Waleed Khalil | Professor
Electrical and Computer Engineering
ElectroScience Lab
Office: (614) 292-0305 | Khalil.18@osu.edu
The Circuit Laboratory for Advanced Sensors and Systems (CLASS), founded by Dr. Waleed Khalil is an internationally acclaimed research group focusing on the areas of high performance mixed signal RF circuits and systems. CLASS collaborates with and is sponsored by governmental and commercial organizations such as the Air Force Research Laboratory, NASA, the National Science Foundation, the Naval Research Laboratory, and others.
CLASS members use powerful simulation and design tools provided by leading electronic design automation (EDA) tool vendors to produce state of the art RF circuit designs. Additionally, CLASS operates a laboratory used to validate and test fabricated ASIC designs. System scale projects can be tested in an ultra-low EMI/RFI interference environment in an 8 ft x 8 ft x 8 ft RF shielded enclosure with 100 dB isolation of EMI/RFI at 10GHz. Devices can also be characterized over temperature using a Tenney T2 environmental chamber. The T2 environmental chamber can accommodate devices up to two square feet in size and produce temperatures ranging from -75˚C to 200˚C.
In the CLASS lab, fabricated ASICs and systems are characterized using an array of precision electrical test equipment. Wafer and die level designs can be probed using probe stations for circuits up to 110 GHz. Other notable equipment includes RF Network Analyzers and signal generators for measurements up to 40GHz and an Agilent Infiniium 54854A oscilloscope with 4 GHz bandwidth.
(left) Tenney T2 environmental chamber used for thermal cycling and characterization of devices over temperature. (center) CLASS laboratory setup for characterizing a high speed Delta-Sigma Digital to Analog Converter ASIC. (right) EMI/RFI shielding room used for testing and calibration of sensitive circuits and systems.
Dr. Waleed Khalil received his B.S.E.E. and M.S.E.E degrees from the University of Minnesota in 1992 and 1993, respectively, and his Ph.D. degree from Arizona State University in 2008. He is currently serving as an Associate Professor at the ECE department and the ElectroScience Lab, The Ohio State University. He is a founder of CLASS (Circuit Laboratory for Advanced Sensors and Systems) at OSU where he conducts research in digital intensive RF and mm-wave circuits and systems, high performance clocking circuits, GHz A/D and D/A circuits. Prior to joining OSU, Dr. Khalil spent 16 years at Intel Corporation where he held various technical and leadership positions in wireless and wireline communication groups. While at Intel, he was appointed the lead engineer at the advanced wireless communications group, where he played an instrumental role in the development of the industry's first Analog Front-end IC for third generation radios (3G). He established Intel's first analog device modeling methodology for mixed signal circuit design and also contributed to the development of Intel's first RF process technology. He later co-founded a startup group to develop Intel's first RF front-end IC, as a principle leader of the radio transmitter chain. He authored and co-authored 11 issued and several other pending patents, over 50 journal and conference papers and three book/book chapters. Dr. Khalil is a senior member in IEEE and serves in the steering committee for the RFIC Symposium and the technical program committee for the Compound Semiconductor IC Symposium (CSICS).
Dr. Dale Shane Smith earned his BS (2005), MS (2011), and PhD (2013) in Electrical and Computer Engineering from The Ohio State University.
Before joining ESL, Shane worked for more than 15 years in the Department of Physics at the Ohio State University designing, producing, and maintaining electronic systems deployed in leading scientific experiments in the U.S. and abroad. As a part of this work, Dr. Smith was involved in a wide range of activities including the design and development of nanometer scale radiation hard mixed signal ASICs, FPGA based data acquisition systems, medical imaging electronics, chemical vapor deposition diamond detectors, and high voltage power supply systems. His publications relating to this research include 11 journal papers and 8 conference papers. His current research interests include radiation hard mixed signal circuits, high reliability integrated circuits, low noise circuits, and high speed and high resolution Analog-to-Digital Converters (ADCs) and Digital-to-Analog Converters (DACs).
Prof. Eslam Yahya Tawfik leads a research team in the area of Digital SoC Design, Hardware Security & Assurance, AI / Machine Learning, and Secure Hardware Accelerators. He is currently serving as a research Assistant Professor at the ECE department, The Ohio State University. Prior to joining OSU, he served as Assistant Professor in the American University in Cairo, an Assistant Professor in Benha University Egypt, and research associate in INPG France. Prof. Tawfik research got funded by different government and industry agencies such as AFRL, SRC, ADI, Intel, Mentor Graphics, and STMicroelectronics. He is an IEEE Senior Member and he has served as an Organizer, Program Chair, a Technical Program Committee member and a regular Reviewer for several international conferences and journals. In addition to his research activities, Prof. Tawfik has proven teaching experience in digital design, computer engineering, and computer science curriculums.
