A fully integrated HF multi-standard RFID transceiver for compact mobile terminals

A fully integrated HF multi-standard RFID transceiver for compact mobile terminals is proposed. Considerations for multi-standard are concerned in each part of the proposed transceiver and all of them are implemented as digitally-controlled components. A transmitter controls its modulation index with a mode selector and its emitting power to tags with a power controller, thus covering various standards and recognition ranges. A receiver has a compact size as it excludes capacitors. In a receiver, an ASK demodulator controls its reference level of modulation by switching a resistor, and an adaptable Schmitt trigger alters its hysteresis range by switching additional transistors. The proposed transceiver is implemented in a TSMC 0.18 um CMOS technology. Measurement results of the transceiver and communication test between a reader with the transceiver and tags verify abilities of the proposed transceiver for multi-standard.