors are considered for implementation and testing within a prototype converter to show the impact of these filters on the converter performance. The 4thRes filter achieved 3.7% and 3.6% higher full-load efficiency than the second- and fourth-order filters, respectively, and a better load transient performance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Youssef Kandeel, Seamus O'Driscoll, Cian O'Mathuna, Maeve Duffy
Summary: This article analyzes low-power, multiphase interleaved buck converters and investigates the benefits of adding more phases for reducing component sizes. It focuses on a typical converter application with a wide operating duty cycle range and a need for good load transient. The study demonstrates that increasing phase numbers is limited in its theoretical reduction of total inductor peak energy due to the restriction of phase current ripple. Additionally, the article evaluates the advantages of inductor coupling and provides guidelines for selecting coupling factors to avoid inductance roll-off. It showcases the implementation of different inductor types in single- and two-phase buck converter prototypes, highlighting size reduction and lower losses in the two-phase designs.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Proceedings Paper
Energy & Fuels
Cian O. Mathuna, Seamus O'Driscoll
Summary: This talk will discuss the performance opportunities and technology challenges of heterogeneous integration of power converters into processor packages through methods like PCB embedding, 2.5D or even 3D packaging. The emergence of magnetics-on-silicon technology and PCB-embedded magnetics technologies, along with integrated high density capacitor technologies, PMICs and power switches, are central to the development of integrated power solutions for multi-core microprocessors and other complex SOC platforms.
2022 24TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'22 ECCE EUROPE)
(2022)
Proceedings Paper
Energy & Fuels
Ruaidhri Murphy, Paul McCloskey, Zhibo Cao, Cian O. Mathuna, Seamus O'Driscoll
Summary: This paper discusses the integration of high-frequency inductor devices into PCBs to achieve higher density integration of power converters, using commercially available thin flexible planar magnetic materials to manufacture toroidal inductors, and comparing magnetic material properties across frequencies through electrical performance testing.
2021 THIRTY-SIXTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2021)
(2021)
