Abstract
A high-efficiency wireless power transfer-receiver IC that can operate at 2.4 GHz has been proposed. The IC consists of a matching network, rectifier, and DC-DC converter. The rectifier based on the Dickson charge pump topology is designed to have high efficiency by optimizing the number of stages and matching networks. In the proposed IC, a high-efficiency CMOS step-up/step-down DC-DC converter that can operate over a wide input range is involved. The converter provides quadruple conversion ratios of 1/3, 1/2, 2/3, and 2/1, which are determined by the mode selector by sensing the input voltage level. The IC was implemented in a standard 28-nm CMOS process, and post-layout simulation results for the IC demonstrated that the rectifier operates at −8 dBm to 20 dBm and shows a maximum efficiency of 66 % for an input power from −4 to 20 dBm. The DC-DC converter outputs a voltage of 1.6∼2.2 V for a wide input voltage range of 1.2∼5 V and shows a power conversion efficiency of up to 80 %. For the entire IC, the maximum efficiency is 50.8 % at an input power of 12 dBm.
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