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۱Low Cost and Precise Localization in a Remote–Powered Wireless Sensor and Identification System
نویسنده(ها): ،
اطلاعات انتشار: نوزدهمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۵
A low cost and precise localization system based on a remote–powered UWB–RFID tag is presented for wireless identification, sensing, positioning and tracking. Our contribution is to utilize the Impulse Radio Ultra wideband (IR–UWB) communication in a RFID system. Such as conventional RFIDs, a tag captures energy from the received RF signal transmitted by a reader which also carries data and clock. However, instead of backscattering, an Impulse–UWB transmitter is used. By a low power design operation distance of 13.9 meters is achieved. A network consist of several readers provide power and retrieve data from the tags in a wide area. Due to the fine time resolution of the ultra–short pulse in IR–UWB, the UWB receiver in the readers are able to accurately approximate the time of arrival of the signal and based on the time–difference–of–arrival algorithm the position of the tag can be estimated precisely. In the line–of–sight scenario by a two–step acquisition system, ±16.8cm accuracy can be achieved. By a new communication protocol proposed based on slotted–ALOHA anti–collision algorithm, 2000 tags per second can be read. The tag circuitry is designed and implemented in CMOS 180nm technology in a single chip solution.<\div>

۲A Subthreshold 8–bit 78.4nw 17.8 kS\s 0.18um SAR ADC for RFID Sensing applications
نویسنده(ها): ، ،
اطلاعات انتشار: نوزدهمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۵
In this paper an ultra low power SAR ADC for RFID application is presented. Several techniques are used to further reduce the power consumption and relatively elevate the speed of the ADC. These techniques include a low power comparator with no static current, a dual–stage (Resistor–string \ capacitive dividing) architecture as digital–to–analog converter (DAC) and using subthreshold design with the aid of low supply voltage of 0.7v for DAC and 0.5v for SAR block and Pulse Generator Circuit (PGC). In this DAC architecture fine search will be performed by only two C and 15C capacitors which reduce the silicon area significantly. A new FOM is also proposed for better verification of ADCs with power in μW and nW range. The circuit designed in 0.18um CMOS technology and post layout simulations show that the 8–bit core ADC, consumes almost 78.4nW at 17.8kS\s speed and the PGC block which is designed in subthreshold region consumes 84.1nW. The results show that the proposed ADC has higher speed with almost the same power consumption in comparison with its charge redistribution counterparts.<\div>

۳A Subthreshold Ultra Low Power 22fJ\conversion Flash ADC for RFID Sensing Applications
اطلاعات انتشار: نوزدهمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۴
In this paper an ultra low power Flash ADC for RFID application is presented. Several techniques are used to further reduce the power consumption and relatively elevate the speed of the ADC. These techniques include a low power Track–and– Latch comparator with no static current, large resisters in theresister string, an optimum encoder with only 2 stages using subthreshold design with the aid of low supply voltage of 0.7v for resister string and 0.5v for all logic blocks. In this ADC by absolute approximation the occupied area is equal with area of 16 resisters in the string. The circuit designed in 0.18μm CMOS technology and simulations show that the 4–bit ADC consumes almost 14.5μW at 40MS\s and 93.8nW at 0.1MS\s; however, it minimally dissipates only 22fJ per each conversion step. The results show that the proposed ADC could seriously compete with other low power ADCs in RFID sensing applications such as SAR ADCs<\div>
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