Batteryless wireless sensor device with clock extraction from energy harvesting source and impedance modulated data transmission

A batteryless wireless sensor device comprising:

• an impedance matching network operably coupled to an antenna and configured to receive a radio frequency (RF) signal that is transmitted from another device, wherein the RF signal includes a frequency within a frequency band designated for unlicensed operation by the US Federal Communications Commission (FCC);
• a power rectifier operably coupled to the impedance matching network and configured to harvest energy from the RF signal and generate a DC signal based on the energy harvested from the RF signal, wherein the power rectifier including:
• an N-type metal-oxide-semiconductor field-effect transistor (MOSFET) (NMOS), an inductor, and a capacitor operably coupled to the impedance matching network and configured to operate cooperatively to rectify the RF signal and to harvest the energy from the RF signal in accordance with generating another DC signal;
• and
• a voltage regulator operably coupled to the inductor and the capacitor and configured to process the another DC signal to generate the DC signal based on the energy harvested from the RF signal;
• and
• a wireless sensor device operably coupled to the power rectifier and the impedance matching network, powered by the DC signal, and configured to:
• perform digital sampling of a sensor signal of a sensor thereby generating sensor data;
• and
• facilitate transmission of the sensor data to the another device by facilitating modulation of impedance of the impedance matching network to transmit the sensor data to the another device by facilitating reflection of energy of the RF signal that has been transmitted by the another device.