Biography
Enrollment Date: 2012
Graduation Date：2015
Degree：M.S.
Defense Date：2015.06.03
Advisors：Liji Wu
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：Design and Implementation of The key IP core In battery-less Automotive Tire Pressure Monitoring System on Chip
Abstract:
Tire pressure monitoring system (TPMS) has become the third automobile system safety of legislation after the antilock brake system (ABS) and the airbag system. Currently on the market are a battery program, without battery tire pressure monitoring system can monitor the higher frequency and solve the environmental pollution problems caused by the battery. Currently on the market always are a battery program, the battery-less tire pressure monitoring system can monitor the higher frequency and solve the environmental pollution problems caused by the battery.For the battery-less tire pressure monitoring system, low-power design and wireless power receiving will be need. This paper consists of two parts. The first is the chip of the wireless energy transmission system, which has been taped out. The second part is to design and implement a low power EEPROM .In the design of battery-less tire pressure monitoring energy transmission system, the main target is to maximize the transmission efficiency at 13.56MHz with the corresponding matching network. The CMOS rectifier outputs a DC voltage with large ripple, which needs bandgap and linear regulator implement for a stable DC voltage, At the same time, to reduce power dissipation of the energy transmission system and improve the response speed and stability, the enable starting circuit is designed. Finally, the whole energy transmission system can achieve a stable output DC voltage of 3.3V, with a the minimum temperature coefficient of 1ppm, PSRR -70dB and -46dB at low frequency and 13.56MHz, respectively the power consumption in the steady state is only 47.2μA.The second part completes the design and implementation of a 64K bits EEPROM. The first step is to design the simulation model according to the process parameters, the read/write/erase operations of the EEPROM are simulated based on the model. The high voltage generator is designed, and the read-out circuit has adopted a low power design. The power consumption decreased by 56%, and the test result shows that the read operation is stable in the -40 degrees to 125 degrees and the typical value of read current is 1.3mA.The design and research of all the above are implemented in ASMC 0.35μm EEPROM automotive electronics process. The test of EEPROM has completed, and the battery-less energy recovery circuit has been taped out.