Energy Scvenging For Mobile And Wireless Devices Using CMOS Rectifier Circuit

Tan, Chong Wei (2017) Energy Scvenging For Mobile And Wireless Devices Using CMOS Rectifier Circuit. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text Energy Scvenging For Mobile And Wireless Devices Using CMOS Rectifier Cirucit - Tan Chong Wei - 24 Pages.pdf - Submitted Version Download (769kB)

Abstract

The world is surrounded with billions of radio devices, therefore RF energy is easy available from the ambient environment. The RF energy scavenging system can be realised by converting the RF source to stable DC output where this could be done by a rectifier. However, most of the rectifier only able to achieve low power conversion efficiency due to high threshold voltage drops and low input sensitivity. In this project, a CMOS rectifier is designed in 130nm technology. It is designed for high sensitivity at input power of -20dBm and operating in 2.45 GHz. This project covered complete flow of IC design with Cadence Virtuoso custom design tools from schematic to layout. In the schematic design a cross-coupled rectifier has been designed. This topology has been proved that have reduce the threshold voltage to approximately 50% as compared to the conventional rectifier. The rectifier is cascaded into 5 stages so that to increase the output voltage to a usable level. Supporting circuit such as matching circuit has been constructed for the rectifier.so that it could receive RF energy from a RF port. Several parametric studies have been carried in this project, the parameter such as matching circuit component, transistor size and load resistor has been defined. These parameters provide the optimum performance of the rectifier. To ensure the rectifier could work properly, numerous simulation and data analysis is performed in this project. Transient response of the rectifier have been plotted, the rectifier shows a linear and stable output voltage and current. Next, the load capability of the rectifier has been determine by sourcing the current from the rectifier. The rectifier could draw out 1μA current at -10dBm input. The output current increased to 10μA as the input power increased to 0dBm. After that, a steady state analysis have been carried out to determine the steady state output voltage and output current. The rectifier have achieved output voltage at 1.742V and output current at 1.34μA. Besides, the rectifier has also achieved high power conversion efficiency at 68.26% at -20dBm. It has also achieved a high voltage gain at 88.91 at -20dBm too. Furthermore, the layout of the rectifier have been constructed, physical verification have been carried out.

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