Reconfigurable CMOS RF energy harvesting system

Abstract

The invention discloses a reconfigurable CMOS RF energy harvesting system, which comprises a low-power branch circuit, a high-power branch circuit, and a control circuit, wherein the low-power branchcircuit is used for converting lower-power RF energy into DC energy; the high-power branch circuit is used for converting high-power RF energy into DC energy, and comprises a rectifier structure and atunable impedance matching network; the rectifier structure comprises a plurality of rectifier units capable of performing series and parallel connection switching; the high-power branch circuit canbe configured with different tunable impedance matching networks and rectifier structures according to RF energy with different input powers, and converts the RF energy with different input powers into DC energy maximally; and the control circuit automatically controls the switching of the low-power branch circuit and the high-power branch circuit according to the RF energy with different input powers, and controls the configuration of the tunable impedance matching network and the rectifier structure in the high-power branch circuit. The reconfigurable CMOS RF energy harvesting system realizes wide-dynamic-range and high-efficiency energy harvesting of the RF energy, and can effectively improve the sensitivity of energy harvesting.

Description

technical field [0001] The disclosure belongs to the field of radio frequency integrated circuit design, and relates to a reconfigurable CMOS radio frequency energy collection system. Background technique [0002] In recent years, wireless sensor networks (WSNs) have been widely used. Wireless sensor nodes not only require smaller size and lower power consumption, but also consider that they may be used in harsh natural environments or implanted medical devices, where battery replacement and wired charging cannot be performed, which requires wireless Sensor nodes should also have strong self-power supply capability. RF energy harvesting technology is currently the preferred solution to the energy-constrained problem in WSN, that is, by capturing the weak RF energy in the surrounding environment and converting it into electrical energy, it provides the power supply voltage required for the operation of low-power sensor nodes. [0003] Although the RF energy harvesting techn...

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Problems solved by technology

[0003] Although the RF energy harvesting technology has a good application prospect, it also faces many challenges: First, the available RF signal power in the environment is very weak, only in the order of μW. The required DC voltage, the RF energy harvesting system must have high sensitivity and high efficiency. In order to improve the system sensitivity, the turn-on voltage of the rectifier should be reduced; secondly, the RF input power of the RF energy harvesting system will change unpredictablely at any time. These changes Will indirectly affect the energy conversion efficiency of the system

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