Jim Alverson Bio coming soon...
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Trevor Dean Is from Alpharetta, Georgia. He received his B.S. degree (Magna Cum Laude) in Electrical and Computer Engineering from The Ohio State University in December of 2017. During his undergraduate career, Trevor worked as an intern at Battelle twice, as an intern at ArcelorMittal and as an undergraduate research assistant in the CLASS laboratory. Currently, he is enrolled in the direct to PhD program at The Ohio State University.
Daron DiSabato received B.S. degrees in Communications and Electrical Engineering from Ohio University, Athens, OH, in 2014. He is currently employed as an electronics engineer with The Design Knowledge Company in Fairborn, OH, where he participates in hardware security research activities with the Air Force Research Laboratory. He is concurrently a student researcher at the ElectroScience Laboratory (ESL) and is pursuing a PhD in Electrical Engineering from The Ohio State University, Columbus, OH. Through his work with the ESL, he has participated in research efforts supporting programs sponsored by the Office of Naval Research, the Air Force Research Laboratory, and the Naval Research Laboratory. His research interests include analog and mixed-signal circuit design techniques for device authentication, hardware metering, 2nd order effects mitigation, high-speed I/O transceivers, and integrated data converters.
Mehmet Akif Eker Bio coming soon...
Sam Ellicott is currently working towards his Ph.D. in Electrical and Computer Engineering at Ohio State University. He received his B.S. (Summa Cum Laude) in Electrical Engineering from Cedarville University in 2019. Prior to joining OSU he interned at the Air Force Institute of Technology (AFIT), Automation and Navigation Technology (ANT) center. His current research interests are RF circuit design, hardware obfuscation, and hardware security.
Roman (Gus) Fragasse (S’14) is currently working towards his Ph.D. in Electrical and Computer Engineering at The Ohio State University. He received B.S and M.S. degrees in Electrical and Computer Engineering from The Ohio State University in 2016, and 2018, respectively. His main areas of focus are analog/mixed-signal, high-speed digital integrated circuit design, and analysis/modelling of photodetector readout systems. His previous research interests were focused on techniques enabling high-speed, energy-efficient memory arrays (e.g., SRAM). His current research interests include analog/mixed-signal design techniques for CMOS image sensor (CIS) design and high-performance read-out integrated circuit (ROIC) design for infrared (IR) imaging. He is currently employed by SenseICs Corporation as a Mixed-Signal Design Engineer where he develops next-generation pixel and readout architectures for visible, NIR, SWIR, and MWIR imagers. Roman has authored or co-authored 4 journal publications and 6 conference publications.
Jen-Chieh (Jack) Hsueh received his B.S. and M.S. degrees in Electrical and Electronic Engineering from National Cheng Kung University (NCKU) and National Taiwan University (NTU), Taiwan in 2011 and 2014, respectively. He also received his M.S. degree in Electrical and Computer Engineering from The Ohio State University in 2017. He is currently working towards his Ph.D. degree at the Ohio State University. Jack was a recipient of Analog Devices Outstanding Student Designer Award in 2018. He is currently working toward the Ph.D. degree at the Ohio State University with his research focused on authentication of hardware security.
Michael Kines is currently working towards his Ph.D. in Electrical and Computer Engineering at Ohio State University. He received his B.S. (Summa Cum Laude) and M.S. in Electrical Engineering from The University of Michigan in 2013 and 2015, respectively. Prior to joining OSU, he worked as a Responsible Engineering Authority (REA) on Analog/RF front-ends for missile guidance systems at Raytheon Missile Systems. He is also the recipient of the Distinguished University Fellowship.
Lucas Nestor Bio coming soon...
Ramy Tantawy is currently working towards his Ph.D. in Electrical and Computer Engineering at The Ohio State University. He received his B.S. and M.E. (with distinction) degrees in electrical Engineering from Northern Arizona University in 2001 and 2003, respectively.
