YIQUN LORI JIANG

**** ***** *** **, *********, WA 98075

Phone: 425-***-****(Home) 206-***-****(Cellular) Email: acqqxj@r.postjobfree.com

SUMMARY

MSEE, PhD in Electromagnetics; 20 years of electrical & RF engineering experience; Solid knowledge of theories, standards, and specifications of modern wireless technologies, such as 2G/3G/4G/4G+ cellular, Bluetooth, WiFi, etc. Extensive hands-on design verification experience in all areas with emphasis on cellular LTE in recent years; Strong RF background also includes RF circuit, antenna system, EMC/EMI design, characterization, simulation and testing; Good problem solving skills, self-motivated, and team worker.

HANDS-ON HW DESIGN & VERIFICATION

Cellular Technologies on Mobile: LTE, LTE+, UMTS, GSM, CDMA, etc.

Wireless Systems: WiFi, Bluetooth, Xbox ISM radio, VHF airborne radio, microwave relay systems, etc.

Other Systems: Doppler ultrasound transceiver, fiber optic modem, dial-up modem, etc.

RF Component: LNA, mixer, filter, synthesizer, transmission line, antenna, matching network, coupler, PA.

Other Component: audio, fiber optics, LCD, HDD, RS232/422, USB, Ethernet, JTAG, UART, I2C, etc.

Power Management: DC-DC converter (linear, switching, low drop), filtering, battery charging, etc.

Digital: imbedded PC, microcontroller/processor, ADC, DAC, digital synthesizer, digital PLL.

PCB SKILLS

Circuit Simulation: MATLAB, Simulink, MathCAD, HFSS, Serenade, ADS, CST, etc.

Schematic Capture: Viewlogic, OrCAD, etc.

PROGRAMMING SKILLS

Numerical Simulation/Scientific Computation: FEM, MoM, GTD, FDTD, sparse matrix, iteration solver

Microcontroller firmware development: PIC family (12C508, 16C63), PLD (various), etc.

EXPERIENCE

01/06 - present: RF Verification Engineer

Surface Cellular Team, Zune RF Group, Xbox RF Team, Microsoft, Redmond, WA

Key responsibilities include but not limited to:

In-depth knowledge of wireless technologies, industrial standards, test configurations & specifications.

Develop, implement and document test plans with best-in-class RF test methodologies.

Define, develop & automate robust test architecture applicable to specific feature, layout, & enclosure.

Deep and thorough failure analysis to identify root cause among test system, configuration, and DUT.

Beyond conformance, perform RF parametric characterization to further evaluate DUT performance.

Conduct comprehensive data analysis & feedback to HW design revisions.

Perform EMC/EMI analysis to understand interference among coexisting transceivers on PCB.

Wireless technologies and projects worked on:

LTE/LTE+ UE design verification using R&S and Anritsu conformance systems: assisted in debugging test script errors from initial release to matured release; completed DUT design/verification cycles from DoE to PV, including extreme condition and carrier certification testing.

2G/3G UE design verification using Agilent conformance/DVT system: extensive effort spent on identifying SW issues & configuration errors; went through all phases of DUT verification and certification.

Involved in GPS/A-GPS conformance verification using Spirent system.

WiFi/BT/HD radio design verification & EMC/EMI testing for Zune from prototype to production.

RF parametric testing of radio transceiver on Xbox peripherals: completion of the project life cycle.

01/05 – 12/05: Hardware Design Engineer

Spencer Technologies, Seattle, WA

Involved in hardware design/development of 2nd generation M-mode Doppler ultrasound system:

Improved receiver RF front end low noise circuitry: achieved better sensitivity/dynamic range.

Improved transmitter circuitry: achieved robust power control and RF burst shaping.

Conducted functional, quality, and environmental tests according to FDA regulations.

Assisted in transition from R&D to manufacturing: technical support & documentation.

04/02 -12/04: Electrical/Optical Engineer

Traffic Fiber Systems, Inc., Issaquah, WA

In charge of new product development (high-speed fiber optic modems/smart dial-up modems):

Conducted hardware architectural redesign for company’s fiber optic modem series (multi-mode, single-mode and laser) incorporating new features desired by customers.

Re-designed fiber optic modem circuit board where better components & circuit technologies were adopted. Significant improved data rate, receiver dynamic range and sensitivity.

Developed a new product of industrial smart dial-up modem featured at environmental hardened hardware, low power consumption, battery backup, auto-dial, and PIC control.

Built test fixtures for quick bench-top testing and troubleshooting hardware and software.

Documentation: schematics, BOMs, functional diagrams, test procedures and test reports.

09/99 - 03/02: RF Design Engineer

Universal Avionics Systems Corporation, Redmond, WA

In charge of the development of airborne VHF radio in CommNav Datalink system; Responsibility covers all aspects of product development life cycle: system design, component selection, circuit prototyping, functional and performance testing, environmental testing, and documentation.

Performed radio system architectural design based on specifications & requirements defined by Datalink and aircraft I/O standards for CommNav avionics.

Cooperated with SW engineer to specify requirements for radio embedded control, real-time monitoring, and data I/O sub-systems.

Designed the high efficiency transmitter sub-system: evaluated power transistors; designed matching networks; optimized DC bias current for balanced power level and spectrum purity.

Designed a novel analog VHF power control loop that limits the transmission power variation to within 5% under temperature extremes.

Designed a highly integrated digital frequency synthesizer featuring large frequency capturing range, low noise and fast acquisition time.

Optimized receiver subsystem (front-end LNA, tracking RF filter, down converter, mixer, IF amplifier/filter, audio envelope detector): dynamic range >120dB and low NF at all 760 channels.

Conducted FCC/FAA quality and environmental tests: vibration, EMC/EMI, and thermal.

01/94 - 08/99: Research Assistant

Computational Electromagnetics Laboratory, ECE Department, Clemson University, SC

Research emphasized on numerical analysis/simulation of RF systems w/ PO, GTD, MoM, FEM, and FDTD:

Principal researcher of a DoD project “Electromagnetic Analysis of Microwave Absorbers”: design, simulation validation and optimization.

Developed a 3D vector hybrid finite element formulation for generic doubly periodic structures. Verified on wide range of practical RF systems including filters and phase array antennas.

Performed numerical modeling and testing for various antenna prototypes to achieve selective radiation patterns in a smart antenna research project: slotted cylindrical, wire and printed antenna arrays.

Simulated and analyzed various microstrip circuit components using HFSS to investigate characteristics in millimeter wave range: filter, coupler, splitter, and oscillator, etc.

04/89 - 12/93: RF Design Engineer

Research Institute of Telecommunications, Telemetry & Telecontrol, China

Involved in system design for microwave replay communication systems: link budget design, spectrum management, coverage & interference analysis, performance evaluation and optimization.

Designer of a base-band equalizer to overcome ISI using cutting-edge technologies.

Co-designer of a high-quality 70MHz QPSK modem for a terrestrial digital microwave relay system.

Designer of a highly integrated novel multiplexing system for a TDMA point-to-multipoint wireless system.

EDUCATION

PhD in EE, RF Engineering & Computational Electromagnetics, Sep. 1999, Clemson University, SC

MS/BS in EE, April 1989/July 1986, Changsha Institute of Technology, P.R. China

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