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Cross-paradigm data alignment to improve the calibration of asynchronous BCI systems in EEG-based speech imagery

Cross-paradigm data alignment to improve the calibration of ...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Mingtao Li Sio Hang Pun Fei Chen State Key Laboratory of Analog and Mixed Signal VLSI University of Macau Macau China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen China

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

The brain-computer interfaces (BCIs) based on speech imagery with asynchronous (self-paced) paradigms enable users to directly access and manipulate BCIs with more freedom. Compared with the indirect BCIs with traditional synchronous (cue-based) paradigms, the calibration time of asynchronous paradigms was much longer and with the unbalanced number of task states and idle states. This work aimed to improve the calibration of asynchronous BCI systems by applying a data alignment (DA) approach on cue-based and self-paced paradigms. The cue-based paradigm was regarded as the calibration paradigm and the self-paced paradigm was the testing paradigm. The data alignment approach based on the parallel transport mapped their features on the same tangent space. The logistic regression was used as the classifier to classify task states and idle states. The average result with DA was 7.52% higher than that without DA (baseline), which were 78.45% and 70.92%, respectively. Specially, the best classification accuracy was for 91.82% with DA, and the largest improvement in accuracy was 22.92%. These results suggest that it is practical to use a synchronous paradigm as calibration paradigm in asynchronous BCI systems and the data alignment approach has positive impacts on the classification of task states and idle states.

关键词： Logistic regression Accuracy Electroencephalography Brain-computer interfaces Calibration Engineering in medicine and biology Testing

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A LDO with 5-nA Quiescent Current and Improved Transient Response within a 50-mA Load Current Range

A LDO with 5-nA Quiescent Current and Improved Transient Res...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Zaitian Yang Qiujin Chen Shaowei Zhen Mo Huang State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macao China School of Integrated Circuit Science and Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (数字)9798350330991

ISBN: (纸本)9798350331004

A Low-Dropout Regulator (LDO) with low quiescent current is proposed. The LDO uses a variable capacitance tracking zero compensation to enhance the stability within a wide load current range. Furthermore, it utilizes adaptive biasing current for a low quiescent current at the steady-state, while a transient enhancement circuit to improve transient response. Designed with a 65-nm CMOS process, the proposed LDO consumes a 5-nA quiescent current and supports a maximum 50-mA load current. The simulated output undershoot is 137 mV when the LDO has a load current step from 0 to 50 mA, with a 0.4-ns edge time.

关键词： Transient response Regulators Circuits and systems Capacitance CMOS process Stability analysis Circuit stability

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High Speed Photonic Time-Stretched ADC based on Dispersion-Tunable CFBG 20

High Speed Photonic Time-Stretched ADC based on Dispersion-T...

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20th International Conference on Optical Communications and Networks, ICOCN 2022

作者： Li, Shangru Xiao, Dongrui Liu, Shuaiqi Yu, Feihong Xu, Weijie Hu, Jie Sun, Siming Shao, Liyang Zhang, Qingfeng Southern University of Science and Technology Department of Electrical and Electronic Engineering Shenzhen518055 China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau 999078 China Peng Cheng Laboratory Shenzhen518005 China

A single-channel PTS-ADC based on dispersion-Tunable CFBG is proposed to realize tunable sampling rate. Seven different sampling rates corresponding to different stretching factors are obtained. The total sampling rat... 详细信息

ISBN: (数字)9781665458986

ISBN: (纸本)9781665458986

关键词： Fiber Bragg gratings

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A Novel Multiple Modes Resonant Sensor Featuring Blue Sideband Excitation 38

A Novel Multiple Modes Resonant Sensor Featuring Blue Sideba...

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38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Xu, Jiao Zheng, Zhuoyue Xi, Jingqian Zhang, Ziqian Liu, Huafeng Zhang, Pan Chen, Jianlin Wang, Chen Kraft, Michael Wang, Yuan Martins, R.P. Mak, Pui-In Huazhong University of Science and Technology Moe Key Laboratory of Fundamental Physical Quantities Measurement Pgmf School of Physics Wuhan430074 China University of Macau Institute of Microelectronics State Key Laboratory of Analog and Mixed-Signal Vlsi 999078 China Peking University National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated Circuits 100871 China Shanghai University School of Microelectronics 200444 China Ku Leuven Department of Electrical Engineering-MNS Leuven3000 Belgium

ISBN: (纸本)9798331508890

This paper reports a novel MEMS resonant structure functioning as a baseline resonant electrostatic force/temperature sensor, highlighting its substantial potential in sensing applications. The resonator, characterized by a dual-cosine structure, is capable of simultaneous multiple resonant modes actuation within the 300 kHz range, through a sole-source drive approach using the recent emerging Blue Sideband Excitation (BSE) technique. This method enables a distinctive multi-modal response, essential for multi-parameter measurements. The research focuses on the sensor's temperature characteristics, electrostatic perturbation sensitivity, and noise floor. Notably, the study reveals intriguing temperature responses across different modes, where certain modes exhibit a significant frequency rise with increasing temperature, this is counter-intuitive with common MEMS resonator devices, prompting further investigation into the underlying mechanisms. The analysis of electrostatic perturbation sensitivity and noise background further unfolds the resonator's performance under various excitation conditions, laying a foundation for advancing sensor functionality, and providing solid evidence on the viability of the subject. To sum up, this study highlights the resonator's potential as a high-precision sensor, opening new opportunities for MEMS sensor design and multi-parameter measurement applications. © 2025 IEEE.

