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RF Circuits and Wireless Communications Systems Expert

Technical Consultant #2343


  • RF power amplifiers and transmitters; RF Circuits and Systems for cellular, wireless.
  • Power electronics (Power management).
  • Analog circuits.
  • Semiconductor devices.
  • Electrical and electronic engineering.

RF Power Amplifier Design

  • Architectures: High power output stages, full TX chain, and integrated RF front end.
  • Form factors: Pallet (open and shielded), module (fully enclosed).
  • Up to 20GHz. and 3kW.
  • Bandwidths: Decade or greater.
  • Modes of operation: Class A, Class AB/B, Class C, Class D, Class E, and Class F.
  • RF Device technologies: LDMOS, GaN HEMT, GaAs FET/HEMT/pHEMT/HBT.

Linear Transmitter Architectures

  • Doherty RF Power Amplifiers.
  • Outphasing transmitters.
  • Pre-distortion (closed loop RF).
  • Control features: RF output blanking (enable/disable), EMI filtering, gain/power control (external/automatic), temperature compensation (open/closed loop), and telemetry.
  • Protection and filtering: DC input protection, RF input and output protection, over temperature shutdown, bias sequencing, EMI filtering
  • Control Interfaces: TTL/CMOS logic, I2C, USB, etc.

DC Power Management and Design

  • ON/OFF to a complete power management system with several levels of voltage conversion and inversion, protection circuitry, noise and EMI filtering.
  • RF design concepts; specified RF power amplifier design or as a stand-alone module for virtually any electronic or electrical apparatus.
  • Switching DC-DC: Buck, Boost, Buck-Boost.
  • Under and over voltage lockout (UVLO/OVLO).
  • In-rush, total current limiting.
  • Reverse polarity, ESD, lighting protection.
  • Noise and EMI filtering.
  • Bias sequencing.
  • LED Drivers.
  • Low Drop Out (LDO) Linear.

Expert Witness Experience

  • California Superior Court: Civil litigation, testifying expert.
  • International Trade Commission: Consulting (Subject Matter Expert).
  • U.S. District Court.


Undisclosed Company, Principal and Owner, 2012 - Present

Expert Witness

  • Patent litigation - Technical Due Diligence
  • Civil litigation

Design Consulting Projects

  • Ku-band SSPA, C-band SSPA
  • Ultra high efficiency wireless charging
  • High speed LTCC optical communications module
  • Ultra compact high efficiency load adaptable power amplifier
  • Design Consultant - DARPA MIS superconductor fabrication program

New Business and Patent Support

  • Served numerous international and domestic clients, from Fortune 100 companies to startup/venture organizations.
  • Patent technical analysis.
  • Analysis of prior art, and claims.
  • Infringement contention charts.
  • Claim construction.
  • Expert witness reports.
  • Reverse engineering.
  • Deposition.
  • Expert Testimony.

Mercury Systems, Inc., Chelmsford, MA, Technical Director, 2013 - 2014

  • Full profit and loss responsibility for Mercury's $2.5 million RF power amplifier business unit.
  • Responsible for engineering, sales, operations, manufacturing, and test.
  • Developed new business opportunities through direct customer engagement and proposals.
  • Led and managed new product development and sustaining engineering.
  • Managed development and production, material planning, product testing.

University of Colorado, Boulder, CO, Professor, 2013 - 2016

  • Course Instructor, ECEN3250 (Microlectronics).
  • Ph.D. committee member.

Honors & Publications


  • Korean (Conversational)

Academic and Professional Affiliations

  • Institute of Electrical and Electronics Engineers-IEEE Member


  • Author and Co-Author of publications in peer reviewed journals


  • Ph.D. Electrical and Computer Engineering, University of California, Santa Barbara, CA
  • B.A. Physics, University of California, Berkeley, CA
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