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Electrical and Computer Engineering Faculty Research & Creative Works

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Mode-Decomposition-Based Equivalent Via (Mev) Model And Mev Model Application Range Analysis, Chaofeng Li, Kevin Cai, Muqi Ouyang, Manish Kizhakkeveettil Mathew, Mehdi Mousav, Bidyut Sen, Donghyun Kim Jan 2023

Mode-Decomposition-Based Equivalent Via (Mev) Model And Mev Model Application Range Analysis, Chaofeng Li, Kevin Cai, Muqi Ouyang, Manish Kizhakkeveettil Mathew, Mehdi Mousav, Bidyut Sen, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

The Mode-Decomposition-Based Equivalent Via (MEV) Model is Proposed in This Paper, which is a Physics-Based Equivalent Model for the High-Speed Channel Modeling. the Application Ranges of the MEV Model Are Analyzed by Varying Anti-Pad Radius, Via Radius, and Distance between the Parallel Plates for a Single Via with Multiple Layers. based on the S-Parameter Comparison with Full-Wave Simulations, the MEV Model is Useful for the Insertion Loss Calculation Up to 100 GHz. Meanwhile, the Return Loss from the MEV Model Shows a High Level of Correlation with Full-Wave Simulation Results Up to 70GHz, Even When the Anti-Pad Radius is Larger …

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Analysis And Modeling Framework Of Common Mode Noise In A Three-Phase Motor System, Manish K. Mathew, Xin Yan, Yuandong Guo, Tanner Fokkens, Li Shen, Daryl G. Beetner, Donghyun Kim Jan 2023

Analysis And Modeling Framework Of Common Mode Noise In A Three-Phase Motor System, Manish K. Mathew, Xin Yan, Yuandong Guo, Tanner Fokkens, Li Shen, Daryl G. Beetner, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic Interference (EMI) Issue is One of the Major Constraints of Power Electronic Converters, Especially for Variable-Speed Systems. in This Work, the Common Mode Noise in a Three-Phase Motor System is Analyzed and Modeled. the Three-Phase Pulse-Width Modulation (PWM) Inverter Creates High Magnitudes of Dv/dt and Di/dt, Resulting in Common Mode Noise and Disturbance Power. in This Paper, the Common Mode Noise and Disturbance Power Modeling Method Are Proposed for Three-Phase Motor Systems. the Proposed Equivalent Circuit Model Comprises Detailed Models for Insulated Gate Bipolar Transistors (IGBTs), EMI Filters, a Three-Phase Motor and a Printed Circuit Board (PCB). the Proposed …

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System Level Pdn Impedance Optimization Utilizing The Zeros Of The Decoupling Capacitors, Yifan Ding, Shuang Liang, Francesco De Paulis, Matteo Cocchini, Samuel Connor, Matthew Doyle, Albert E. Ruehli, Chulsoon Hwang, James L. Drewniak Jan 2023

System Level Pdn Impedance Optimization Utilizing The Zeros Of The Decoupling Capacitors, Yifan Ding, Shuang Liang, Francesco De Paulis, Matteo Cocchini, Samuel Connor, Matthew Doyle, Albert E. Ruehli, Chulsoon Hwang, James L. Drewniak

Electrical and Computer Engineering Faculty Research & Creative Works

System-Level Power Distribution Network (PDN) Impedance Optimization Utilizing the Zeros of the Decoupling Capacitors (Decaps) is Discussed in This Paper. an Example of a Practical PDN Application is Proposed to Validate the Poles and Zeros Algorithm (P&Z) Presented. the System-Level PDN is with the Printed Circuit Board (PCB), Package (PKG), and Chip, as Well as the Low-Frequency Decaps on the PCB and the On-PKG Decoupling Capacitors. the PDN Optimization Results Are Compared with Those from the Genetic Algorithm (GA) to Show the Reasonableness and Validity of the P&Z Algorithm.

