Abstract: Many industrial/scientific/medical (ISM) band radio frequency (RF) products use crystal oscillators to generate areference for the phase-locked loop (PLL)-based local oscillator (LO). This tutorial provides a basic description of theISM-RF Crystal Calculator, which can be used to calculate various impacts on crystal frequency accuracy and startupmargin for such an LO.
上傳時間： 2013-11-15
上傳用戶：JasonC
Abstract: Alexander Graham Bell patented twisted pair wires in 1881. We still use them today because they work so well. In addition we have the advantage ofincredible computer power within our world. Circuit simulators and filter design programs are available for little or no cost. We combine the twisted pair and lowpassfilters to produce spectacular rejection of radio frequency interference (RFI) and electromagnetic interference (EMI). We also illustrate use of a precision resistorarray to produce a customizable differential amplifier. The precision resistors set the gain and common mode rejection ratios, while we choose the frequencyresponse.
上傳時間： 2014-11-26
上傳用戶：Vici
Abstract: This reference design provides a complete demonstration platform for using industrial/scientific/medical radio frequency
上傳時間： 2013-11-09
上傳用戶：LP06
Abstract: Impedance mismatches in a RADIO-frequency (RF) electrical transmission line cause power loss andreflected energy. Voltage standing wave ratio (VSWR) is a way to measure transmission line imperfections. Thistutorial defines VSWR and explains how it is calculated. Finally, an antenna VSWR monitoring system is shown.
標(biāo)簽： VSWR 輸電線路 精確測量 電壓駐波比
上傳時間： 2013-10-19
上傳用戶：yuanwenjiao
介紹一種簡單射頻識別系統(tǒng)設(shè)計。該設(shè)計包括閱讀器、應(yīng)答器和線圈3部分。由單片機(jī)控制閱讀器向應(yīng)答器發(fā)射無線信號，并接收應(yīng)答器回送的信號，再通過分析回送信號識別物品。閱讀器和應(yīng)答器之間以半雙工通信方式通信。 Abstract: A simple design of radio frequency identification system is given in this paper.The design includes reader,responder and winding.Through MCU，signals are sent to responder from reader，then corresponding signals are sent back. According to the analysis of the signals sent back，the objects can be identified.Half-duplex communication is adopted? between? reader? and? responder.
上傳時間： 2013-10-11
上傳用戶：plsee
Microchip ZigBee協(xié)議棧:ZigBee™ 是專為低速率傳感器和控制網(wǎng)絡(luò)設(shè)計的無線網(wǎng)絡(luò)協(xié)議。有許多應(yīng)用可從ZigBee 協(xié)議受益，其中可能的一些應(yīng)用有：建筑自動化網(wǎng)絡(luò)、住宅安防系統(tǒng)、工業(yè)控制網(wǎng)絡(luò)、遠(yuǎn)程抄表以及PC 外設(shè)。與其他無線協(xié)議相比， ZigBee 無線協(xié)議提供了低復(fù)雜性、縮減的資源要求，最重要的是它提供了一組標(biāo)準(zhǔn)的規(guī)范。它還提供了三個工作頻帶，以及一些網(wǎng)絡(luò)配置和可選的安全功能。如果您正在尋求現(xiàn)有的控制網(wǎng)絡(luò)技術(shù)（例如RS-422、RS-485）或?qū)Ｓ袩o線協(xié)議的替代方案， ZigBee 協(xié)議可能是您所需的解決方案。此應(yīng)用筆記旨在幫助您在應(yīng)用中采用ZigBee 協(xié)議。 可以使用在應(yīng)用筆記中提供的Microchip ZigBee 協(xié)議棧快速地構(gòu)建應(yīng)用。為了說明該協(xié)議棧的用法，本文包含了兩個有效的演示應(yīng)用程序。可將這兩個演示程序作為參考或者根據(jù)您的需求經(jīng)過簡單修改來采用它們。此應(yīng)用筆記中提供的協(xié)議棧函數(shù)庫實現(xiàn)了一個與物理層無關(guān)的應(yīng)用程序接口。 因此，無需做重大修改就可以輕松地在射頻（Radio Frequency，RF）收發(fā)器之間移植應(yīng)用程序。在此文檔末尾的“常見問題解答”中提供了有關(guān)Microchip 協(xié)議棧和用法的一些常見問題及其答案。
標(biāo)簽： Microchip ZigBee 協(xié)議棧
上傳時間： 2013-10-08
上傳用戶：u789u789u789
Abstract: Many industrial/scientific/medical (ISM) band radio frequency (RF) receivers use an external Sallen-Key datafilter and a data slicer to generate the baseband digital output. This tutorial describes the ISM-RF Baseband Calculator,which can be used to calculate the filter capacitor values and the data slicer RC components, while providing a visualexample of the baseband signals.
上傳時間： 2013-11-04
上傳用戶：jkhjkh1982
RFID（Radio Frequency Identification）技術(shù)是利用射頻通信實現(xiàn)的一種非接觸式自動識別技術(shù)。擁有廣闊的發(fā)展前景和巨大的市場潛力。本文介紹了RFID技術(shù)的原理、特點，深入分析了信號傳輸時所采取的反方向散射的調(diào)制方式，影響傳輸距離的因素，最后介紹了在遠(yuǎn)程RFID自動識別系統(tǒng)中的讀寫沖突和防沖突算法，更好的解決了遠(yuǎn)程RFID系統(tǒng)存在的沖突問題。
標(biāo)簽： RFID 遠(yuǎn)程 技術(shù)探討
上傳時間： 2013-10-11
上傳用戶：fdfadfs
Abstract: This application note describes system-level characterization and modeling techniques for radio frequency (RF) and microwavesubsystem components. It illustrates their use in a mixed-signal, mixed-mode system-level simulation. The simulation uses an RF transmitterwith digital predistortion (DPD) as an example system. Details of this complex system and performance data are presented.
標(biāo)簽： 射頻 仿真 微波系統(tǒng) 建模
上傳時間： 2013-12-18
上傳用戶：onewq
Abstract: With industrial/scientific/medical (ISM) band radio frequency (RF) products, often times users are new to the structure of Maxim's low pin-count transmitters andfully integrated superheterodyne receivers. This tutorial provides simple steps that can be taken to get the best performance out of these transmitters and receivers whileproviding techniques to measure the overall capability of the design.
上傳時間： 2013-11-02
上傳用戶：yph853211
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