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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. 相似文献
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This paper describes a multimode high-resolution digital pulse width modulator.This modulator,based on a novel hybrid structure,not only has a programmable duty cycle but also realizes phase modulation.A 576 ps pulse resolution is achieved based on a 13.56 MHz switching frequency for near field communication.Fabricated in a SMIC 0.18-μm EEPROM CMOS process,the total area of modulator is only 130×180μm~2.Measurement results validate the multi-mode modulation function and high pulse resolution. 相似文献
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