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Analysis On The Effect Of Averaging Duration On Radio Frequency Dosimetry In Residential Environments, Reza Asadi, Hadi Aliakbarian, Amir Sahraei, Reza Yazdani, Donghyun Kim Jan 2023

Analysis On The Effect Of Averaging Duration On Radio Frequency Dosimetry In Residential Environments, Reza Asadi, Hadi Aliakbarian, Amir Sahraei, Reza Yazdani, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

The Potential Hazards of Electromagnetic Waves Have Raised Concerns in Related Authorities to Propose Standards and Limit Lines on the Electromagnetic Field Levels. Most of the Radio Frequency (RF) Dosimetry Measurement Procedures Referred to in Safety Compliance Standards, suggest 6-Minute Averaging, in Addition to Spatial Averaging, Which Can Be Time-Consuming for Primary Measurements. Measurement Analysis in Residential Environment in This Paper Demonstrates that Lowering the Time Interval of Measurements to About 30 Seconds, Which Suggests the Possibility of Reducing the Measurement Time with Minimal Reduction to Measurement Accuracy. for All Measurement Results Shown in This Paper, having a 30-Second Averaging …

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Continual Learning-Based Optimal Output Tracking Of Nonlinear Discrete-Time Systems With Constraints: Application To Safe Cargo Transfer, Behzad Farzanegan, S. (Sarangapani) Jagannathan Jan 2023

Continual Learning-Based Optimal Output Tracking Of Nonlinear Discrete-Time Systems With Constraints: Application To Safe Cargo Transfer, Behzad Farzanegan, S. (Sarangapani) Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Addresses a Novel Lifelong Learning (LL)-Based Optimal Output Tracking Control of Uncertain Non-Linear Affine Discrete-Time Systems (DT) with State Constraints. First, to Deal with Optimal Tracking and Reduce the Steady State Error, a Novel Augmented System, Including Tracking Error and its Integral Value and Desired Trajectory, is Proposed. to Guarantee Safety, an Asymmetric Barrier Function (BF) is Incorporated into the Utility Function to Keep the Tracking Error in a Safe Region. Then, an Adaptive Neural Network (NN) Observer is Employed to Estimate the State Vector and the Control Input Matrix of the Uncertain Nonlinear System. Next, an NN-Based …

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Analysis On Extraction Of Potential Radiated Emission Limit Line For Data Center Equipment From 10 Ghz To 40 Ghz, Zhekun Peng, Wei Zhang, Jong Hwa Kwon, Donghyun Kim Jan 2023

Analysis On Extraction Of Potential Radiated Emission Limit Line For Data Center Equipment From 10 Ghz To 40 Ghz, Zhekun Peng, Wei Zhang, Jong Hwa Kwon, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

The Radiated Emission (RE) Potential Limit Line for Router System is Analyzed from 10 GHz to 40 GHz based on CISPR TR 16-4-4 Standard. Statistical Data is Collected for the Limit Line Extraction from Measurement, Numerical Analysis, 3D Full-Wave Simulation and Literature Studies. All the Factors Considered in Limit Line Calculation Are Analyzed for Data Center Equipment Operation. the Result of Extracted Potential Limit Line Shows the Rising Limit Line between 10 GHz and 40 GHz Frequency Band for Potential Future Radiated Emission Limit Line above 40 GHz Targeted for High-Speed Equipment Radiated Emission. This Paper is Not a Standard …

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Challenges And Solutions For Automotive Ota Testing, Jiyu Wu, Yihong Qi, Penghui Shen, Wei Yu, Lie Liu, James L. Drewniak Jan 2023

Challenges And Solutions For Automotive Ota Testing, Jiyu Wu, Yihong Qi, Penghui Shen, Wei Yu, Lie Liu, James L. Drewniak

Electrical and Computer Engineering Faculty Research & Creative Works

OTA (Over-The-Air) Testing is Essential for Developing Assisted and Autonomous Driving Systems in Vehicles, as It Plays a Crucial Role in the Localization, Perception, and Intelligent Driving Capabilities of ICVs (Intelligent Connected Vehicles). Automotive Antennas, Typically Much Smaller in Size Than the Vehicle itself and Can Be Located in Various Positions, Require Spherical Near-Field Measurement for OTA Testing. While There Are Established Standards for OTA Testing Methods and Uncertainties for Mobile Devices, Base Stations, and Satellite Components, There Are Still Many Challenges in the OTA Testing of Automotive Systems. These Challenges, specifically in SISO (Single Input Single Output) and MIMO …

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On The Permittivity Of Xt-Cf20, Aaron Harmon, Wei Zhang, Victor Khilkevich Jan 2023