Prior to joining OSU, Mr. Tantawy spent over 10 years in CMOS mixed-signal circuit design mostly in monolithic CMOS and ROIC imaging applications. From 2002 to 2003, he worked at Intel Corporation, Analog Design Center, in Chandler, AZ, evaluating and developing power management techniques for mobile applications. In 2004, Mr. Tantawy joined Micron Technology, Imagining Center (Now known as Aptina Imaging Corporation), in Pasadena, CA, where he worked for 3 years on the design and development of several CMOS image sensor products for the cellular phone market in the Mobile Image Sensor Group. From 2007 to 2014, Mr. Tantawy worked at Forza Silicon Corporation, in Pasadena, CA, where he participated in various technical, business development and leadership roles to design and develop high-performance CMOS image sensors and ROICs for cinematography, medical, automotive, and defense camera system applications. He authored and co-authored 5 patents, and 4 conference papers.
Gary Sung is an undergraduate student at The Ohio State University. He is pursuing a B.S. in Electrical and Computer Engineering and a business minor through the Integrated Business and Engineering Program (IBE). These interests stem from his high school experience in the FIRST Robotics Competition. As an intern at Wright-Patterson Air Force Base, Gary developed wearable technology using perf board. Then, he was introduced to PCB design while working with small businesses at the Center for Design and Manufacturing Excellence (CDME). Now at ElectroScience Laboratory (ESL), he learned to use Cadence to create a mixed-signal 4-layer PCB for imaging application. Gary hopes to develop skills for the upcoming quantum computing workforce.
Jian Teng (JT) Yan Bio coming soon...
Moataz Abdelfattah (Qualcomm) was born in 1986. He received the B.Sc, and the M.Sc. in electrical engineering from Cairo University, Egypt in 2008, and the American
in Cairo, Egypt, in 2012, respectively. From 2010 to 2012, he was with Intel Corporation, Oregon, U.S. He worked on circuit design for Digital Phase Locked Loops. His research focus is on power management for Near and Sub Threshold circuit design
Mo'men Abusareya received his B.Sc. and M.Sc. degrees in electronics and communications engineering from Ain Shams University, Cairo, Egypt in 2010 and 2016, respectively, In 2010 he joined the design team of Silicon Vision LLC, Egypt (Currently part of Synopsys MSIP solution group). He was involved with the development of high speed serial interface circuits, High and low power DC-DC converter solutions and low power wireless transceivers. In 2015 through 2017 Mo’men led a design team on Synopsys MSIP developing Bluetooth LE transceiver IP. His current research interests is radiation hard diamond sensor interfacing. Graduated PhD Electrical Engineering, Autumn 2022
Saeed Alzahrani received his B.S degree in electronics and communication engineering from King Abdulaziz University, Jeddah, Saudi Arabia, and his M.S degree in electrical engineering from the University of Colorado, Colorado Springs. Currently, he is pursuing the Ph.D. degree at The Ohio State University at ElectroScience lab. His current research interests include the design of ultra-low power voltage controlled oscillators, mixers, frequency multipliers and dividers.
Sidharth Balasubramanian (Texas Instruments) received his B.E. degree in Electronics and Communication Engineering from the College of Engineering, Guindy, (CEG) Anna University, India in 2008. He earned his M.S. and Ph.D. degrees in electrical and computer engineering from The Ohio State University (OSU) in 2009 and 2013, respectively.
He was a member of the on-board electronics team of India's first student-built Microsatellite, ANUSAT, from 2005 to 2008, focusing on the design and integration of RF subsystems at the VHF and UHF range and the on-board computer that were eventually deployed in space in 2009. From 2008 to 2010, he was affiliated with OSU's Analog VLSI Lab, working on low-power circuits for medical SoCs. He spent the fall of 2010 at Xtendwave, a Dallas-based startup, to develop a backward-compatible modulation scheme for WWVB systems, which replaced the legacy scheme in 2012, and is currently the modulation format for broadcasting time in the United States of America. He co-invented a low-power mixed-signal receiver that together with the proposed modulation scheme enables over an order of magnitude in improvement in WWVB reception. From 2009 to 2013, he has been with the ElectroScience Laboratory Complex at OSU, developing theory and circuits for high-speed data conversion, beamforming circuits, mm-wave LC VCOs, etc. Since September 2013, he has been with the high-speed products group at Texas Instruments, Dallas and participates in the product development for high-speed RF data converters. He has authored and co-authored several peer-reviewed publications and a book chapter on advances in digital-to-analog converters.
