An ultra compact CMOS transceiver for HF multi-standard RFID reader

An ultra compact CMOS transceiver for HF multi-standard RFID application is proposed. For supporting multi-standard, two structures are adopted in a transmitter: ASK modulator with various modulation indexes and power control circuit which can control the recognition range between the reader and the tag. A receiver consists of a half-wave rectifier, an ASK demodulator using a supply-independent biasing circuit, and an adjustable Schmitt trigger. The designed transceiver is fabricated using TSMC 0.18 ¿m CMOS process. Through the simulation, the designed transceiver system can be operated in multiple standard conditions.