On The Permittivity Of Xt-Cf20, Aaron Harmon, Wei Zhang, Victor Khilkevich

Electrical and Computer Engineering Faculty Research & Creative Works

In This Work, the Permittivity of a 3D-Printed Carbon Fiber-Loaded Anisotropic Material, XT-CF20, is Examined Further. the Microstructure of XT-CF20 is First Examined Via Optical Imaging and is Shown to Be Composed of Inclusions that Are Aligned with the Print Direction of the Sample. the Permittivity Tensor for the Aligned Microstructure is Then Measured using a Capacitive Measurement Technique and Simulations Are Provided to Demonstrate the Validity of This Measurement Method. the Simulated Permittivity Values for XT-CF20 Samples with Varying Infill Structures Are Then Presented and Compared to the Measured Permittivity Values of Said Samples. an Error of Less Than …

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An Analysis On The Effectiveness Of 2 And 3 Terminal Capacitors In Pdn Design, Jack Juang, Jiahuan Huang, Anfeng Huang, Kelvin Qiu, Hanfeng Wang, Yansheng Wang, Zhiping Yang, Chulsoon Hwang Jan 2023

An Analysis On The Effectiveness Of 2 And 3 Terminal Capacitors In Pdn Design, Jack Juang, Jiahuan Huang, Anfeng Huang, Kelvin Qiu, Hanfeng Wang, Yansheng Wang, Zhiping Yang, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

The Parasitic Inductance of a Capacitor Depends on its Physical Structure. Due to the Geometry of 3-Terminal Capacitors, They Boast a Lower Parasitic Inductance Compared to 2-Terminal Capacitors of the Same and Possibly Smaller Package Sizes. While the Parasitic Inductance of a Single 3-Terminal Capacitor May Be Lower, using Multiple 2-Terminal Capacitors May Result in Similar Performance. in This Work, the Inductance of 2-Terminal (0201, Nominal 2.2 UF) and 3-Terminal (0402, Nominal 4.3 UF) Capacitors is Extracted and Compared through Measurements. from Our De-Embedding Method and Characterized Capacitors, the Inductance of 2-Terminal Capacitors is Only About 20 PH Higher Than …

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Roughness Losses Computation Through The Partial Elements Equivalent Circuit Method, Fabrizio Loreto, Daniele Romano, Giulio Antonini, Albert E. Ruehli, Mauro Lai Jan 2023

Roughness Losses Computation Through The Partial Elements Equivalent Circuit Method, Fabrizio Loreto, Daniele Romano, Giulio Antonini, Albert E. Ruehli, Mauro Lai

Electrical and Computer Engineering Faculty Research & Creative Works

Conductor Loss Caused by Conductor Surface Roughness is a Critical Aspect in the Design of High-Speed Electronic Systems Since It Significantly Affects their Performances. Well-Established Roughness Models Have Been Proposed over the Years but They Have Been Applied Only to the Transmission Line Models of Interconnects. Typically, the Roughness Models Are Used to Modify the Per-Unit-Length Impedance of the Transmission Line Which is Extracted by 2D Model Methods. The Aim of This Work is to overcome This Limitation Thus Making It Possible to Model Roughness Conductors in the Framework of 3D Full-Wave Methods. More Precisely, it is Presented How to …

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Analysis Of Electromagnetic Interference Problems Caused By Split Reference Plane On High-Speed Multilayer Boards, Xin Fang, Chulsoon Hwang, Michelle Liu, Rodrigo Rodriguez Navarrete Jan 2023

Analysis Of Electromagnetic Interference Problems Caused By Split Reference Plane On High-Speed Multilayer Boards, Xin Fang, Chulsoon Hwang, Michelle Liu, Rodrigo Rodriguez Navarrete

Electrical and Computer Engineering Faculty Research & Creative Works

Digital/Analog Ground Partitioning Has Been Used to Isolate Noisy Digital and Power Current from Sensitive Analog Currents in High-Speed Multiplayer Printed Circuit Boards. This Design, However, Breaks the Current Return Path for Signal Traces that Cross the Two Separated Grounds, Which Causes Undesired Effects Such as Signal Distortion and Radiated Emission. Electromagnetic Mechanism Associated with Them Needs to Be Understood to Control and Suppress These Undesired Effects. in This Paper, Equivalent Circuit Diagrams Are Presented to Explain the Current Path in a Practical Camera Device with the Separated Ground. Finally, Optimal Stitching Via Locations is Determined to Provide a Good …

