Patent ID: 9641364
Date: 2017-05-02
CPC Classifications: H04B,H04L,H04W

Claim:
1. An apparatus comprising: an antenna circuit configured and arranged to provide a signal having a waveform; a rectifier circuit having at least four transistors coupled together and configured to form an active full-bridge rectifier having nodes coupled to the antenna circuit, each of the at least four transistors having a control electrode; and a modulator circuit coupled to the control electrodes of the at least four transistors of the active full-bridge rectifier, the modulator circuit configured and arranged to control an active switching function for the at least four transistors, wherein one or more of the at least four transistors is disabled for a number of cycles of the signal during the active switching function, wherein the number of cycles is greater than one and is for setting an impedance of the rectifier circuit and modulating an amplitude of the signal.