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(hù)：kinochen
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.
標(biāo)簽： Susceptibility Radio 無(wú)線電干擾
上傳時(shí)間： 2014-12-30
上傳用戶(hù)：旗魚(yú)旗魚(yú)
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.
標(biāo)簽： 技術(shù)資料
上傳時(shí)間： 2013-10-08
上傳用戶(hù)：stewart·
關(guān)于射頻(RF) 關(guān)于射頻集成電路 無(wú)線通信與射頻集成電路設(shè)計(jì) 課程相關(guān)信息 RFIC相關(guān)IEEE/IEE期刊和會(huì)議• 是什么推動(dòng)了RFIC 的發(fā)展？• Why RFIC?– Why IC?– 體積更小，功耗更低，更便宜→ 移動(dòng)性、個(gè)人化、低成本– 功能更強(qiáng)，適合于復(fù)雜的現(xiàn)代通信網(wǎng)絡(luò)– 更廣泛的應(yīng)用領(lǐng)域如生物芯片、RFID 等• Quiz: why not fully integrated?• 射頻集成電路設(shè)計(jì)最具挑戰(zhàn)性之處在于,設(shè)計(jì)者向上必須懂得無(wú)線系統(tǒng)的知識(shí),向下必須具備集成電路物理和工藝基礎(chǔ),既要掌握模擬電路的設(shè)計(jì)和分析技巧,又要熟悉射頻和微波的理論與技術(shù)。(當(dāng)然,高技術(shù)應(yīng)該帶來(lái)高收益:)
標(biāo)簽： 射頻集成 電路設(shè)計(jì) 講義
上傳時(shí)間： 2014-05-08
上傳用戶(hù)：liuchee
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.
上傳時(shí)間： 2014-03-25
上傳用戶(hù)：yyyyyyyyyy
ORCAD在使用的時(shí)候總會(huì)出現(xiàn)這樣或那樣的問(wèn)題…但下這個(gè)問(wèn)題比較奇怪…在ORCAD中無(wú)法輸出網(wǎng)表…彈出下面的錯(cuò)誤….這種問(wèn)題很是奇怪…Netlist Format: tango.dllDesign Name: D:\EDA_PROJECT\PROTEL99SE\YK\SV3200\MAIN.DSNERROR [NET0021] Cannot get part.[FMT0024] Ref-des not found. Possible Logical/Physical annotation conflict.[FMT0018] Errors processing intermediate file找了一天沒(méi)找到問(wèn)題…終于在花了N多時(shí)間后發(fā)現(xiàn)問(wèn)題所在…其實(shí)這個(gè)問(wèn)題就是不要使用ORCAD PSPICE 庫(kù)里面的元件來(lái)畫(huà)電路圖…實(shí)際中我是用了PSPICE里面和自己制作的二種電阻和電容混合在一起…就會(huì)出現(xiàn)這種問(wèn)題…
標(biāo)簽： orcad 無(wú)法輸出 網(wǎng)表
上傳時(shí)間： 2013-11-21
上傳用戶(hù)：zaocan888
It would not be an exaggeration to say that semiconductor devices have transformed humanlife. From computers to communications to internet and video games these devices and the technologies they have enabled have expanded human experience in a way that is unique in history. Semiconductor devices have exploited materials, physics and imaginative applications to spawn new lifestyles. Of course for the device engineer, in spite of the advances, the challenges of reaching higher frequency, lower power consumption, higher power generation etc.
標(biāo)簽： 半導(dǎo)體器件 物理
上傳時(shí)間： 2013-10-28
上傳用戶(hù)：songnanhua
三菱PLC編程軟件（中文）. 三菱FX系列PLC解密軟件 V3.1里面包含了三菱PLC編程軟件（中文）教程，安裝方法 三菱PLC編程軟件 GX-developer 安裝詳細(xì)說(shuō)明 請(qǐng)將軟件安裝壓縮包解壓到D盤(pán)根目錄或者C盤(pán)根目錄進(jìn)行安裝，太深的目錄容易出錯(cuò) 在安裝程序之前，最好先把其他應(yīng)用程序關(guān)閉，比如殺毒軟件，防火墻，IE，辦公軟件 1，在Gx Developer文件夾中，有一個(gè)文件夾“EnvMEL”，進(jìn)入，點(diǎn)擊“SETUP.EXE”安裝“通用環(huán)境” 安裝大部分三菱軟件都要先安裝“通用環(huán)境” 2，然后點(diǎn)擊Gx Developer下的“SETUP.EXE” 正式安裝三菱PLC編程軟件Gx Developer 注意，其他的幾個(gè)文件夾，在安裝時(shí)候主安裝程序會(huì)自動(dòng)調(diào)用，不必管它。 3，安裝路徑最好使用默認(rèn)的，不要更改，輸入各種注冊(cè)信息后，輸入序列號(hào)： 注意，不同軟件的序列號(hào)可能會(huì)不相同，序列號(hào)可以在下載后的壓縮包里得到。 4，“監(jiān)視專(zhuān)用”這里不能打勾，否則就只能監(jiān)視不能編程了 5，等待安裝過(guò)程 6，直到出現(xiàn)此窗口： 7，開(kāi)始/程序 里可以找到安裝好的文件
上傳時(shí)間： 2013-11-01
上傳用戶(hù)：mnacyf
This example provides a description of how to use the USART with hardware flowcontrol and communicate with the Hyperterminal.First, the USART2 sends the TxBuffer to the hyperterminal and still waiting fora string from the hyperterminal that you must enter which must end by '\r'character (keypad ENTER button). Each byte received is retransmitted to theHyperterminal. The string that you have entered is stored in the RxBuffer array. The receivebuffer have a RxBufferSize bytes as maximum. The USART2 is configured as follow: - BaudRate = 115200 baud - Word Length = 8 Bits - One Stop Bit - No parity - Hardware flow control enabled (RTS and CTS signals) - Receive and transmit enabled - USART Clock disabled - USART CPOL: Clock is active low - USART CPHA: Data is captured on the second edge - USART LastBit: The clock pulse of the last data bit is not output to the SCLK pin
上傳時(shí)間： 2013-10-31
上傳用戶(hù)：yy_cn
This example shows how to update at regulate period the WWDG counter using theEarly Wakeup interrupt (EWI). The WWDG timeout is set to 262ms, refresh window set to 41h and the EWI isenabled. When the WWDG counter reaches 40h the EWI is generated and in the WWDGISR the counter is refreshed to prevent a WWDG reset and led connected to PC.07is toggled.The EXTI line9 is connected to PB.09 pin and configured to generate an interrupton falling edge.In the NVIC, EXTI line9 to 5 interrupt vector is enabled with priority equal to 0and the WWDG interrupt vector is enabled with priority equal to 1 (EXTI IT > WWDG IT). The EXTI Line9 will be used to simulate a software failure: once the EXTI line9event occurs (by pressing Key push-button on EVAL board) the correspondent interruptis served, in the ISR the led connected to PC.07 is turned off and the EXTI line9pending bit is not cleared. So the CPU will execute indefinitely EXTI line9 ISR andthe WWDG ISR will never be entered(WWDG counter not updated). As result, when theWWDG counter falls to 3Fh the WWDG reset occurs.If the EXTI line9 event don抰 occurs the WWDG counter is indefinitely refreshed inthe WWDG ISR which prevent from WWDG reset. If the WWDG reset is generated, after resuming from reset a led connected to PC.06is turned on. In this example the system is clocked by the HSE(8MHz).
上傳時(shí)間： 2013-11-11
上傳用戶(hù)：gundamwzc
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