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A Thermal-Aware Dc-Ir Drop Analysis For 2.5d Ic, Shengxuan Xia, Baris M. Dogruoz, Yansheng Wang, Songping Wu, Siqi Bai, Chulsoon Hwang, Zhonghua Wu Jan 2023

A Thermal-Aware Dc-Ir Drop Analysis For 2.5d Ic, Shengxuan Xia, Baris M. Dogruoz, Yansheng Wang, Songping Wu, Siqi Bai, Chulsoon Hwang, Zhonghua Wu

Electrical and Computer Engineering Faculty Research & Creative Works

With the Trend of Higher Integration, 3D/2.5D IC Solutions Such as CoWoS (Chip-On-Wafer-On-Substrate) Have Become More Popular in Recent Years. Power Integrity (PI) is Always a Critical Part of the Design Especially When the Power Consumption Requirements Are Important Specs for High-Performance Computing. DC-IR Drop is One of the Criteria within Power Integrity Considerations. However, Ordinary Electrical-Only Simulation for DC-IR Drop Will Be an Underestimation Because It Neglects the Copper Conductivity Dropping Due to the Temperature Rising. Thus, an Engineering Solution for Electrical-Thermal Co-Simulation is Important to Help to Provide Both an Accurate PI Analysis and the Proper Mitigations of …

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Extraction For Multilayer Ceramic Capacitor Vibration Induced Force, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Xin Hua, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang Jan 2023

Extraction For Multilayer Ceramic Capacitor Vibration Induced Force, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Xin Hua, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

Due to the Piezoelectric Characteristic of the MLCC Dielectric BaTiO3, the Multilayer Ceramic Capacitor (MLCC) Can Vibrate When the Supply Voltage Has AC Components. the Vibration of the MLCC Will Generate a Force on the Printed Circuit Board (PCB) It is Connected To, Causing the PCB to Vibrate as Well. the MLCC Vibration-Generated Force is Extracted using a Measurement-Simulation-Based Methodology in This Paper. the Force of an MLCC is First Extracted at the PCB Resonance Frequencies. Then, a Broadband Force Profile is Obtained by using the Interpolating Method. the Extraction Methodology Can Be Used in Different Boundary Conditions, on Different …

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Reconfigurable Intelligent Surface (Ris) Design For 5g N260 Frequency Band, Reza Yazdani, Manish Kizhakkeveettil Mathew, Zhekun Peng, Donghyun Kim Jan 2023

Reconfigurable Intelligent Surface (Ris) Design For 5g N260 Frequency Band, Reza Yazdani, Manish Kizhakkeveettil Mathew, Zhekun Peng, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

In This Paper, a New Low Profile Reconfigurable Intelligent Surface Design with High Resolution Steering Reflector and Wide Frequency Band Width is Proposed at N260 Frequency Band, Used for 5G New Radio Applications. the Dynamic Reflection Phase and Tunability is Realized by Integrating of Varactor Diode with Each Unit Cell. This Study Presents Design Procedures, Reflection Simulation Verifications, and the Effects of Important Parameters on the Performance of the Proposed Novel Resonant Unit Cell. the Proposed Unit Cell Offers a Dynamic Reflection Phase Range of More Than 270° at a Wide Frequency Bandwidth. Simulation Results of Beam Steering Capability in …

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Near Field Scanning-Based Emi Radiation Root Cause Analysis In An Ssd, Xiangrui Su, Wenchang Huang, Junghee Cho, Joonki Paek, Chulsoon Hwang Jan 2023

Near Field Scanning-Based Emi Radiation Root Cause Analysis In An Ssd, Xiangrui Su, Wenchang Huang, Junghee Cho, Joonki Paek, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

