Test Engineer

Sheldon Chen

Austin, TX ***** 408-***-****

**********@*****.*** www.linkedin.com/in/Sheldon-Chen-SC

PRODUCT TESTING ENGINEER

Accomplished and versatile engineer with experience in planning, executing, and monitoring new product engineering testing, while designing, developing, and implementing software solutions. Skilled at product testing and software development in Python and data auto processing.

Basic understanding of SerDes top level block diagram, ISI, jitters.

Familiar with equipment operation manually and automations with Python, such as various oscilloscopes, Keysight DC power supply, Keithley AC DC current source, Keysight bench digital multimeter, temperature chamber, Aardvark I2C/SPI Host Adapter, Devantech latching relay, Keysight DCA wide bandwidth oscilloscope, Anritsu pulse pattern generator and error detector, Keysight Vector Network Analyzer, Keysight RF switches, Spectrum Analyzer.

Intermediate level Python, beginning to Intermediate level C/C++/C#/GIT/Jenkins.

Detailed knowledge of IEEE802.3/OIF-CEI standards for transceiver compliance requirement.

Core Competencies include:

Transceiver Test Software Development Coding Automation

Testing Cross-Functional Collaboration Compliance

PROFESSIONAL EXPERIENCE

TDK InvenSense, CA November 2021 – April 2024

Test Engineer, Staff

Contributed to production test software development and test board circuits debugging of cutting-edge product Ultrasonic Distance Sensor, a system on chip real-time embedded system.

Assisted hardware engineer in debugging circuits of Ultrasonic Sensor embedded system.

oRead python code and test out functionality of relevant python code functions using hardware tools such as Saleae Logic Pro16 and high-speed oscilloscope Tektronix TBS2204B. Modify and add python functions as needed for new Ultrasonic Sensor product.

oTeamed up and took care of coding and debugging mode step control during board level debugging, while circuits expert checking into the hardware side.

Led on software side in delivering Python programs that

oUtilizes existing drivers to handle SPI communications among various on-board devices, including but not limited to STM32 Neucleo, Microchip microcontrollers, CMOS Switch, I/O expander, and other peripheral devices.

oCoded procedures according to OTP(One-Time-Programmable Memory) full map.

oMulti unit tests in parallel were achieved with both Multiprocessing and Multithreading applications in Python programming.

oIntegrated Keysight Function Generator control, and temperature oven control into test automations.

Further developed a pre-existed C#/Python/C++ integrated software programs for production hardware testing on embedded test boards, team worked with GIT and Jenkins on version control and code updates. Program top level is written in C#, sometimes call C++ DLL files to control some components on the board, it also uses Restful API to call test sequences and procedures written in Python.

Further developed a pre-existed C coded program to add new test for new product that is running on a Microchip micro controller controlled mother board and daughter board EVK, and within PuTTY environment.

Total experience with C#, C++, and C coding is about one year altogether.

SHELDON CHEN 408-***-**** **********@*****.*** PAGE TWO

Renesas Electronics Corporation, CA September 2020 – November 2021

Senior Application Engineer

Lead the testing automation within organization with Python language. Lead product’s DVT test planning, execution and data report for Transceiver TX and RX die product. Conduct comprehensive data analysis using Python tools in supporting to address customers’ technical questions.

Frequently use oscilloscope, DC power supply, bench digital multimeter, AC DC current source, temperature chamber, Keysight Vector Network Analyzer, RF connections, I2C/SPI Host Adapter, and Devantech latching relay modul, to conduct tests manually and set up test station.

Built from ground up an automation test system for all testing needs within organizations using Python coding, including fundamental coding structure, instrument drivers in Python for all peripheral equipment and devices needed, building new coding libraries, and post-test data processing automations.

Lead technicians to run automation test programs to collect various tests data.

Automated batch processing of data analysis, charting and reporting using various Python tools.

Comprehensive data trending and formula fitting and generation with Python data science techniques and beginning techniques of machine learning.

Helped adding/modifying features for production test software in Visual Basic coding.

Personal project: Installed Ubuntu Linux operating system to PC. Created / manipulated various folders and files in Linux commands for different tasks. Learned Linux commands from online course and open sources.

Finisar/II-VI Incorporated, CA January 2015 – January 2020

Senior R&D Test Engineer

Researched compliance standards and relevant testing techniques, designed test methods, and developed the needed test programs with Python coding. Carried out and completed the tests and characterization of 100G/400G products (QSFP28, OSFP, SFP) for ethernet, datacenter interconnections, including both high speed testing and low speed timing test.

Frequently use Tektronix oscilloscope, DC power supply, Keysight DCA wide bandwidth oscilloscope, Anritsu pulse pattern generator and error detector and RF switches to conduct tests manually.

Developed compliance testing for NPI, and customer requests.

Provided important feedback to aid the design and business decision under dynamic environment, such as CTLE optimization, pre/post mapping, product performance under various channel losses.

Performed product tests, results analysis, problem identification, conclusion and final report.

Developed and implemented Python coding for 2x200G OSFP transceivers TP1 to TP4 test automations, potentially saving massive engineering hours in conducting highly complicated transceiver testing.

Created and implemented Python coding for automations of sensitivity test data processing and charting report, which saved massive engineering hours in data processing, data organizing, and chart reporting.

Earned exceptional reviews from VP and BU GM after proposed test plan and executed two of company's most strategic important new product's transceiver from TP1 to TP4 compliance verification tests following IEEE, OIF CEI, and special customer standards, which company has counted on to deliver new products to market on time. This became part of the contributions that increased company’s revenue $30M per quarter.

Developed Python program for test automation and data analysis automation, by using Pandas, NumPy and Matplotlib.

SHELDON CHEN 408-***-**** **********@*****.*** PAGE THREE

Intel, Santa Clara, CA December 2013 – December 2014

Transceivers Test Engineer

Successfully delivered EEPROM content check automation program using Visual Basic API, which turned into part of the customer sample flow as a gate.

Achieved module level test summary report automation through JMP scripting language.

Built test station and completed initial repeatability study.

Developed high-speed optical transceiver module products incoming/outgoing screening procedures and published the procedures, also set up test station for high-speed TX eye diagram and RIN test procedure.

CoAdna, Sunnyvale, CA July 2008 – August 2013

Senior Quality & Reliability Engineer

Troubleshot customer returned units, including reviewing and analyzing data of Wavelength Selective Switch (WSS) for IL, PDL, Frequency Shift, Extinction Ratio, IL Uniformity, and Cross Talk, IL accuracy.

Assist top management team to finalize FA reports to customers.

Lead test station’s Gauge Repeatability & Reproducibility.

Conducted numerous continuous quality improvement activities all through products life cycle, and key quality issues that impact yield, delivery and RMA most.

Intel, Fremont, CA May 2007 – July 2008

Senior Quality & Reliability Engineer

Conducted SFP eye diagram testing, including Extinction Ratio, Average Optical Power, Optical Modulation Amplitude, Stressed Receiver Sensitivity, and others.

Set up and test equipment and maintain test systems, to test SFP product eye diagram and extinction ratio in 10Gbps range.

Modified LabVIEW program for testing and set up test station.

ADDITIONAL PROFESSIONAL EXPERIENCE

Triformix, Quality Engineer

JDS Uniphase, R&D and Manufacturing Engineer

EDUCATION

Master of Science (MS), Physics & Engineering Science (Dual Masters),

University of South Florida, Tampa, FL

Bachelor of Science (BS), Lasers

Tianjin University, China

CERTIFICATIONS

Using Databases with Python, University of Michigan, MI, April 2020

Using Python to Access Web Data, University of Michigan, MI, April 2020

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