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This paper presents a fully integrated carrier clock recovery circuit for a mobile payment application. The architecture is based on a sampling-detection module and a charge pump phase locked loop.Compared with clock recovery in conventional 13.56 MHz transponders,this circuit can recover a high-precision consecutive carrier clock from the on/off keying(OOK) signal sent by interrogators.Fabricated by a SMIC 0.18-μm EEPROM CMOS process,this chip works from a single power supply as low as 1.5 V.Measurement results show that this circuit provides 0.34%frequency deviation and 8 mV sensitivity.
The paper presents a fully integrated carrier clock recovery circuit for a mobile payment application. The architecture is based on a sampling-detection module and a charge pump phase locked loop. Compared with clock recovery in conventional 13.56 MHz transponders, this circuit can recover a high -precision consecutive carrier clock from the on / off keying (OOK) signal sent by interrogators. Fabricated by a SMIC 0.18-μm EEPROM CMOS process, this chip works from a single power supply as low as 1.5 V. Measurement results show that this circuit provides 0.34% frequency deviation and 8 mV sensitivity.