In Modern Portable Electronic Devices, Solid-State Drives (SSDs) Are Commonly Used and Have Been Identified as One of the Dominant Electromagnetic Interference (EMI) Noise Sources that Can Cause RF Desensitization Issues. in This Paper, the EM Emission Source from an SSD Module is Identified and Analyzed using Near Field Scanning and Dipole Moment Source Reconstruction. the Identified Noise Current Path Including the Power Management Integrated Circuit and the Decoupling Capacitor is Validated with the Assistance of Full-Wave Simulation. the Measured Noise Voltage is Used as an Excitation in the Simulation and the Simulated Near Fields Showed a Good Correlation with …

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Esd Behavior Of Rf Switches And Importance Of System Efficient Esd Design, Seyed Mostafa Mousavi, Emil Tauber, Amin Pak, David Pommerenke, Daryl G. Beetner, Ketan Shringarpure, Benjamin Lee, Warwick Ka Kui Wong Jan 2023

Esd Behavior Of Rf Switches And Importance Of System Efficient Esd Design, Seyed Mostafa Mousavi, Emil Tauber, Amin Pak, David Pommerenke, Daryl G. Beetner, Ketan Shringarpure, Benjamin Lee, Warwick Ka Kui Wong

Electrical and Computer Engineering Faculty Research & Creative Works

RF Switches Are Typically Used in the RF Front-End of Portable Devices Such as Antenna or Matching Tuners to Improve the RF Link Performance. They Are Usually the First Active Devices after the Antenna and Are Vulnerable to Primary or Secondary ESD Discharges to the Antennas. This Paper Investigates the ESD Behavior of One of the High Frequency Switches Used in the RF-Front-End of Portable Devices and Expresses the Importance of the ESD Pulse that Passes through the Switch and Reaches the Next Stage in the RF Path, Possibly Damaging the Next Stage.

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Design And Construction Of An Arbitrary Pulse Compressive Amplifier, Cody Goins, Aaron Harmon, Victor Khilkevich, Daryl G. Beetner Jan 2023

Design And Construction Of An Arbitrary Pulse Compressive Amplifier, Cody Goins, Aaron Harmon, Victor Khilkevich, Daryl G. Beetner

Electrical and Computer Engineering Faculty Research & Creative Works

Compressive Pulse Amplifiers Are a Class of Amplifiers that Convert Long Low Amplitude Signals into Very Broadband Pulses of High Amplitude, Yielding a Very High Instantaneous Peak Power Output Pulse. However, in the Realm of Electronic Immunity and Susceptibility Testing, Very Broadband Short Pulses Are Not Always Desired. This Work Presents a Design for a Compressive Amplifier that is Aimed at Creating Arbitrary Pulsed Signals of Varying Bandwidths. Limitations of the Achievable Gain and Methods Used Are Discussed.

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A Real-Time Microwave Camera Prototype With Zero-Bias Diode Detectors For Emi Source Imaging, Xin Yan, Liang Liu, Victor Khilkevich Jan 2023

A Real-Time Microwave Camera Prototype With Zero-Bias Diode Detectors For Emi Source Imaging, Xin Yan, Liang Liu, Victor Khilkevich

Electrical and Computer Engineering Faculty Research & Creative Works

Emission Source Microscopy (ESM) Could Be Utilized to Localize the Electromagnetic Interference (EMI) Sources that Contribute to the Far-Field Radiation. in Those Cases, the Electrical Field over a Two-Dimensional Plane is Collected by Mechanical Scanning, Resulting in a Long Measurement Time and the Presence of Mechanical Errors. in This Work, a Microwave Camera based on a Two-Dimensional Array of Elliptical Slot Antennas and Diode Detectors is Presented. Multiplexers Are Utilized to Access the Output of Each Detector and the Scanning of the Whole Array Could Be Done Multiple Times Per Second.

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Coupling Path Analysis For Smart Speaker Intentional Electromagnetic Interference Attacks, Tanner Fokkens, Shengxuan Xia, Aaron Harmon, Chulsoon Hwang Jan 2023

Coupling Path Analysis For Smart Speaker Intentional Electromagnetic Interference Attacks, Tanner Fokkens, Shengxuan Xia, Aaron Harmon, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Shows an Improved Understanding of the Coupling Path for Intentional Electromagnetic Interference (IEMI) Attacks on Smart Speaker Devices. This Includes a Method for Finding the Ideal Attack Angle and Locating the Region Sensitive to the Coupled EMI. in Previous Works, It Was Shown to Be Possible to Send RF Commands to a Smart Speaker and Have These Commands Be Interpreted as Voice Commands by the Microphone. However, the Attack Still Had Some Limited Understanding in Terms of the Coupling Path Location and Long-Distance Attack Potential. using the Improved Understanding of the Attack, a Longer Attack Distance is Achieved …

