David K. Choi, Ph.D.
`
`2517 Lexington St.
`Lafayette, CO 80026
`(858) 352-8889 (mobile) (720) 598-8510 (office)
`email: dchoi@rfdesignconcepts.com
`http://www.rfdesignconcepts.com
`
`Employment History
`
`RF Design Concepts, Ltd., Expert Witness, RF Design, Turn Key Solutions 02/2012–Present
`
`Principal & Owner
`• Expert Witness, Patent Litigation & Technical Due Diligence– Wilmer Hale, Fish &
`Richardson, Alston & Bird, Perkins Coie, Kirkland & Ellis, Weil, Pillsbury Winthrop
`Shaw Pittman, Slayden Grubert Beard, Hoyng Rokh Monegier, Mintz-Levin
`• Subject Matter Expert in RF Power Amplifiers, Transmitters, RF Front-end Modules,
`Power Management, Semiconductors, Digital Electronics
`
`– Consultant, Ultra compact high efficiency load adaptable power amplifier– Draper
`Laboratory
`– Consultant, Ku-band SSPA, C-band RFPA– Trak Microwave
`– Consultant, 24 GHz Radar Front-End – The Ohio State University
`– Consultant, Ultra high efficiency wireless charging– NuCurrent, Inc.
`– Consultant, Ultra high efficiency RF plasma generation– Advanced Energy
`– Consultant, DARPA MIS superconductor fabrication program– Grid Logic, Corp.
`– Consultant, Quantum devices– ColdQuanta, Inc.
`– Consultant, LTCC “RF” module for optical communications– AvoPhotonics, Inc.
`– Consultant, RF front-end module– Trellisware
`– Consultant, Market/System ecology analysis of nascent technologies– Invensas
`– Product Manager (Consultant)– UX Lab, Samsung Electronics
`– Custom Design of RF power amplifier solutions for commercial wireless (cdma,
`WCDMA, LTE), defense (radar, EW, SIGINT, etc., medical (MRI, RF ablation),
`and industrial (RF induction heating, metal sputtering, plasma generation, etc.)
`– Custom Design of DC power management systems, including Switched-mode (Buck,
`Boost, Buck-boost, etc.) and linear (LDO) power supply designs
`
`Mercury Systems, Inc., RF Power Amplifier Business Unit
`
`08/2013–03/2014
`
`Technical Director
`• Responsible for all aspects of Mercury Systems’ RF Power Amplifier Business Unit
`– Full P&L responsibility for $2.5M RF Power Amplifier Business Unit
`– Responsible for engineering, sales, manufacturing, and test
`– Develop new business opportunities through direct customer contact and proposals
`(Technical concept, cost models, etc.)
`– Lead and manage new product development and sustaining engineering efforts
`– Manage development and production schedules, material planning, product testing
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`– Manage customer relationships
`
`LGS Bell Labs Innovations, R&D Hardware Engineering
`
`05/2011–12/2012
`
`Sr. R&D RF Hardware Engineer (Technical Ladder, Grade 315)
`• Development of high power, highly linear and efficient RF transmitter solutions sup-
`porting major wireless standards (GSM/EDGE, cdma, WCDMA, LTE)
`
`– First-pass design success of (200W P1dB) 850MHz and (250W P1dB) 900MHz
`band Doherty RF transmitters
`– First-pass design success of highly linear, thermally compensated TX lineups for
`746-960MHz and 1805-2170MHz broadband transmitters
`– Development of high power (46dBm avg), broadband, highly linear RF transmitter
`• Technical leadership/project management
`– Coordinate activities of multi-disciplinary teams of RF/electrical engineers, me-
`chanical engineers, drafters, and technicians
`– Insure adherence to proper engineering design practices and manufactureability;
`Internal design review
`
`Aethercomm, Inc., Advanced Development Group
`
`07/2008–02/2011
`
`Technical Manager/Principal Engineer
`• Design Engineering Responsibilities
`– Responsible for complete execution of rapid product development of pulsed/CW,
`wideband, high power RF transmitters for radar and communications on extremely
`accelerated schedules per MIL-STD’s: Silicon LDMOS, GaAs FET & HBT, and
`GaN HEMT device technologies
`– Customer specification to top-level design, complete electrical design (RF link bud-
`get analysis, RF circuitry, DC power management, control logic, telemetry, fault
`protection, etc.), bill of materials (BoM), test procedures, and design verification
`testing
`– Lead, manage, and coordinate activities of multi-disciplinary teams of RF/electrical
`engineers, mechanical engineers, drafters, and technicians
`– Identify and execute, internal R&D programs, including SBIR’s
`• Technical Management Responsibilities
`– “Cradle to grave” management of all technical aspects of product development to
`insure successful, on time delivery of custom RF products
`– Product documentation and design milestone reviews: Compliance matrix, ECN’s,
`test plans (ATP, DVT, TDR), final product approval, and post mortem reports
`– Maintain competent & effective staff through recruitment, mentoring, and perfor-
`mance planning of technical personnel
`– Insure adherence to good engineering design practice and manufactureability; Re-
`view designs through all engineering phases
`– Support upper management and marketing through customer interaction, speaking
`in technical forums, and writing technical publications
`– Resource & budget planning, allocation, and scheduling of all group activities
`