Dr. Balasubramanian was the recipient of The Ohio State University Fellowship in 2008, Bronze Prize at the 2010 TSMC Outstanding Student Research Award, the 2011 Solid-State Circuits Society Travel Grant Award, the National Science Foundation/MIPR Fellowship in 2011, and the Outstanding Journal Article of ElectroScience Lab award in 2012. He was a two-time nominee for OSU's Presidential Fellowship. He was a co-recipient of the Best Paper Award at the 2013 Wireless Innovation Forum and a student paper contest finalist at the IEEE MWSCAS 2013. He is listed in the Who's Who in America 2015. He is a member of Eta Kappa Nu (HKN), the honor society of the IEEE. He currently serves as the vice-chair of the IEEE Circuits and Systems Society - Dallas Chapter and on the steering and technical program committees of the IEEE Dallas Circuits and Systems Conference, and the Texas Wireless and Microwave Symposiums.
Matthew Belz (Ph.D. Student at University of Michigan) is an undergraduate from Columbus Ohio majoring in Electrical and Computer Engineering. He joined CLASS in 2016 and is pursuing his BSECE with Honors Research Distinction. Matt interned in the RF department at Harris Corporation during the summer of 2017 and worked on jamming resistant radio systems. His current research is focused on mm-Wave VCO modeling and design for RF integrated circuits. In the fall of 2019 he will be starting as a PhD student with Dr. Michael Flynn at the University of Michigan
Matthew Casto (AFRL) received his BS and MS degree in Electrical Engineering in 2003 and 2005 respectively from Wright State University in Dayton, OH. He recieved his PhD from Ohio State University in 2017. He is a member of the IEEE and has authored or co-authored more than 10 publications in the areas of non-linear and electro-thermal device modelling, advanced mixed-signal characterization, and solid state power amplifier design. Dr. Casto is a Branch Chief at the Air Force Research Laboratory's Sensors Directorate and is working on trustworthy, reliable mixed-signal integrated circuits.
Kennedy Caisley is working toward a Ph.D. in Electrical and Computer Engineering at Ohio State University. Prior to joining OSU, he received a B.S. in Electrical Engineering from the University of Idaho in 2019 and interned at Schweitzer Engineering Laboratories designing embedded hardware. In addition to electronics, he enjoys rock climbing and synthesizers.
Chris Creech graduated from OSU in December of 2016 with a B.S. in Electrical and Computer Engineering. During school he held an internship focused on computational electromagnetics modeling and simulation. He was also a research assistant for the ESL focusing on printed circuit board design. Upon graduation, Chris became an electrical design and analysis engineer for the Space Launch Systems rocket program with The Boeing Company. Responsibilities included understanding the entire avionics architecture, analyzing data to verify system requirements, and helping design the time distribution system for the Exploration Upper Stage. He authored a research paper based on his time distribution work. In November of 2018, Chris accepted a position as an electrical hardware design engineer for a hypersonic missile program with Lockheed Martin. He was the lead hardware design engineer for the hardware-in-the-loop and system-in-the-loop systems to validate flight software and missile-to-aircraft communications. In April of 2020, Chris joined GLC Technologies, Inc. as the lead electrical engineer helping to execute programs related to trusted microelectronics and hardware assurance. He rejoined OSU in August 2020 to pursue a MS degree in Electrical and Computer Engineering.
Justin Dennison (APL) was born and raised in Columbus, Ohio. He received his B.Sc in Electrical and Computer Engineering from the Ohio State University in 2014. Justin is currently working on his Master's Thesis under Prof. Khalil and officially joined C.L.A.S.S group as a GRA in Summer 2015. He has previously worked as a Graduate Teaching Assistant (GTA) in the Engineering Education Innovation Center (EEIC) teaching Fundamental of Engineering Courses at OSU. His research interests include RFICs, wireless communications, mixed signal design, and audio processing.
Luke Duncan (The Design Knowledge Company) earned his B.S. (2009), M.S. (2012), and Ph.D. (2016) degrees in Electrical and Computer Engineering from the Ohio State University. His interests include the design of analog, mixed-signal, and RF circuits. During his M.S. studies, Luke was funded by a Texas Instruments fellowship and completed 12 months of internship experience that included integrated circuit design involving high speed FET switches and a USB3.0/PCIe/SATAIII redriver. His M.S. thesis covers the design of fast-transient low-dropout regulators.
Salma El-Abd (Intel) earned her B.Sc. degree with honours in Electronics and Communication Engineering from the Faculty of Engineering, Ain-Shams University, Cairo, Egypt. She is currently working towards her Ph.D. at The Ohio State University. She was the recipient of The Ohio State University Fellowship in 2010/2011. Her research interests include the design of voltage controlled oscillators and dividers running at the mm-wave frequencies, PLLs, RF PWM modulators, RF power amplifiers, switched DC/DC voltage regulators and current references.
