Biography
Enrollment Date: 2012
Graduation Date：2015
Degree：M.S.
Defense Date：2015.06.02
Advisors：Liji Wu Woogeun Rhee
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：Study and Design on ESD Protection Circuits for Automotive BCM SoC
Abstract:
Nowadays, cars are designed to be more smart, safe and environmental friendly. Behind them all, is the power of automotive electronics system and integrated circuit technology. In order to catch up with this trend, China's automobile industry must grasp those two key technologies.Car's operation environment is very complicated and rough, and car accident may cause great loss in people's life and property. Thus, the demand for reliability of automotive IC is usually higher than normal commercial chips. ESD reliability is one of the most important considerations. This thesis is focusing on ESD protection network and ESD devices. It proposed two kinds of on-chip ESD protection network solutions to improve automotive BCM SoC's reliability.On system level, a power line concentrated ESD distribution network and a ground line concentrated ESD distribution network are proposed. With those two networks, all ESD events can be distributed through two ESD devices.On device level, SCR is the most efficient device. Base on TCAD simulation, this thesis studied three kinds of SCR's operation mechanisms. Analyzed and summarized the relationship between SCR's electrical parameter and lateral size. In particular, the electrical parameter vs temperature relationship is studied under the automotive IC’s work condition of -40~125℃. The test results of the actual SCR devices in GSMC 0.13μm eFlash technology have proved the correctness of those analysis and TCAD simulation results.On circuit level, this thesis has proposed a design of GPIO for BCM SoC. By taking grouping switch and time-delay switch strategies, this GPIO achieved the speed configuration function, and also limited the output peak current to an acceptable value. The simulation results show that, in the worst case, this GPIO can drive 25pF capacitance within 4ns transmission delay, and it’s peak current has been limited under 100mA.