SYSTEMS AND METHODS USING LOAD MODULATION FOR WIRELESS COMMUNICATION

A wireless reader has a processor within an integrated circuit, and the processor is used to generate a primary signal to be wirelessly transmitted from an antenna of the wireless reader to a wireless tag. A transmit pin of the integrated circuit is coupled to the processor by a signal path in the integrated circuit. The transmit pin outputs the primary signal from the integrated circuit to the antenna for wireless transmission of the primary signal to the wireless tag. A sensor is configured to sense current or voltage variations of the primary signal at a point in the signal path between the processor and the transmit pin, and a signal extraction unit is configured to extract, based on the current or voltage variations, a data signal wirelessly transmitted by the wireless tag to the wireless reader via load modulation of the primary signal.