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On Finding An Equivalent Force To Mimic The Multilayer Ceramic Capacitor Vibration, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Shengyin Ding, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang Jan 2023

On Finding An Equivalent Force To Mimic The Multilayer Ceramic Capacitor Vibration, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Shengyin Ding, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

The Multilayer Ceramic Capacitor (MLCC) Can Vibrate Due to the Piezoelectric Effect When There is AC Noise on the Power Rail. the Vibration of the Capacitor Will Generate a Force on the PCB and Thus Cause the PCB Vibration and Audible Problems May Occur. the Work in This Paper Finds an Equivalent Force with Similar Behavior to the MLCC-Generated Force. the Force is Controllable and Knowable and Thus Can Mimic the Capacitor Vibration on the PCB.

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Undesired-Resonance Analysis And Modeling Of Differential Signals Due To Narrow Ground Lines Without Stitching Vias, Chaofeng Li, Yuandong Guo, Yuanzhuo Liu, Siqi Bai, Bichen Chen, Srinivas Venkataraman, Xu Wang, Donghyun Kim Jan 2023

Undesired-Resonance Analysis And Modeling Of Differential Signals Due To Narrow Ground Lines Without Stitching Vias, Chaofeng Li, Yuandong Guo, Yuanzhuo Liu, Siqi Bai, Bichen Chen, Srinivas Venkataraman, Xu Wang, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Undesired Resonances on High-Speed Differential Signals Are Studied in This Paper, which is Caused by the Adjacent Narrow Ground Line Without Stitching Vias. Due to Space Limitations in the High-Speed Channel Layouts of Certain Package Applications, the Ground (GND) Line is Often Narrow and Has Insufficient Stitching Vias, Potentially Causing Undesired Resonance in High-Speed Differential Signals. in This Study, These Undesired Resonances Were Investigated using 3D Simulations, revealing that They Can Be Modeled as Parallel-Coupled Half-Wavelength Resonance. the Resonance Frequency of the Parallel-Coupled Half-Wavelength Resonance Structure Can Be Predicted Well using the Formula based on the GND Line Length. Moreover, …

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Lifelong Learning Control Of Nonlinear Systems With Constraints Using Multilayer Neural Networks With Application To Mobile Robot Tracking, Irfan Ganie, S. (Sarangapani) Jagannathan Jan 2023

Lifelong Learning Control Of Nonlinear Systems With Constraints Using Multilayer Neural Networks With Application To Mobile Robot Tracking, Irfan Ganie, S. (Sarangapani) Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Presents a Novel Lifelong Multilayer Neural Network (MNN) Tracking Approach for an Uncertain Nonlinear Continuous-Time Strict Feedback System that is Subject to Time-Varying State Constraints. the Proposed Method Uses a Time-Varying Barrier Function to Accommodate the Constraints Leading to the Development of an Efficient Control Scheme. the Unknown Dynamics Are Approximated using a MNN, with Weights Tuned using a Singular Value Decomposition (SVD)-Based Technique. an Online Lifelong Learning (LL) based Elastic Weight Consolidation (EWC) Scheme is Also Incorporated to Alleviate the Issue of Catastrophic Forgetting. the Stability of the overall Closed-Loop System is Analyzed using Lyapunov Analysis. the …

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Characterization And Modeling Of Sparkless Discharge To A Touch Screen Display, Jianchi Zhou, Cheung Wei Lam, Zhekun Peng, Daryl G. Beetner, David Pommerenke Jan 2023

Characterization And Modeling Of Sparkless Discharge To A Touch Screen Display, Jianchi Zhou, Cheung Wei Lam, Zhekun Peng, Daryl G. Beetner, David Pommerenke

