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A semi-digital phase-interpolator based CDR is implemented in 0.18μm CMOS. By employing a cascaded architecture, versatile CDR operation is achieved. The first-stage CDR provides fast acquisition even with large initial frequency difference, followed by the second-stage CDR to further improve the time margin for phase tracking. An adaptive algorithm is used to change the phase resolution of the second...
This paper presents a novel ASK demodulator for passive UHF RFID (radio frequency identification) tag, which can detect minimum 10% modulation index over a RF power range of 30 dB. Compared with conventional nonlinear voltage and linear current demodulations, the detection sensitivity over a wider range is increased by adopting an innovative divisional linear voltage demodulation with ultra low power...
This paper presents in details the architecture and most of RF front-end building blocks of a fully integrated passive radio frequency identification (RFID) transponder operating at UHF 902 MHz to 928 MHz. A novel architecture for the transponder IC and a new low power on-off keying (OOK) demodulator are proposed in this paper. For realizing the system, a low power CMOS full-wave rectifier achieving...
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