A 900MHz RFID reader chip with RC calibration

An RFID scanner chip targeted to operation frequency range of 860MHz to 960MHz is designed and fabricated. To reduce chip performance degradation due to process and temperature variation, resistor and capacitor calibration is adopted. Resistor calibration output codes are used to adjust main circuit blocks' biasing current. Capacitor calibration output codes are used to fine tune filter operating range and DAC conversion accuracy. The reader is implemented with a 90nm standard CMOS process and has a chip area around 3.1mm × 3.3mm. The chip is packaged with QFN48 and mounted on PCB. The proposed RFID reader consumes around 90mW power, which is possible to be integrated on a mobile phone or for other applications.