![]() ![]() To gain a perspective of practical implementation, we also explore various design issues. When input voltage increases to a level of more than 1 V, the Dickson voltage multiplier with ultra-low-power diodes maintains the highest efficiency, reaching around 80% in the wide input voltage range. We also found that the voltage multiplier with Schottky diodes, used in the Dickson topology, exhibits the lowest sensitivity. We observe that the voltage multiplier with cross-coupled configuration yields the best power conversion efficiency at an optimized input voltage however, it drops immediately after this voltage is reached. For a fair comparison between specifications of several state-of-the-art topologies, we have migrated and simulated some of them in one exemplar process technology under the same set of constraints. Since existing voltage multipliers are designed with various process technologies, a comparison among available devices in various topologies is difficult. The survey covers topologies of voltage multipliers, novel devices, and efficiency/voltage boosting techniques. This paper presents a comprehensive literature survey on the rectification and voltage multiplication of low-input power signals in the frequency range of 100 MH z-1 GH z in remotelypowered systems which require up to several hundred ?A current and operate with less than 3 V supply voltage. The answer to this problem involves implementation of a new class of power-sipping, voltage multiplying power management blocks, which have a wide variety of applications from implantable microelectronic devices (IMD) to internet of things (IoT) and radio-frequency identification (RFID). Passive (battery-less) wireless systems, operating in the high-frequency band, pose a challenge: generating sufficient amount of supply voltage from very low-input-power flow. Proper operation of active circuits in a wirelessly powered system requires both sufficient power flow and voltage. ![]() In this document, methods to reduce tag size, the performance optimization of the tag by using novel antenna matching techniques for increased operational bandwidth and gain/radiation pattern/radiation efficiency improvement are introduced for 13.56 MHz HF and 915 MHz UHF RFID tags.In addition, an evaluation of an active 915 MHz UHF RFID field study for container tracking at the port of Savannah, GA is also presented. A suitable antenna for these tags must have low cost, low profile and especially small size whereas the bandwidth requirement (few kilohertz to megahertz) is less critical. In these applications, a wireless communication link is provided between a remote transponder (antenna and integrated circuit (IC)) and an interrogator or reader. Radio Frequency IDentification (RFID) Tags have become quite widespread in many services in the industry such as access control, parcel and document tracking, distribution logistics, automotive systems, and livestock or pet tracking. ![]()
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