关键词： Microchannels

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When Time Interleaving Encounters Oversampling in ADC

When Time Interleaving Encounters Oversampling in ADC

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International Conference on Solid-state and Integrated Circuit technology

作者： Mingqiang Guo Dongyang Jiang Shulin Zhao Sai-Weng Sin Rui P. Martins Institute of Microelectronics and Department of ECE State-Key Laboratory of Analog and Mixed-Signal VLSI Faculty of Science and Technology University of Macau Macao China Instituto Superior Técnico Universidade de Lisboa Portugal

ISBN: (数字)9798350361834

ISBN: (纸本)9798350361841

Time-interleaved ADC architecture is widely used in high-speed applications because this structure can increase the speed of ADC linearly by adding the number of channels. On the other hand, the oversampling technique, especially the technique that combines oversampling and noise shaping, can significantly improve the accuracy of the ADC through a trade-off between speed and resolution. So, what kind of sparks will be produced when time interleaving meets oversampling? This paper will be based on the three works of our research group in recent years, combined with other excellent papers, and try to discuss how to combine the time-interleaved and oversampling to solve the mismatch between the channels of the time-interleaved ADC and break the speed bottleneck through the traditional sigma-delta modulators or noise-shaping SAR ADC.

关键词： Integrated circuit technology Hands Sigma-delta modulation Accuracy Reviews Modulation Noise shaping Sparks

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A 12.87-dB Gain 10.5-dBm OPldB60-to-66-GHz LNA in 0.15-μm GaAs pHEMT technology

A 12.87-dB Gain 10.5-dBm OPldB60-to-66-GHz LNA in 0.15-μm G...

引用

2022 IEEE the Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics, PrimeAsia 2022

作者： Li, Xuefeng Wang, Yuting Wu, Tianxiang Chen, Yong Ren, Junyan Ma, Shunli School of Microelectronics Fudan University State Key Laboratory of ASIC and System Shanghai China State Key Laboratory of ASIC and System School of Information Science and Technology Fudan University Shanghai China University of Macau State-Key Laboratory of Analog and Mixed-Signal VLSI and IME/ECE-FST Macao China

ISBN: (纸本)9781665450690

This paper presents a V-band low noise amplifier (LNA) implemented in a 0.15-μm Gallium Arsenide (GaAs) pseudomorphic high electron-mobility transistor (pHEMT) technology. The LNA adopts a three-stage common-source (CS) topology. Each transistor has a bias circuit, and the microstrip-line inductor is used to realize the input noise matching network, the interstage, and the output matching network. Circuit simulations show that our LNA scores a 12.87-dB small-signal gain, the 3-dB bandwidth ranges from 60 GHz to 66 GHz, and the current consumption is 30 mA under a 5-V supply voltage. Its noise figure is 5.9 dB, and the output 1-dB compression point is 10.5 dBm. The chip area is 1.32× 1.5mm2. © 2022 IEEE.

关键词： Low noise amplifiers

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Window-Based Quaternion Principal Component Analysis of Eye Gaze Dynamics for Depression Severity Prediction

Window-Based Quaternion Principal Component Analysis of Eye ...

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2024 IEEE Region 10 Conference, TENCON 2024

作者： Hung, Kevin Man, Gary Man-Tat Chui, John Kwok-Tai Chow, Daniel Hung-Kay Ling, Bingo Wing-Kuen Pun, Sio-Hang Liu, Tai-Wa The School of Science and Technology Hong Kong Metropolitan University Hong Kong The Education University of Hong Kong The Department of Health and Physical Education Hong Kong The School of Information Engineering Guangdong University of Technology Guangdong Province China University of Macau The State key Laboratory of Analog and Mixed Signal Vlsi China The School of Nursing and Health Studies Hong Kong Metropolitan University Hong Kong

