1,720,963 research outputs found
Ultra low-voltage analog circuits for UHF RFID devicesin 180 nm CMOS technology
Full text linkRadio-frequency identification by means of passive tags requires low-cost devices featuring extremely low power consumption for long reading distance and compatibility to small printed antennas. The paper describes the design and implementation of the key analog blocks in a RFID chip: power supply regulator, local oscillator and ASK demodulator. The proposed local oscillator exhibits a very low power consumption and achieves a frequency tolerance compatible with the requirements dictated by the ISO 18000-6 standards. In addition, an ultra-low power voltage reference and a regulator based on a zero-voltage threshold device are presented. These circuits are suitable to provide a regulated power supply to the local oscillator and to the core logic of the passive device. Measurements on a chip implemented in 0.18 μm digital CMOS technology validate the results obtained from simulations
CMOS power retriever for UHF RFID tags
No full textA power retrieving circuit for a UHF RFID passive tag is proposed. The circuit is implemented with a 0.18μ m standard digital technology, and allows the empowering of the tag at more than 5 m from a 500 mW ERP interrogator
A multistandard frequency synthesizer for 5-6 GHz WLAN transceivers in 0.35μm BiCMOS technology
No full textDC-DC CONVERTER FOR FUEL-CELLS AND PORTABLE DEVICES IN DIGITAL CMOS TECHNOLOGY
No full textThe manuscript discusses the design of an integrated DC-DC power converter in a digital 0.18 μm CMOS technology for fuel cells and portable applications. By means of a combined boost and switched-capacitor architecture and design optimization a suitable efficiency has been achieved without resorting to special process options and with a limited number of passive external components. The achieved results enable the implementation of a power-converter system for fuel-cell featuring low-cost and small size, as required by the market of portable device
Design of Fuel-Cell Powered DC-DC Converter for Portable Applications in Digital CMOS Technology
No full textA foreground Calibration Technique for an 8-b 2GS/s Flash ADC in 0.18-um CMOS technology
No full text
Design of a Low-Cost Passive UHF RFID tag in 0.18um CMOS technology
No full textThe work addresses the design of a passive UHF Radio-Frequency Identification (RFID) tag. In order to realize a product able to be competitive in the RFID expanding market, a cost reduction policy has been applied in the design: a general purpose digital technology has been employed, resorting to specific techniques in order to overcome the limitations due to the lack of process options. Such solutions are accurately described, and every block composing the transponder analog frontend is analyzed, highlighting advantages and disadvantages of the proposed architectures with respect to the ones present in literature. The circuits theory is validated through simulations and experimental data.Il lavoro di tesi è imperniato sul progetto di un tag passivo per l'Identificazione a Radio-Frequenza (RFID) operante nelle bande UHF. Per il progetto è stata applicata una politica di riduzione dei costi, così da proporre un prodotto in grado di essere competitivo nel fiorente mercato dell'RFID: è stata scelta una tecnologia digitale general-purpose, e specifiche tecniche di progettazione sono state utilizzate per superare le limitazioni dovute alla scarsità di opzioni di processo. Le soluzioni adottate sono descritte accuratamente, ed è riportata l'analisi di ogni singolo blocco componente il frontend analogico, evidenziando vantaggi e svantaggi delle architetture proposte rispetto a quelle presenti in letteratura. La validità della teoria alla base dei circuiti è stata verificata tramite simulazioni e dati sperimentali
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