Current Issue : January - March Volume : 2015 Issue Number : 1 Articles : 5 Articles
Implantable medical devices provide therapy to treat numerous health conditions as well as monitoring and diagnosis. Over\nthe years, the development of these devices has seen remarkable progress thanks to tremendous advances in microelectronics,\nelectrode technology, packaging and signal processing techniques. Many of today�s implantable devices use wireless technology to\nsupply power and provide communication. There are many challenges when creating an implantable device. Issues such as reliable\nand fast bidirectional data communication, efficient power delivery to the implantable circuits, low noise and low power for the\nrecording part of the system, and delivery of safe stimulation to avoid tissue and electrode damage are some of the challenges faced\nby the microelectronics circuit designer. This paper provides a review of advances in microelectronics over the last decade or so\nfor implantable medical devices and systems. The focus is on neural recording and stimulation circuits suitable for fabrication in\nmodern silicon process technologies and biotelemetry methods for power and data transfer, with particular emphasis on methods\nemploying radio frequency inductive coupling.The paper concludes by highlighting some of the issues that will drive future research\nin the field....
A hierarchical control structure is proposed for hybrid energy systems (HES) which consist of wind energy system (WES) and\nenergy storage system (ESS). The proposed multilevel control structure consists of four blocks: reference generation and mode\nselect, power balancing, control algorithms, and switching control blocks. A high performance power management strategy is used\nfor the system.Also, the proposed systemis analyzed as an active power filter (APF)with ability to control the voltage, to compensate\nthe harmonics, and to deliver active power.The HES is designed with parallel DC coupled structure. Simulation results are shown\nfor verification of the theoretical analysis....
Since Moore�s law driven scaling of planar MOSFETs faces formidable challenges in the nanometer regime, FinFETs and Trigate\nFETs have emerged as their successors. Owing to the presence of multiple (two/three) gates, FinFETs/Trigate FETs are able to\ntackle short-channel effects (SCEs) better than conventional planar MOSFETs at deeply scaled technology nodes and thus enable\ncontinued transistor scaling. In this paper, we review research on FinFETs from the bottom most device level to the topmost\narchitecture level. We survey different types of FinFETs, various possible FinFET asymmetries and their impact, and novel logiclevel\nand architecture-level tradeoffs offered by FinFETs. We also review analysis and optimization tools that are available for\ncharacterizing FinFET devices, circuits, and architectures....
In As/(In,Ga)Sb type-II strained layer superlattices (T2SLs) have made significant progress since they were first proposed as an\ninfrared (IR) sensing material more than three decades ago. Numerous theoretically predicted advantages that T2SL offers over\npresent-day detection technologies, heterojunction engineering capabilities, and technological preferences make T2SL technology\npromising candidate for the realization of high performance IR imagers. Despite concentrated efforts of many research groups, the\nT2SLs have not revealed full potential yet. This paper attempts to provide a comprehensive review of the current status of T2SL\ndetectors and discusses origins of T2SL device performance degradation, in particular, surface and bulk dark-current components.\nVarious approaches of dark current reduction with their pros and cons are presented....
LED is an emerging technology that has the potential to displace inefficient incandescent lamps and mercury-filled fluorescent lamps. The design of the power supplies that drive the LED systems is very crucial as high power quality has to be maintained. The single ended primary inductance converter (SEPIC) converter is used widely for LED applications as a single-stage power conversion is possible i.e. it is possible to achieve its output voltage lower or higher than the input voltage and also a high power quality can be achieved. In this paper, various SEPIC power factor correction converter topologies for LED applications are explored. A novel SEPIC PFC converter is also proposed which exhibits a better power factor than the conventional converters. The proposed converter works under Continuous conduction mode (CCM) to drive the LED Lamp. Power quality indices are evaluated to verify the performance of the system. Results are verified by simulation studies using MATLAB/simulink....
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