• Lead the design of 1.0V, 1.2V and 1.8V electrostatic discharge(ESD) clamps for state-of-the-art technology node• Performed and documented simulations with ESD accurate models for multiple process nodes• Evaluated and updated charged device model (CDM) spice simulation setup for ESD cells to coincide with TSMC’s recommendation• Performed capacitance extraction for ESD cells, including individual P-cell and N-cell capacitance contribution. Results gave the design team a better approach for the next design• Automated data extraction of simulation results with Python and Perl scripts• Started to create a SQL database with Python to store and sort CDM measurement data accessible to various teams

• Improved and verified the design of multiple power converters: 180W (60V to 5V) buck converter, 60WUSB-C buck converter, 15W USB-A buck converter, and a 2W LCD backlight boost converter• Supported in the design of a complex start-up circuit in the battery management system board andverified the design with various test-cases in SPICE simulations• Identified and fixed various system/board-level issues which caused performance issues; such as excessive noise readings on ADCs due to crosstalk from memory clock onto data lines• Created and performed board-level and system-level bring-up/testing procedure document for prototype units and long term reliability testing units• Supported supply-chain team to find alternate vendors and firmware team with hardware repairs

• Resonant dc/dc converter design (30 kW) at 100 kHz, working with SiC MOSFET at 1 kV DC-Link Voltage.• Resonant tank design including: Series inductor design, series capacitor design and transformer design• Control architecture for switching operation and optimal dead time• SiC MOSFET health monitoring

• Analyzed the package effects of CDM peak current for ESD protection purpose• Created models and traces of packages in a field induced CDM tester in Q3D/HFSS to extract capacitor matrices and S-parameters used in Cadence Spice simulations to match measurement data whichpromoted design optimizations• Developed a TCL script which performed Boolean operations on package layers which allowed the estimation of capacitance using parallel-plate analysis

Power Electronics Department at Corporate of Technology Siemens• Analyzed single/three-phase half-bridge and NPC inverters through theoretical calculation and simulation results from Simulink• Tested efficiency of GaN inverters with different DC-link voltage with varying switching frequency and load• Designed PWM offset waveforms which allowed zero or reduced midpoint current in a three-phase, three level NPC topology, thereby reducing the required capacitors at the DC-link.

• Worked on a charging circuit; a circuit containing a switching Li-Ion battery charger, stand-alone fuel gauge and a boost converter for phone batteries• Tested and analyzed on three early prototypes PCBs of the circuit for their functionality and power efficiency with multiple charge and discharges of batteries• Located and fixed a fatal problem of which the battery charger would involuntarily go on and off• Revised a new version for the circuit with a different thermistor and reduced the charging current to avoid overheating• Programmed in C/C++ through mbed compiler to establish a 1-Wire connection among multiple fuel gauge with a stm32 multiprocessor• Worked on test fixtures using Arduinos of another circuit for the manufacturing lines• Outline and planned with my co-worker of the necessary testing points of a circuit• Soldered a few prototype circuits (on top of the Arduino) that were immediately shipped and used in China• Designed, printed and built multiple PCBs that rearranged JTAG and I2C pins to a 9-pin• Improved the time and effort to update the handsets significantly and distributed among other departments

Supported electronics engineering department• Prepared electrical technical documents and other assistance work• Assisted co-workers in planning automation lines, and suggestions in robots’ operationsWorked with the quality control team• Travelled with the department to on-site spectating at (i.e. Volkswagen production) to evaluate fixtures and equipment used in production

Planned, designed, and built a circuit that included a clock, a counter, and an op-amp as a day counting sensors• Developed ideas and designed the circuit and verified on Spice; built and soldered the circuit on strip-boards• Used an astable multi-vibrator to produce a clock signal; used NAND/NOR logic gates to create a 4-bit counter and an op-amp circuit to amplify the signal from a photo sensor