BLE protocol-based battery-free multi-mode transceiver

A BLE protocol-based battery-free multi-mode transceiver, comprising a wireless energy harvester module, a power management module, a transmitter, a receiver and a backscattering module, wherein the wireless energy harvester module is connected to the power management module, the power management module is connected to the transmitter and the receiver, and the transmitter is connected to the backscattering module;

• the wireless energy harvester module comprises an antenna, a matching/resonant network and a rectifier, wherein the antenna is connected to the matching/resonant network, the matching/resonant network is connected to the rectifier, and a continuous waveform signal transmitted by a Hub is rectified to a DC voltage VDC through the rectifier so as to supply power for the whole transceiver;
• the power management module comprises a bandgap reference, a low-dropout regulator L1 and a low-dropout regulator L2, wherein the rectifier is connected to the bandgap reference, the bandgap reference is respectively connected to the low-dropout regulator L1 and the low-dropout regulator L2, the low-dropout regulator L2 is connected to the transmitter, and the low-dropout regulator L1 is connected to the receiver;
• and the power management module provides required stable currents IREF and required voltages VDD for circuits;
• the transmitter modulates a baseband signal inputted by an external device into a Gaussian Frequency Shift Keying (GFSK) modulated Bluetooth intermediate frequency signal compatible to a BLE protocol, modulates a received continuous waveform signal by using a backscattering technology, backscatters digital information compatible to the BLE protocol, and transmits a Bluetooth radio frequency signal;
• the rectifier is connected to the receiver, and the receiver receives the Bluetooth radio frequency signal, detects a fluctuation in an output voltage signal VDC of the rectifier and amplifies the fluctuation, i.e., amplifying the Bluetooth intermediate frequency signal in an output of the rectifier, and then demodulates the Bluetooth intermediate frequency signal to a Bluetooth baseband signal;
• and
• the backscattering module uses a switching or varactor diode to further modulate the GFSK modulated Bluetooth intermediate frequency signal to a radio frequency and backscatter the GFSK modulated Bluetooth intermediate frequency signal.