Designing read/write device (RWD) units for industrial RF-Identification applications is strongly facilitated by the NXP Semiconductors HITAG Reader Chip HTRC110. All needed function blocks, like the ANTENNA driver, modulator demodulator and ANTENNA diagnosis unit, are integrated in the HTRC110. Therefore only a minimum number of additional passive components are required for a complete RWD. This Application Note describes how to design an industrial RF-Identification system with the HTRC110. The major focus is dimensioning of the ANTENNA, all other external components including clock and power supply, as well as the demodulation principle and its implementatio
標(biāo)簽： HITAG HTRC 110 讀寫(xiě)芯片
上傳時(shí)間： 2013-10-22
上傳用戶：zhengjian
基于幅移鍵控技術(shù)ASK（Amplitude-Shift Keying），以C8051F340單片機(jī)作為監(jiān)測(cè)終端控制器，C8051F330D單片機(jī)作為探測(cè)節(jié)點(diǎn)控制器，采用半雙工的通信方式，通過(guò)監(jiān)控終端和探測(cè)節(jié)點(diǎn)的無(wú)線收發(fā)電路，實(shí)現(xiàn)數(shù)據(jù)的雙向無(wú)線傳輸。收發(fā)電路采用直徑為0.8 mm的漆包線自行繞制成圓形空心線圈天線，天線直徑為（3.4±0.3）cm。試驗(yàn)表明，探測(cè)節(jié)點(diǎn)與監(jiān)測(cè)終端的通信距離為24 cm，通過(guò)橋接方式，節(jié)點(diǎn)收發(fā)功率為102 mW時(shí)，節(jié)點(diǎn)間的通信距離可達(dá)20 cm。與傳統(tǒng)無(wú)線收發(fā)模塊相比，該無(wú)線收發(fā)電路在受體積、功耗、成本限制的場(chǎng)合有廣闊的應(yīng)用前景。 Abstract: Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller， using half-duplex communication mode， this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter （3.4±0.3） cm circular hollow coil ANTENNA. Tests show that the communication distance between detection and monitoring of the terminal is 24cm，the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules， the circuit has wide application prospect in small size， low cost and low power consumption and other characteristics.
標(biāo)簽： C8051F 單片機(jī) 無(wú)線收發(fā) 電路設(shè)計(jì)
上傳時(shí)間： 2013-10-19
上傳用戶：xz85592677
Abstract: The process of designing a radio system can be complex and often involves many project tradeoffs. Witha little insight, balancing these various characteristics can make the job of designing a radio system easier. Thistutorial explores these tradeoffs and provides details to consider for various radio applications. With a focus on theindustrial, scientific, medical (ISM) bands, the subjects of frequency selection, one-way versus two-way systems,modulation techniques, cost, ANTENNA options, power-supply influences, effects on range, and protocol selectionare explored.
標(biāo)簽： 無(wú)線
上傳時(shí)間： 2013-12-13
上傳用戶：eastgan
Abstract: This application note discusses a design for a phantom ANTENNA power-supply system compatible with theDigital Satellite Equipment Control (DiSEqC) communication standard, using the MAX16948 automotive dual, highvoltageLDO/switch. The presented application circuit provides a remote ANTENNA power supply and also enables onewaycommunication from the radio head unit to the remote ANTENNA. This system architecture offers flexibility inDiSEqC tone-burst frequency choice (100Hz to 30kHz), enabling users the ability to select the best frequency for theirapplication.
標(biāo)簽： 數(shù)字衛(wèi)星 控制 兼容 供電系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-11-17
上傳用戶：fnhhs
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.
標(biāo)簽： 射頻 基礎(chǔ)知識(shí)
上傳時(shí)間： 2013-10-23
上傳用戶：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.
標(biāo)簽： 無(wú)線技術(shù)
上傳時(shí)間： 2013-10-08
上傳用戶：kinochen
Abstract: This article describes the ANTENNA Interface Standards Group (AISG) standard in telecommunications and details itshardware implementation. It explains how a fully integrated transceiver such as the MAX9947 can help reduce space and cost, andsolve bus arbitrations in base-station tower equipment.
標(biāo)簽： AISG 硬件 分立收發(fā)器 控制系統(tǒng)
上傳時(shí)間： 2014-12-30
上傳用戶：wangchong
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.
上傳時(shí)間： 2013-10-17
上傳用戶：lepoke
天線(ANTENNA)是一種變換器，它把傳輸線上傳播的導(dǎo)行波，變換成在無(wú)界媒介(通常是自由空間)中傳播的電磁波，或者進(jìn)行相反的變換。在無(wú)線電設(shè)備中用來(lái)發(fā)射或接收電磁波的部件。
上傳時(shí)間： 2013-10-23
上傳用戶：小眼睛LSL
Abstract: This application note helps system designers choose the correct external components for use with the MAX16948 dualremote ANTENNA LDO/switch, thus ensuring that automobile-regulated phantom ANTENNA supply and output-current-monitoring circuitrymeet performance objectives. An electronic calculator is provided that helps specify the critical external components for theMAX16948, thus reducing design time. The calculator also determines the device's analog output voltage, output current-limitthreshold, and output current-sensing accuracies. The calculator includes new automatic Step By Step feature that assists designerswith component choice. To use the new automatic feature, click on the Step By Step button relative to the desired section.
上傳時(shí)間： 2013-11-04
上傳用戶：lhll918
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