Selected Projects
Corporation Projects
Corporation Name: Synopsys, Inc. Shanghai Site. (Summer Internship)
Goal: HSPICE is one of the flagship products at Synopsys. This project in 2015 was to refactor parser codes for three input commands (.set_sample_time, .dout, and .store) in HSPICE from Fortran to C++. This work was awarded as one of the best internship projects at Synopsys, China in 2015. I was invited to be present the project on Synopsys R&D Demo Day. This project in 2014 was to gather feature information from the quality assurance (QA) system to accelerate the test procedure by providing problem-specific test cases in every regression test. [Slides 2015] [Slides 2014]
- Refactored 3 commond input routines in HSPICE from Fortran to C++.
- Proposed the design methodology for future parser refactoring work and related software architecture.
- Reconstructed the simulation engine for transfer function simulation.
- Built a Perl script to gather information for database construction from 20,586 test netlists in the quality assurance (QA) system.
- Detected and fixed 11 bugs in HSPICE and HSP_PACK2GO, including several command malfunctions, file path problems, etc.
HSPICE top-level procedure for parser.
Photo taken with my mentor.
Corporation Name: TE Connectivity Ltd. (College-Industry Cooperation)
Advisor: Prof. Guoyong Shi & Prof. Qin Wang, Shanghai Jiao Tong University
Mentor: Mr. Taichu Dai & Mr. Hongye Xia, TE Connectivity Ltd.
Goal: Build a SPICE model for Polymer Positive Temperature Coefficient (PPTC) resistor considering current limit and time to trip variation with temperature for PSPICE simulation. [PDF]
- Designed a macro model for a PPTC device by taking into account three factors: temperature, current and time.
- Proposed parameter extraction methods to obtain model data for a specific device.
- Experimented the proposed model in both transient and temperature sweep simulation.
Fundamental principle of PPTC.
Proposed behavior model for PPTC.
Course Projects
Course: Optimal Estimation and System Modeling (Master)
Lecturer: Prof. Xiaomin Wang
Goal: The Kalman filter and multisensor data fusion play a significant role in parameter estimation in engineering. This project was to develop a vivid and interactive Graphical User Interface (GUI) for engineers to observe the experimental results of Kalman filter and the effect of data fusion for multiple sensors. [PDF] (Chinese Version)
- Developed a MATLAB GUI for parameter estimation.
- Realized the Kalman filter algorithm and data fusion algorithm for multiple sensors with different weighting methods.
- Provided functions for system's controllability and observability verification.
- Checked the validity of all input data for software robustness.
GUI for Kalman filter & data fusion.
Data fusion results.
Course: Circuit Design for Biomedical Implants (Master)
Lecturer: Prof. Guoxing Wang
Goal: Due to the straightforward mechanism, low power consumption, and fairly fast sampling rate, Successive Approximation Register (SAR) ADC has become one of the most popular ADC research topics in recent years. This project was to figure out the power consumption difference for three types of switching sequences in DAC: common voltage down switching sequence, common voltage back switching sequence, and common voltage fixed switching sequence. [PDF] (Chinese Version)
- Built an analytic model for SAR ADC in C++ to simulate its sampling behavior.
- Realized all the three switching sequences and the corresponding power conusmption model in C++ to estimate the power consumption of SAR ADC.
DAC structure for SAR ADC.
Power consumption comparison for different switching methods.
Course: Advanced Topics on Analog Mixed-Mode Signal Circuit Design (Bachelor)
Lecturer: Prof. Mohamad Sawan
Goal: Bio-medical electronics have made great progress in the past decade. Data converter plays an important role in the whole system, which stands for the bridge between analog and digital domain. In this work, a discrete-time sigma-delta modulator was presented with low power consumption and sufficient resolution in purpose of ECG signal sampling for pacemaker application. [PDF]
- Designed a bulk-driven fully differential operational amplifier, working under 1.0V power supply and 245nA current, with an open loop gain of 73dB and a GBW of 226.6kHz.
- Built a first-order Sigma-Delta Modulator (SDM) with an OSR of 20 and an SNR of 22.5dB, integrated a low power track and latch comparator with 39nA current.
Bulk-driven OTA design.
Power spectral density (PSD) for the system.
Course: Computer Organization and Embedded System (Bachelor)
Lecturer: Prof. Jiang Jiang
Goal: Build a processor using MIPS instruction set with a 5-stage pipeline architecture in Verilog considering branch prediction. [PDF] (Chinese Version)
- Designed the top level architecture and assigned related works to group members.
- Programmed the 'hazard detection', 'register', 'ALU', 'control', 'forwarding', 'sign extended' block in the system.
- Provided the testbench and verified the whole system.
MIPS Architecture.
MIPS Instruction Set.