Electrical Engineer Test

Jianhua Ying

Livermore, California US, *****

Cell phone: 408-***-****

Summary

Please see: linkedin.com/in/jianhua-ying, 8 pictures (some in Chinese).

- Sr. Electrical Engineer in the System, Circuit, Device, and Material.

- Extensive experience in the design and manufacture of Analog/Mixed signal circuits, and systems; Power supply units; System control units; Mechatronics units; And prototype creation.

- Understand the selection of material, components, devices, structures, and subsystems; Well-know of the characteristics of the Bipolar, CMOS devices, and Components; Device model; Circuit simulation and synthesis.

- PCB design; FPGA design; DFT; DFM; DFC; Design and implement flip-chip solder in micro-BGA; Design of flip-chip process using copper pillars bump.

- Experience in circuit stability with feedback loop optimization; RF Impedance matching; Switch softly with EMC; Nonlinear treatment with device characteristics in the circuit; Current and voltage sharing technique; ESD protection; Heat flux out and thermal stability for equipment.

- Assist the company in making technical development plans; Organize technical breakthroughs; Take ownership of critical design and perform issues.

- Versed in OrCAD, Altium, Matlab, C. Simulation software SPICE, HSPICE. Virtuoso verification tools, VHDL coding for FPGA.

- Willing to work on troubleshooting of electronic systems, circuits, devices that have some mysterious symptoms.

Education:

Sep. 1986 ~ Jun. 1989 (Master of Microelectronics Engineering.) Dept. of Electronics Science and Technology. Huazhong University of Science and Technology. http://www.hust.edu.cn

Sep. 1974 ~ Jun. 1977 (Bachelor of Microelectronics Engineering) Dept. of Electronic Engineering. Huazhong University of Science and Technology. Professional Experience:

Inphenix Corp. Livermore CA 94551, Nov 2021 – July 2024 Fab. (Clean room) Engineer

Semiconductor super luminous LED chip process, laser chip bar facet coating. Semiconductor MEMS technology Silicon bottom wet trenching. Fab equipment maintenance.

Nevro Corp. Redwood CA 94065 June 2021 - July 2021 Sr. Test Engineer in contract.

Test and analysis at the wireless charger circuit in medical device. Redesign at the charger pulse circuit and report the solution documents. Jabil AOC. Pleasanton CA 94588 February 2017 - March 2019 Electrical Engineer

· Design of Laser array (VCSEL) system board in mixed signal. Design TEC controller system for high power Tunable laser use. Design micro socket adapter with tiny pogo pins (300um) for VCSEL module. Design of MicroMAX attachment process to VCSEL chip with flexible PCB; Design of flip-chip soldering process with the BGA

(pitch0.8mm) of Cstar device to CFP2 PCB module; Device and system test and analysis in High Temp. High Humidity. Research of nanometer material sealing in the optical module; Maintenance of the equipment's in the clean room; Coach the people. Optoplex Corp. Fremont CA 94538 September 2015 ~ April 2016 Test Engineer

· Developing in balance amplifier and VSWR, Impedance Matching for LiDAR; Developing in High Power EDFA Driver PCB Board. Research of deviation of wavelength of power peak in optical module. Troubleshooting and Failure analysis in the system. Write report and product traveler. Optical Channel Monitor test; Tunable Filter test; MEMS Optical Channel Monitor test; RMA with Optical modules.

· Using Optical Spectrum Analyzer Ando AQ6317B; Network Analyzer HP 8753E Newport Swept-Wavelength Tunable Lasers EXFO Broadband Source - FLS-2200 NeuroSky Inc. San Jose, CA 95113 November 2012 – August 2015 System Engineer

· Design and built the circuit prototype of wearable product Wristband, Headset.

· Design of system function, check of circuit module, interface and devices. Material and components choice for Electrocardiography and Electroencephalography. Evaluation of lithium battery efficiency.

· Create fixtures for human body signal and data mining. Design software to analysis the SNR of the signal data. Troubleshooting in circuit system and devices. Design of laser cutting process for products.

· Function Generator Agilent 33270A; Oscilloscope Tektronix MSO 4034; Differential Amplifier Tektronix ADA400A; Dynamic Signal Analyzer HP 35670A; Mind Wave Mobile Start Kit by NeuroSky; TGAM (12bit) EEG tester (software); MATLAB Data Analysis.

Calmar Laser Inc. Sunnyvale CA 94086 June 2012 - September 2012 Consultant

· Check the laser equipment; Check the procedure and traveler; Circuit troubleshooting; High power Laser screening test design; High power supply redesign; Create fixtures for test.

InPhenix Corp. Livermore CA 94551 March 27, 2011- August 2011 Engineer

· Research on optical power drifting with temperature in Laser Diode and Super Luminescent LED.

· Photolithography and E-beam evaporation process with Titanium, Platinum, and Aurum; RTA (rapid thermal annealing) analysis with interface in multi-layer thin film. Integrated circuits design center of HUST Wuhan, China 430***-**** to 2010 Sr. Principal Engineer

· Fast Charging Station System Designed for Electric Bicycles in fly-back topology, the output voltage range is DC24V-80V, the max power is 500W.

· PWM high power KW buck power supply with thermal shutdown and under voltage lockout units.

· Design of High precise (+-0.5ppm/ T) real-time clock circuit product with lower consumption in digital trimming circuit.

· Manufacture in Real-Time Clock circuit with low power consumption Supply voltage 1.6v -5.5v.

· Design of Micro power boosting DC-DC converter less then 1uA in shutdown mode, limited current 350mA, Vin 0.9V, Vout 34V, efficiency 85%.

· Design of PWM buck converter circuit with peak current loop in BCD05 process, regulation 0.1% during supply voltage 4.7~15V, out 3.3V/3A.

· Design of a high-speed charge-pump phase-locked loops (PLL) for clock recovery circuits. Psupply:3.3V, Foutput:1.25GHz, Finput:625MHz, lock time: 200ns.

· Board design for Class D audio power amplifier with low THD (0.08%) and high PSRR (77dB/at 217Hz).

· Review industry technical standards, plan and apply for national research projects, conduct market research and formulate new product development tasks.

· Manage and cultivate scientific and technological teams, guide innovation and patented inventions.

Semiconductor Processing Line of HUST Wuhan, China 430***-**** to 2000 Engineer

· Algorithm design for the arc in layout for power transistor; Design of VDMOS power transistor product; ASIC TX9902 (FPGA) optic communication system; Greenhouse Environment control system; Micro-crystal silicon pressure sensor; Polymer capacity humidity sensor; MEMS optic mirror; Design of Automobile Generator Voltage Electronic Regulator. Maintenance of semiconductor process equipment's.

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