Ultra-wideband (UWB) technology enables high data-rate short-range communica- tion, in excess of hundredmegabit-per-secondsand up to multi-gigabit-per-seconds, over a wide spectrum of frequencies, while keeping power consumption at low lev- els. This low power operation results in a less-interfering co-existence with other existed communication technologies (e.g., UNII bands). In addition to carrying a huge amount of data over a distance of up to 230 feet at very low power (less than 0.5mW), the UWB signal has the ability to penetrate through the doors and other obstacles that tend to reflect signals at more limited bandwidths and higher power densities.
标签： Silicon-Based Front-Ends RF
上传时间： 2020-06-01
上传用户：shancjb
An acronym for Multiple-In, Multiple-Out, MIMO communication sends the same data as several signals simultaneously through multiple antennas, while still utilizing a single radio channel. This is a form of antenna diversity, which uses multiple antennas to improve signal quality and strength of an RF link. The data is split into multiple data streams at the transmission point and recombined on the receive side by another MIMO radio configured with the same number of antennas. The receiver is designed to take into account the slight time difference between receptions of each signal, any additional noise or interference, and even lost signals.
标签： Understanding_the_Basics_of_MIMO
上传时间： 2020-06-01
上传用户：shancjb
Visible light communications (VLC) is the name given to an optical wireless communication system that carries information by modulating light in the visible spectrum (400–700 nm) that is principally used for illumination [1–3]. The communications signal is encoded on top of the illumination light. Interest in VLC has grown rapidly with the growth of high power light emitting diodes (LEDs) in the visible spectrum. The motivation to use the illumination light for communication is to save energy by exploiting the illumination to carry information and, at the same time, to use technology that is “green” in comparison to radio frequency (RF) technology, while using the existing infrastructure of the lighting system.
标签： Communication Visible Light
上传时间： 2020-06-01
上传用户：shancjb
This book is concerned with integrated circuits and systems for wireless and mobile communications. Circuit techniques and implementation of reconfigurable low-voltage and low-power single-chip CMOS transceivers for multiband and multi- mode universal wireless communications are the focus of the book. Applications encompass both long-range mobile cellular communications (GSM and UMTS) and short-range wireless LANs (IEEE802.11 and Bluetooth). Recent advances in research into transceiver architecture, RF frontend, analogue baseband, RF CAD and automatic testing are reported.
标签： Communication Wireless Circuits Systems and
上传时间： 2020-06-01
上传用户：shancjb
This paper reviews key factors to practical ESD protection design for RF and analog/mixed-signal (AMS) ICs, including general challenges emerging, ESD-RFIC interactions, RF ESD design optimization and prediction, RF ESD design characterization, ESD-RFIC co-design technique, etc. Practical design examples are discussed. It means to provide a systematic and practical design flow for whole-chip ESD protection design optimization and prediction for RF/AMS ICs to ensure 1 st Si design success.
标签： ESD_protection_for_RF_and_AMS_ICs
上传时间： 2020-06-05
上传用户：shancjb
Micro-Electro-Mechanical Systems (MEMS) are miniature systems composed ofintegratedelectricalandmechanicalpartstosenseand/orcontrolthingsonaµmscale. The concept of MEMS is attributed to Richard Feynman’s famous talk on December 29th, 1959 [2,3]. Dr. Feynman foresaw many aspects of future MEMS development with his insight in microphysics. In particular, material properties in the µm scale are differentfrombulkpropertiesandthescalingdownofintegratedcircuits(IC)fabrication technology has been a major driving force of MEMS development.
标签： Performance High MEMS RF
上传时间： 2020-06-06
上传用户：shancjb
Over many years, RF-MEMS have been a hot topic in research at the technology and device level. In particular, various kinds of mechanical Si-MEMS resonators and piezoelectric BAW (bulk acoustic wave) resonators have been developed. The BAW technology has made its way to commercial products for passive RF filters, in particular for duplexers in RF transceiver front ends for cellular communica- tions. Beyond their use in filters, micromachined resonators can also be used in conjunction with active devices in innovative circuits and architectures.
标签： MEMS-based Circuits Systems and
上传时间： 2020-06-06
上传用户：shancjb
GaN is an already well implanted semiconductor technology, widely diffused in the LED optoelectronics industry. For about 10 years, GaN devices have also been developed for RF wireless applications where they can replace Silicon transistors in some selected systems. That incursion in the RF field has open the door to the power switching capability in the lower frequency range and thus to the power electronic applications. Compared to Silicon, GaN exhibits largely better figures for most of the key specifications: Electric field, energy gap, electron mobility and melting point. Intrinsically, GaN could offer better performance than Silicon in terms of: breakdown voltage, switching frequency and Overall systems efficiency.
标签： GaN-on-Si Displace and SiC Si
上传时间： 2020-06-07
上传用户：shancjb
To a quantum mechanic the whole universe is one godawful big interacting wavefunction ? but to the rest of us, it’s a world full of separate and distinguishable objects that hurt us when we kick them. At a few months of age, human children recognize objects, expect them to be permanent and move continuously, and display surprise when they aren’t or don’t. We associate visual, tactile, and in some cases audible and olfactory sensations with identifiable physical things. We’re hardwired to understand our environment as being composed of separable things with specific properties and locations. We understand the world in terms of what was where when.
上传时间： 2020-06-08
上传用户：shancjb
高质量C++和C编程指南资料说明[摘要]每个 C++/C 程序通常分为两个文件。一个文件用于保存程序的声明（declaration），称为头文件。另一个文件用于保存程序的实现（implementaTIon），称为定义（definiTIon）文件。 C++/C 程序的头文件以“.h”为后缀，C 程序的定义文件以“.c”为后缀，C++程序的定义文件通常以“.cpp”为后缀（也有一些系统以“.cc”或“.cxx”为后缀）。 自从计算机问世以来，程序设计就成了令人羡慕的职业，程序员在受人宠爱之后容易发展成为毛病特多却常能自我臭美的群体。如今在 Internet 上流传的“真正”的程序员据说是这样的： （1） 真正的程序员没有进度表，只有讨好领导的马屁精才有进度表，真正的程序员会让领导提心吊胆。 （2） 真正的程序员不写使用说明书，用户应当自己去猜想程序的功能。 （3） 真正的程序员几乎不写代码的注释，如果注释很难写，它理所当然也很难读。 （4） 真正的程序员不画流程图，原始人和文盲才会干这事。 （5） 真正的程序员不看参考手册，新手和胆小鬼才会看。 （6） 真正的程序员不写文档也不需要文档，只有看不懂程序的笨蛋才用文档。 （7） 真正的程序员认为自己比用户更明白用户需要什么。 （8） 真正的程序员不接受团队开发的理念，除非他自己是头头。 （9） 真正的程序员的程序不会在第一次就正确运行，但是他们愿意守着机器进行若干个 30 小时的调试改错。 （10）真正的程序员不会在上午 9:00 到下午 5:00 之间工作，如果你看到他在上午 9:00 工作，这表明他从昨晚一直干到现在。 …… 具备上述特征越多，越显得水平高，资格老。所以别奇怪，程序员的很多缺点竟然可以被当作优点来欣赏。就象在武侠小说中，那些独来独往、不受约束且带点邪气的高手最令人崇拜。我曾经也这样信奉，并且希望自己成为那样的“真正”的程序员，结果没有得到好下场。
上传时间： 2021-10-26
上传用户：