Electrical and Computer Engineering Faculty Research & Creative Works

Although Corona Discharge to a Touchscreen Display is Not Associated with the Spark, It Could Cause Soft and Hard Failures Due to Electromagnetic Coupling to Sensitive Electronics Beneath the Glass. Experimental Data Were Obtained to Characterize These Sparkless Discharges and an Equivalent Circuit Model Was Constructed to Predict the Resulting Coupling to Touchscreen Electronics. Measurements and Simulation Indicate that a Thinner Glass and a Higher Touchscreen Indium-Tin-Oxide (ITO) Sense Trace Impedance Both Lead to Higher ESD Risk by Delivering Higher Energy into the Sensing IC. a CST Co-Simulation Model is Proposed and is Shown to Model the Displacement Current Accurately. …

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Simplified Equivalent Golden Finger Port Setup For Fast And Accurate High-Speed Channel Simulation, Chaofeng Li, Kevin Cai, Mehdi Mousavi, Manish Kizhakkeveettil Mathew, Bidyut Sen, Donghyun Kim Jan 2023

Simplified Equivalent Golden Finger Port Setup For Fast And Accurate High-Speed Channel Simulation, Chaofeng Li, Kevin Cai, Mehdi Mousavi, Manish Kizhakkeveettil Mathew, Bidyut Sen, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

A Simplified Equivalent Golden Finger Port Setup is Proposed for Efficient, Accurate 3D Full-Wave Simulation for High-Speed Channels. the Bent Connector Pins, Which Mate with the Golden Finger, Are Simplified as Equivalent Cylindrical Pins to Meet the Wave Port Setting Requirements for 3D Full-Wave Simulation. the Effects of the Equivalent Cylindrical Pin Location and Diameter Are Analyzed through 3D Full-Wave Simulation. a Closed-Form Expression is Newly Proposed to Correlate the Location and Diameter of the Equivalent Cylindrical Pin with Respect to the Widely Used Bent Connector Pin. on the Basis of the Closed-Form Expression, the Bent Connector Pin Can Be …

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Decomposition Measurement For Antenna Gain And Radio Sensitivity Of Wireless Receiving System, Chaoqiang Zang, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi Jan 2023

Decomposition Measurement For Antenna Gain And Radio Sensitivity Of Wireless Receiving System, Chaoqiang Zang, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi

Electrical and Computer Engineering Faculty Research & Creative Works

A General Procedure for Decomposition Measurements for Receiver Antenna Gain and Radio Sensitivity based on Received Signal Strength Indicator (RSSI) Reporting is Proposed in This Paper. This Procedure Standardizes the Measurement Steps for Eliminating Nonlinear Error in RSSI Reporting. after Path Loss Calibration and RSSI Uncertainty Calibration, the Real Performance of the Antenna and the Radio Working in the Actual Environment of Wireless Receiving System Can Be Measured. the Antenna Gain is Obtained from the Difference between RSSI Reporting and Transmit Power, and the Radio Sensitivity is Obtained from the Transmit Power. This Method Helps to Improve the Development Efficiency …

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Challenges And Prospects Of Vehicle Ota Spherical Near-Field Measurement Probes, Dao Lin, Zhanghua Cai, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi Jan 2023

Challenges And Prospects Of Vehicle Ota Spherical Near-Field Measurement Probes, Dao Lin, Zhanghua Cai, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Discusses the Issue of Measuring Probe Indicators for Large-Scale Equipment, Such as Automobiles, under Conditions of Offset Configuration. a Simulation of Spherical Near-Field Measurement based on an Offset Configuration is Presented in This Paper. the Measurement Error is Defined According to the Reference Data Calculated by Spherical Wave Expansion Theory. through Comparative Analysis of the Simulation Results, the Main Reason for the Measurement Error is the Insufficient Coverage of the Probe's Beamwidth. by Adjusting the Probe's Radiation Pattern using Simulation Software, an Optimized Probe that Satisfies Near-Field Measurement Requirements under Meter-Level Offset Conditions is Obtained. Finally, based on …

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High-Speed Differential Via Optimization Using A High-Accuracy And High-Bandwidth Via Model, Chaofeng Li, Kevin Cai, Manish Kizhakkeveettil Mathew, Seyedmehdi Mousavi, Muqi Ouyang, Bidyut Sen, Donghyun Kim Jan 2023