`Samsung Electronics, Technology Intelligence & Collaboration
`
`03/2007–07/2008
`
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`Section Manager, Technology Strategy Team
`
`– Technical feasibility and business opportunity analysis of bottom-up nanotechnology
`for next generation digital storage, wearable electronics, and non-lithographic semicon-
`ductor technologies
`
`– Market and technology analysis of (low-power wireless) biomedical electronics
`
`– Market and technology analysis of THz imaging for security, healthcare, and industrial
`applications
`
`RF Micro Devices, Infrastructure Products Group
`
`07/2006–02/2007
`
`Group Leader/Staff Engineer
`
`– Advanced Product Development: GaN HEMT dual carrier UMTS (2.14 GHz WCDMA)
`Doherty basestation transmitter (240 W max./40 W avg. RF power)
`
`– Led development of scalable GaN HEMT non-linear simulator model
`
`– Project planning, product documentation (PRD, PPA, etc.), and test plan development
`
`Nokia Corporation, Nokia Research Center
`
`04/2001–03/2006
`
`Senior Research Engineer, Radio Technologies Laboratory
`• Advanced RF Research:
`– RF Circuits: Complete design, build, test, and system integration of novel LDMOS
`based Chireix Outphasing (basestation) transmitter for UMTS systems (120W
`max./20W avg. RF power)
`– RF Systems: Development of OFDM RF system simulator (IEEE 802.11a WLAN
`& ETSI EN-300 744 DVB-T PHY); Baseband PAPR reduction techniques for
`OFDM radio systems
`– Power Management: Complete design, build, and test of high power, high preci-
`sion, 16 bit digitally-controlled switched-mode power supply
`• Project Management:
`– Technical Liaison: Advise on new technologies offered by established and new ven-
`ture organizations in collaboration with Nokia Ventures and Nokia Mobile Phones
`New Technology Sourcing
`– Advise and steer corporate funded university research projects
`– Group leader, Leading Science 8 program, led market research and analysis for
`“Network and Infrastructure Solutions in Low Average Revenue per User (ARPU)
`Markets”
`
`Western Digital Corporation/Adaptec Inc.
`
`01/1995–08/1996
`
`Digital Design Engineer, ASIC Design
`• Timing Analysis: Static timing analysis of ASIC critical path delays; Custom cell
`characterization and library generation
`• Clock Tree & Pad Cell Drivers: Clock tree timing analysis and design; Custom ASIC
`pad cell design
`• Power ON Logic: Developed “No re-spin” solution for faulty ASIC ACK/Power Enable
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`• Meta-stability Analysis: Circuit and system level analysis of meta-stable logic
`
`Academic History
`
`University of Colorado, Boulder
`
`03/2013–03/2014; 08/2015–08/2016
`
`Adjunct Professor, Department of Electrical, Computer, & Energy Engineering
`University of California, San Diego
`
`08/2004–08/2008
`
`Visiting Scholar (Part-time), Department of Electrical & Computer Engineering
`• Established LoA between UC San Diego, Cree Microwave, Inc., and Nokia for collab-
`orative research on the Envelope Tracking (ET) highly linear and efficient transmitter
`architecture
`• Coordination of corporate sponsored research on linear, highly efficient transmitter
`architectures
`
`University of California, Santa Barbara
`
`09/1996–03/2001
`
`Doctor of Philosophy, Electrical & Computer Engineering– Solid-State Electronics (major),
`Analog/Digital Circuits (minor); Dissertation title: High Efficiency Switched-Mode Power
`Amplifiers for Wireless Communications
`California State University, Fullerton
`
`08/1994–01/1996
`
`Master of Science, Electrical & Computer Engineering– Analog/Digital Circuits (major)
`University of California, Berkeley
`
`08/1990–05/1993
`
`Bachelor of Science, Physics
`
`Selected Publications
`
`T. Hung, D. K. Choi, L. E. Larson, P. M. Asbeck, “CMOS Outphasing Class-D Amplifier With Chireix
`Combiner,” IEEE Microwave and Wireless Components Letters, 8:619-621, August, 2007.
`
`I. Hakala, D. K. Choi, L. Gharavi, N. Kajakine, J. Koskela, R. Kaunisto, “A 2.14-GHz Chireix Outphasing
`Transmitter,” IEEE MTT Trans, 4:2129-2138, June, 2005.
`
`D. Qiao, D. Choi, Y. Zhao, D. Kelly, T. Hung, D. Kimball, M. Li, P. Asbeck, “Antenna Impedance Mis-
`match Measurement and Correction for CDMA Transceivers,” IEEE MTT-S Digest, WE3C-4, Long Beach,
`CA, June, 2005.
`
`D. K. Choi and S. I. Long, “The Effect of Transistor Feedback Capacitance in Class-E Power Amplifiers,”
`IEEE Trans. on Circuits and Systems I, Vol. 50, Issue 12, pp. 1556-1559, December, 2003.
`
`D. K. Choi and S. I. Long, “Finite DC Feed Inductors in Class E Power Amplifiers– A Simplified Ap-
`proach,” IEEE MTT-S Digest, TH2D-5, Seattle, WA, June, 2002.
`
`D. K. Choi and S. I. Long, “A Physically Based Analytic Model of FET Class E Power Amplifiers– De-
`signing for Maximum PAE,” IEEE MTT Trans, 47:1712-1720, September, 1999.
`
`Other Professional/Personal Information
`
`US citizen, US Secret & Top Secret/SCI (In-active) clearance, Senior member IEEE, California State
`MICRO Fellow (1996), fluent in the Korean language, conversant in the French language.
`
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