Ahmed Elsayed Graduated MS Electrical Engineering, Autumn 2022
Tim Heaton is currently a masters student working on high speed digital design.
Tyler Heaton is a masters student working on trusted hardware IP infrastructure.
Matthew LaRue (Northrup Grumman) was born and raised in Convoy, OH. In 2012 he graduated magna cum laude from Valparaiso University with a bachelor's degree in electrical engineering. While at Valparaiso University, he served as president of the Tau Beta Pi engineering honor society and conducted research on Quantum-dot Cellular Automata. He is now enrolled in the direct PhD program at The Ohio State University. He is the recipient of the Tau Beta Pi Fellowship, NASA Space Technology Research Fellowship, and a University Fellowship.
Brandon Mathieu (AFRL) is from Bloomingdale, Ohio. He received his B.S. in Computer Engineering (Magna Cum Laude, 2014), M.S. in Electrical Engineering (2015) and is currently working towards his Ph.D in Electrical Engineering all at The Ohio State University. He completed internships at Caterpillar, Chrysler and Advanced Integration LLC during his undergraduate studies. His research interests include mixed signal design, reconfigurable circuits/systems and direct digital synthesis. He received a DAGSI/AFRL fellowship in 2014 & 2015.
Jamin McCue (Northrop Grumman) was born in Clarksburg, West Virginia, in 1987. He received his B.S. degree in Electrical Engineering from Cedarville University in 2009 and subsequently joined the Ohio State University where he earned his Ph.D. His research interests include integrated RF transceivers, high speed mixed signal design, and high speed I/O circuits. Jamin received a fellowship from the AFRL in 2010 and continues to work in association with the AFRL Sensors Directorate.
Ahmed Naguib (Military Technical College) received his B.Sc. degree and the M.Sc with honors in electrical engineering from the Military Technical College (MTC), Cairo, Egypt in 2006 and 2013, respectively. Previously, he was involved in designing low power and low noise circuits for biomedical implantable devices. He is currently working towards his Ph.D in Electrical Engineering at The Ohio State University. His interests include the design of analog, high-speed mixed signal, and RF circuits. His research involves the design and calibration of high speed Digital to Analog Converters (DACs).
Lauren Pelan Bio coming soon...
S M Shahriar Rashid (Skyworks) is a PhD student of the department of Electrical and Computer Engineering of Ohio State University. He completed his Bachelor and Master's Degrees both from the department of Electrical and Electronic Engineering of Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh in 2009 and 2011 respectively. He is awarded University Fellowship for the year 2012-2013. Previously, he was involved in designing the receiver front end of a high speed intra-chip wireless interconnect system with on-chip integrated antenna. He is currently involved in the design of high power PWM transmitters using GaN technology. Mr. Rashid's research interests include RF, Analog and Mixed Signal Integrated Circuits and Systems. He was the recipient of The Ohio State University Fellowship in 2012/2013.
Lindsey Spangler Graduated MS Electrical Engineering, Autumn 2022
Chris Taylor is currently working towards his Ph.D. in Electrical and Computer Engineering at The Ohio State University. He received his B.S. (Summa Cum Laude) and M.S. in Electrical Engineering from Wright State University in 2012 and 2014, respectively. Prior to joining OSU he spent 2 years as an electronics research engineer at the Air Force Research Labs Sensors Directorate. His current research interests includes, hardware security, hardware obfuscation and asynchronous design.
Qiyang Wu (Apple) received his M.S. and Ph.D. degrees in Electrical and Computer Engineering from the Ohio State University in 2011 and 2013, respectively. Since 2013, he has been working as an RF engineer at Apple Inc. Prior to that, Dr. Wu was working on mm-wave transceiver and component design. His research interests are in the high-speed digital I/O and RF front-end design for wireless communications. Dr. Wu was the recipient of The Ohio State University Fellowship in 2008 and the NSF/MIPR Fellowship in 2011.
Samantha Yoder (AFRL) received the BS, MS, and PhD degree in electrical engineering from The Ohio State University. She received the SRC Fellowship in 2008, DAGSI fellowship in 2010, and the four-year SMART fellowship in 2011. Her research interests include high-speed digital-to-analog converters, time-based analog-to-digital converters, and delta-sigma modulators. She interned with the Air Force Research Laboratory, Dayton Ohio in the summers of 2011 and 2012.