High-Speed Differential Via Optimization Using A High-Accuracy And High-Bandwidth Via Model, Chaofeng Li, Kevin Cai, Manish Kizhakkeveettil Mathew, Seyedmehdi Mousavi, Muqi Ouyang, Bidyut Sen, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

A Physics-Based Equivalent Model of the High-Speed Differential Via Pair with High Accuracy and High Bandwidth is Proposed for the First Time. the Proposed Physics-Based Equivalent Circuit Model of the Differential Via Pair Includes the Effect of Adjacent Ground (GND) Vias. the Proposed Model is Verified using 3D Full-Wave Numerical Simulation Results. in Addition, the Change in Electrical Performance Due to Change in Anti-Pad Radius, the Via Pitch and the GND-Via-To-Differential-Via Distance is Analyzed. based on the Analysis, Electrical Performance of Differential Via Pair Can Be Accurately and Rapidly Optimized with Respect to Design Parameters, such as the Via Pitch, …

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Augmented Genetic Algorithm V2 With Reinforcement Learning For Pdn Decap Optimization, Haran Manoharan, Jack Juang, Hanfeng Wang, Jingnan Pan, Kelvin Qiu, Xu Gao, Chulsoon Hwang Jan 2023

Augmented Genetic Algorithm V2 With Reinforcement Learning For Pdn Decap Optimization, Haran Manoharan, Jack Juang, Hanfeng Wang, Jingnan Pan, Kelvin Qiu, Xu Gao, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

Genetic Algorithms (GAs) Use Many Hyperparameters, and Tuning These Parameters Can Determine the Optimization Performance. a GA with an Augmented Initial Population Was Proposed for Decap Optimization but It Had Convergence Issues by Getting Stuck in the Local Minimum. This Work Uses a Reinforcement Learning (RL) Approach to Adaptively Tune the Hyperparameters of GA during its Operation. with This Approach, the Agent Tries to Change the Parameters So that the GA Does Not Get Stuck in the Local Minimum. the Proposed Method Combining the RL Agent and Augmented GA Showed Better Performance in Terms of Solution Quality and Time Cost. …

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Oxidation Layer Formation On Aluminum Substrates With Surface Defects Using Molecular Dynamics Simulation, Emmanuel Olugbade, Hiep Pham, Yuchu He, Haicheng Zhou, Chulsoon Hwang, Jonghyun Park Jan 2023

Oxidation Layer Formation On Aluminum Substrates With Surface Defects Using Molecular Dynamics Simulation, Emmanuel Olugbade, Hiep Pham, Yuchu He, Haicheng Zhou, Chulsoon Hwang, Jonghyun Park

Electrical and Computer Engineering Faculty Research & Creative Works

Aluminum Oxide Layer Affects the Integrity of Electrical Contact and Can Contribute Adversely to Passive Intermodulation (PIM) Behavior in Radio Frequency (RF) Devices, necessitating a Need for Understanding its Formation Mechanism and Realistic Estimation of its Thickness. using ReaxFF Molecular Dynamics Simulation Technique, This Study Investigated the Impact of Surface Defects on Aluminum Oxide Layer Formation. Results Reveal that Crystallographic Orientation Did Not Affect the Kinetics of Oxidation Process of Aluminum. However, the Reaction Kinetics Increased Significantly with Surface Inhomogeneities Such as Cracks, Scratches, and Grain Boundaries. a Non-Uniform Oxide Layer with Thickness Variation in the Range of 72-77% Was …

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Passive Testing Of Electrically Small Antennas In Electronic Systems, Bin Xiao, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi Jan 2023

Passive Testing Of Electrically Small Antennas In Electronic Systems, Bin Xiao, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi

Electrical and Computer Engineering Faculty Research & Creative Works

In This Paper, a Measurement Scheme, Which Eliminates the Interference of the Common Mode Current, for Electrically Small Antennas is Proposed. Firstly, the Causes and Effects of Common Mode Currents Appearing in Passive Testing Are Analyzed. Then, the Influence of Different Outlet Points of Coaxial Cable on the Passive Testing of Antenna is Studied Experimentally and Numerically. According to the Distribution of the Common Mode Currents on the Ground Plane When the Coaxial Cable Feeds the Antenna, the Minimum Current Point is Selected as the Outlet Point of the Coaxial Cable to Reduce the Influence of Common Mode Current. Additionally, …

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