| Summary: | 碩士 === 國立勤益科技大學 === 電子工程系 === 101 === In a wireless sensor network (WSN), sensors are distributed in a field to monitor environmental variables such as temperature, sound, vibration, pressure, and so on. Then, these data are transmitted over the network to the base stations. WSNs require sensor nodes which must be small, with simple structure and low cost. It also needs long-distance communication technique to obtain a variety of information and to minimize the number of base stations. How to supply a continuous power to sensor nodes is a key issue of WSN design. Therefore, energy harvesting techniques become increasingly important in solving WSN power supply issue.
In the RF energy harvesting systems, rectifier plays the potential role to perform two major tasks including rectifying RF signal and boosting the rectified voltage. By using the charge pump is a very appropriate way to boost the rectified voltage. This thesis focuses on the voltage attenuation and dead zone problems of a traditional charge pump used in energy harvesting systems. The compensation is used to solve these problems, and balance between the compensation voltage and leakage current in design is also under consideration. The proposed new rectifier for RF energy harvesting system is designed by using TSMC 0.18μm CMOS 1P6M 1.8 &; 3.3V process. The input signal frequency is assumed as 900MHz. The experimental results show that the conversion efficiency can be up to 42.25% and the minimum incident power is -12.66dBm.
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