Projeto de um retificador por acoplamento cruzado para colheita de energia de RF em circuitos de ultra-baixa tensão

Abstract

This work presents the design of a cross-coupled voltage multiplier rectifier, using a 180 nm CMOS technology, as one of the radiofrequency energy harvesting blocks. It aims is to convert the RF input signal into ultra-low voltage power, achieving the high-est power conversion efficiency (PCE) to power low-power IoT devices. It also points out an overview of energy harvesting devices and low voltage rectifiers, presenting the most relevant references in the literature of recent years. To design the voltage rectifier circuit block, the basic architecture of an RF energy collector is demonstrated, which makes use of an antenna, an impedance matching network and a cross-coupled voltage multiplier rectifier. The concentration of this work occurs only in the rectifier block. The methodology is demonstrated aiming to maximize the output voltage through the sizing of transistors and capacitors for a load of 10 kΩ. As a result, this work presents the topology of a rectifier with only one multiplication stage, being capable and sufficient to provide an ultra-low voltage of 0.4 V, when fed with -14.13 dBm. Finally, its maximum PCE is obtained at 41.81%. Keywords: CMOS technology, Cross-Coupled Voltage Multiplier Rectifier, Internet Of Things, Energy Harvesting, Radio Frequency, Power Conversion Efficiency.