ISBN: (纸本)9798350350821

Depression is a global health issue that necessitates severity identification for effective treatment. Although early detection and monitoring of mental abnormalities are crucial for mitigating adverse conditions, standard diagnostic approaches for depression, including self-rating scales and clinician-based interviews, fall short of meeting these needs. Wearable sensors offer an opportunity for unobtrusive evaluation of patients' status throughout their daily life, but it presents challenges in feature extraction and depression severity prediction. Studies have shown that eye gaze dynamics in term of 3-D rotations are a good indicator of depression. However, their traditional representation in Euler angles is computationally inefficient and overlooks the channel-wise interrelations, thereby reducing their discriminative power in medical diagnosis. This paper proposes a novel approach to address these challenges. It uses a window-based quaternion principal component analysis algorithm to extract features of eye gaze dynamics, preserving the channel-wise interrelations and temporal information. The proposed algorithm was tested and validated using a benchmark depression dataset from previous studies. Results showed that the algorithm achieved higher accuracy in depression severity prediction with a root mean square error of 5.08, outperforming existing state-of-the-art prediction methods that only use visual data. The results were further analyzed and discussed, providing valuable insights into the effectiveness and potential applications of wearable sensor for mental health diagnostics. © 2024 IEEE.

关键词： Mean square error

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Nonlinear PID DC-link Voltage Control for Hybrid Power Filter Based on Robust Exact Differentiator with Improved Transient Response 48

Nonlinear PID DC-link Voltage Control for Hybrid Power Filte...

引用

48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022

作者： Gong, Cheng Sou, Wai-Kit Lam, Chi-Seng Komurcugil, Hasan State Key Laboratory of Analog and Mixed-Signal Vlsi University of Macau China University of Macau Institute of Microelectronics China University of Macau Faculty of Science and Technology Department of Electrical and Computer Engineering China Eastern Mediterranean University Department of Computer Engineering Famagusta Turkey

ISBN: (数字)9781665480253

ISBN: (纸本)9781665480253

LC-coupling hybrid active power filter (LC-HAPF) is a cost-effective solution to address power quality issues in low and medium voltage distribution networks. The DC-link voltage controller plays an important role of the LC-HAPF performance. Conventionally, proportional-integral (PI) controller is commonly used for DC-link voltage control due to the ideally zero steady-state error. However, the property of integrator slows down the transient response of DC-link voltage and thus effects the LC-HAPF dynamic performance. In this paper, a nonlinear PID (NPID) controller based on robust exact differentiator (RED) is proposed to improve the transient response of conventional PI controller. First, the parameters of the PID controller are designed by s-domain transfer function analysis. Then, the RED is proposed to replace the linear differentiator, which provides the differential signal fast and accurately. Finally, the advantages of the proposed NPID controller based on RED are verified by simulation results compared with the conventional PI controller. © 2022 IEEE.

关键词： Transient analysis

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A Wireless Charging System with Bipolar Partial Power Conversion for 400V/800V EV Battery

A Wireless Charging System with Bipolar Partial Power Conver...

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Annual Conference of Industrial Electronics Society

作者： Muxing Wu Io-Wa Iam Cheng Gong Chi-Seng Lam State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau China Institute of Microelectronics University of Macau Macau China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macau China

ISBN: (数字)9781665464543

ISBN: (纸本)9781665464550

Currently, electric vehicle (EV) battery platforms typically vary in standard, commonly rated at either 800V or 400V. Conventional wireless charging system (WCS) are limited to single voltage level charging, necessitating wireless communication or additional complex circuits for achieving multi-voltage level charging, which can compromise operational stability and overall efficiency. This article proposes a WCS based on the concept of bipolar partial power conversion. By incorporating reversing series switches on the secondary of the DC/DC converter, regulation voltage control enables switching between positive and negative polarity to supply power to either 800V or 400V battery for EV. This approach ensures high power transmission efficiency, without relying on wireless communication, thereby ensuring stable charging process. Furthermore, this article also presents various combinations of bipolar topologies that can be selectively employed based on application requirements. Finally, simulation results validate the feasibility of the proposed 3.2KW WCS.

关键词： Wireless communication Inductive charging Optical wavelength conversion Switches Regulation Batteries Topology Power conversion Voltage control Stress

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Neumann Series based Linear Bus Injection Model of Three-Phase AC Power Flow for Active Distribution Network

Neumann Series based Linear Bus Injection Model of Three-Pha...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Cheng Gong Chi-Seng Lam State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau China Institute of Microelectronics University of Macau Macau China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macau China

ISBN: (数字)9798350394085

ISBN: (纸本)9798350394092

Linearization of AC power flow is crucial for simplifying the analysis and optimization of power systems, enabling more efficient and scalable computation for network operation and control. In this paper, a Neumann series expansion based linear bus injection model (NS-BIM) of three-phase AC power flow of active distribution network (ADN) is proposed. First, the full-nonlinear three-phase BIM is built based on AC power flow equations. Then, the mathematical derivation of the proposed NS-BIM is provided. Moreover, the approximation error analysis is given which guarantee the robustness of the NS-BIM. Finally, numerical case studies on different benchmark ADN systems are carried out to verify the accuracy of the NS-BIM in comparing with other representative linear BIMs.

关键词： Analytical models Accuracy Computational modeling Benchmark testing Approximation error Mathematical models Robustness

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