A Reconfigurable Regulating Rectifier with a Maximum VCR of 3.66 for 402MHz Wireless Power Transfer System

In this paper, a 402 MHz reconfigurable regulating rectifier (R<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup>) with a wide input dynamic range has been designed for wireless power transfer (WPT) systems. The rectifier has a 6-stage cross-coupled (CC) rectifier driven by a differential RF input. With the assistance of the analog regulation circuit, the rectifier achieves a regulated 1.8V DC output voltage with a ripple factor of less than 0.07%. Moreover, a digital control logic is employed to modify the stages of the R<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> to balance the voltage conversion ratio (VCR) and power conversion efficiency (PCE) according to the input signal. The proposed R<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> can achieve a VCR of 3.66 at a load of 500 kΩ and a PCE of 60.1% at -11.3 dBm output power.