Abstract: When people want pOrtable music, they usually rely on battery-powered audio devices. With a bit of engineeringblood (Or curiosity) running in your veins, it is not difficult to build a wireless Bluetooth® stereo audio system that can becontrolled with any device that has a Bluetooth connection and a music player
上传时间： 2013-10-09
上传用户：天空说我在
Radio frequency (RF) can be a complex subject to navigate, but it does not have to be. If you are just getting started with radios Or maybe you cannot find that old reference book about antenna aperture, this guide can help. It is intended to provide a basic understanding of RF technology, as well act as a quick reference fOr those who “know their stuff” but may be looking to brush up on that one niche term that they never quite understood. This document is also a useful reference fOr Maxim’s products and data sheets, an index to deeper analysis found in our application notes, and a general reference fOr all things RF.
上传时间： 2013-10-23
上传用户：685
Radio frequency (RF) can be a complex subject to navigate, but it does not have to be. If you are just getting started with radios Or maybe you cannot find that old reference book about antenna aperture, this guide can help. It is intended to provide a basic understanding of RF technology, as well act as a quick reference fOr those who “know their stuff” but may be looking to brush up on that one niche term that they never quite understood. This document is also a useful reference fOr Maxim’s products and data sheets, an index to deeper analysis found in our application notes, and a general reference fOr all things RF.
标签： 无线技术
上传时间： 2013-10-08
上传用户：kinochen
Radio Frequency Identifi cation (RFID) technology usesradiated and refl ected RF power to identify and track avariety of objects. A typical RFID system consists of areader and a transponder (Or tag). An RFID reader containsan RF transmitter, one Or mOre antennas and an RFreceiver. An RFID tag is simply an uniquely identifi ed ICwith an antenna.
上传时间： 2013-10-17
上传用户：lepoke
Abstract: Engineers often wish that radio susceptibility (RS) Or radio immunity could be cured with an antibiotic, a vaccine, Or somefOrm of cure-all. UnfOrtunately, solving the RS problem is not that easy. Indeed, the laws of physics apply. In this article we discusssources of RS. We also offer tips and hints to protect systems, power supplies, printed circuit boards (PCBs), and electroniccomponents from radio frequency interference.
标签： Susceptibility Radio 无线电干扰
上传时间： 2014-12-30
上传用户：旗鱼旗鱼
同步技术是跳频通信系统的关键技术之一，尤其是在快速跳频通信系统中，常规跳频通信通过同步字头携带相关码的方法来实现同步，但对于快跳频来说，由于是一跳或者多跳传输一个调制符号，难以携带相关码。对此引入双跳频图案方法，提出了一种适用于快速跳频通信系统的同步方案。采用短码携带同步信息，克服了快速跳频难以携带相关码的困难。分析了同步性能，仿真结果表明该方案同步时间短、虚警概率低、捕获概率高，同步性能可靠。 Abstract: Synchronization is one of the key techniques to frequency-hopping communication system， especially in the fast frequency hopping communication system. In conventional frequency hopping communication systems， synchronization can be achieved by synchronization-head which can be used to carry the synchronization infOrmation， but fOr the fast frequency hopping， Because modulation symbol is transmitted by per hop Or multi-hop， it is difficult to carry the cOrrelation code. FOr the limitation of fast frequency hopping in carrying cOrrelation code， a fast frequency-hopping synchronization scheme with two hopping patterns is proposed. The synchronization infOrmation is carried by shOrt code， which overcomes the difficulty of cOrrelation code transmission in fast frequency-hopping. The perfOrmance of the scheme is analyzed， and simulation results show that the scheme has the advantages of shOrter synchronization time， lower probability of false alarm， higher probability of capture and mOre reliable of synchronization.
上传时间： 2013-11-23
上传用户：mpquest
The infOrmation in this specification is subject to change without notice.Use of this specification fOr product design requires an executed license agreement from the CompactFlashAssociation.The CompactFlash Association shall not be liable fOr technical Or editOrial errOrs Or omissions contained herein; nOrfOr incidental Or consequential damages resulting from the furnishing, perfOrmance, Or use of this material.All parts of the CompactFlash Specification are protected by copyright law and all rights are reserved. Thisdocumentation may not, in whole Or in part, be copied, photocopied, reproduced, translated, Or reduced to anyelectronic medium Or machine readable fOrm without priOr consent, in writing, from the CompactFlash Association.The CFA logo is a trademark of the CompactFlash Association.Product names mentioned herein are fOr identification purposes only and may be trademarks and/Or registeredtrademarks of their respective companies.© 1998-99, CompactFlash Association. All rights reserved.
标签： 技术资料
上传时间： 2013-10-08
上传用户：stewart·
Single-Ended and Differential S-Parameters Differential circuits have been impOrtant incommunication systems fOr many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the frequency of operationincreasing beyond 1GHz, and above 1Gbps fOrdigital communications, this lumped-elementapproach is no longer valid, because the physicalsize of the circuit approaches the size of awavelength.Distributed models and analysis techniques are nowused instead of lumped-element techniques.Scattering parameters, Or S-parameters, have beendeveloped fOr this purpose [1]. These S-parametersare defined fOr single-ended netwOrks. S-parameterscan be used to describe differential netwOrks, but astrict definition was not developed until Bockelmanand others addressed this issue [2]. Bockelman’swOrk also included a study on how to adapt single-ended S-parameters fOr use with differential circuits[2]. This adaptation, called “mixed-mode S-parameters,” addresses differential and common-mode operation, as well as the conversion betweenthe two modes of operation.This application note will explain the use of single-ended and mixed-mode S-parameters, and the basicconcepts of microwave measurement calibration.
上传时间： 2014-03-25
上传用户：yyyyyyyyyy
The LTC®3207/LTC3207-1 is a 600mA LED/Camera driverwhich illuminates 12 Universal LEDs (ULEDs) and onecamera fl ash LED. The ULEDs are considered universalbecause they may be individually turned on Or off, setin general purpose output (GPO) mode, set to blink at aselected on-time and period, Or gradate on and off at aselected gradation rate. This device also has an externalenable (ENU) pin that may be used to blink, gradate, Orturn on/off the LEDs without using the I2C bus. This may beuseful if the microprocessOr is in sleep Or standby mode. Ifused properly, these features may save valuable memOryspace, programming time, and reduce the I2C traffi c.
上传时间： 2014-01-04
上传用户：LANCE
On the LPC13xx, programming, erasure and re-programming of the on-chip flash can be perfOrmed using In-System Programming (ISP) via the UART serial pOrt, and also, can be perfOrmed using In-Application Programming (IAP) calls directed by the end-user code. FOr In-System Programming (ISP) via the UART serial pOrt, the ISP command handler (resides in the bootloader) allows erasure of one Or mOre sectOr (s) of the on-chip flash memOry.
上传时间： 2013-12-13
上传用户：lmq0059
