Patent ID: 8319611
Filing Date: 2012-11-27
Classification: G06K,H04B,H04Q

Abstract:
1. An ID tag that converts radio power received from a reader/writer into operating power and performs back scattering communication to transmit information to the reader/writer, the ID tag comprising: an antenna for transmitting and receiving a radio signal to/from the reader/writer; a power supply that is coupled to the antenna and generates a supply voltage (VDD); an internal circuit to which the supply voltage is supplied; and a transceiver circuit that is coupled to the antenna in parallel with the power supply, wherein the transceiver circuit includes a boost circuit for boosting the radio signal from the reader/writer received by the antenna; a rectifying circuit for detecting an envelope of a boosted signal outputted from the boost circuit; a switch for back scattering that is coupled between an output terminal of the circuit and a reference potential; a transmitting circuit for controlling operation of the switch for back scattering; and a receiving circuit for demodulating a detected signal outputted from the rectifying circuit.