Design Considerations for the Digital Core of a C1G2 RFID Tag

An EPC Class 1 Gen 2 (C1G2) RFID system is composed of a reader and one or several passive tags. Passive tags obtain the required energy from the radio frequency field emitted by the reader. The forward data link (reader to tag) is embedded in this radio frequency field. The backward data link (tag to reader) is achieved by means of backscattering. The RFID tag consists of several analog circuits and a digital core. The analog circuits perform tasks such as harvesting the energy from the electronic wave, supplying power, generating a clock signal and signal conditioning. The digital core of the tag performs data detection and implements the logical requirements of the standard.