When I started writing the first edition of RF Power Amplifiers for Wireless Communications,some time back in 1997, it seemed that I was roaming a largely uninhabitedlandscape. For reasons still not clear to me there were few, if any, otherbooks dedicated to the subject of RF power amplifiers. Right at the same time, however,hundreds of engineers were being assigned projects to design PAs for wirelesscommunications products. It was not, therefore, especially difficult to be successfulwith a book that was fortuitously at the right place and the right time.
標(biāo)簽: Communications Amplifiers Wireless Edition
上傳時(shí)間: 2013-11-12
上傳用戶:YYRR
RF circuit design theory and application(射頻電路設(shè)計(jì))
標(biāo)簽: application circuit design theory
上傳時(shí)間: 2014-12-30
上傳用戶:aeiouetla
運(yùn)用三維全波電磁仿真軟件對(duì)甚低頻T形面型天線進(jìn)行電磁建模和仿真分析計(jì)算,分析了天線的輸入阻抗、有效高度、電容等電氣參數(shù)。在建模時(shí)考慮了鐵塔及不同頂容線模型的影響,并對(duì)有無鐵塔及不同鐵塔類型、以及天線不同形式時(shí)天線的輸入阻抗進(jìn)行對(duì)比分析。
上傳時(shí)間: 2013-10-13
上傳用戶:LouieWu
Linear Technology offers some of the highest performance RF and signal chain solutions for wireless and cellularinfrastructure. These products support worldwide standards including, LTE, WiMAX, GSM,W-CDMA, TD-SCDMA,CDMA, and CDMA2000. Other wireless systems include broadband microwave data links, secure communications,satellite receivers, broadband wireless access, wireless broadcast systems, RFID readers and cable infrastructure
上傳時(shí)間: 2013-11-04
上傳用戶:kiklkook
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(shí)間: 2013-11-02
上傳用戶:yph853211
概覽 通過與傳統(tǒng)的儀器進(jìn)行比較,了解軟件定義的PXI RF儀器在速度上的優(yōu)勢(shì)。如WCDMA測(cè)量結(jié)果所示,基于多核處理器并行執(zhí)行的labview測(cè)量算法與傳統(tǒng)儀器相比可以實(shí)現(xiàn)明顯的速度提升。 介紹 你在早晨7:00伴著搖滾音樂的聲音醒來,收音機(jī)鬧鐘里的RDS接收器提示你正在收聽來自Guns N’ Roses 樂隊(duì)的Welcome to the Jungle。然后,在你品嘗咖啡期時(shí),可以在書房通過WLAN接收器來查收郵件。當(dāng)準(zhǔn)備好工作后,你走出家門,使用一個(gè)315MHz的FSK發(fā)射機(jī)來打開車鎖。坐到車?yán)铮偵系缆罚阌挚梢韵硎軣o線電收音機(jī)所提供的沒有廣告的娛樂節(jié)目。稍后,你會(huì)通過藍(lán)牙耳機(jī)會(huì)與車內(nèi)的3G手機(jī)建立連接。幾分鐘內(nèi),車載的GPS導(dǎo)航儀可以修正你當(dāng)前的3D位置,并向你指示路徑。GPS接收機(jī)傳出的聲音提示你需要駛?cè)胧召M(fèi)公路,同時(shí)RFID接收器將自動(dòng)收取相應(yīng)的過路費(fèi)。 RF技術(shù)無處不在。即便作為一個(gè)普通的消費(fèi)者,每時(shí)每刻都會(huì)受其影響,更不要說一個(gè)RF測(cè)試工程師了。無線設(shè)備的成本大幅降低,可以讓業(yè)余的時(shí)間變得更輕松,但是在設(shè)計(jì)下一代RF自動(dòng)測(cè)試系統(tǒng)時(shí),將會(huì)帶來更多的挑戰(zhàn)。工程項(xiàng)目所面臨的降低測(cè)試成本的挑戰(zhàn),比以往任何時(shí)候都嚴(yán)峻。因此,當(dāng)前的自動(dòng)測(cè)試系統(tǒng)所關(guān)注的焦點(diǎn)在于減少整體的測(cè)試時(shí)間。
標(biāo)簽: WCDMA RF 基準(zhǔn) 比較
上傳時(shí)間: 2013-10-09
上傳用戶:wangrong
在 PADS2007 中,增加一部分專門針對(duì)射頻(RF)設(shè)計(jì)的功能模塊,包括前面介紹的通過AutoCAD 的DXF 文件導(dǎo)入,來建立一個(gè)特殊形狀的器件管腳。下面我們來介紹一下在高速或者高頻電路板設(shè)計(jì)中,如何在PCB 板邊,或者高速、高頻信號(hào)線周圍,或者PCB 板上的空余區(qū)域添加屏蔽地過孔。我們先來看一下在沒有 PADS2007 的RF 設(shè)計(jì)模塊的情況下,是如何手工添加GND 過孔的。
上傳時(shí)間: 2013-11-19
上傳用戶:haohao
protel99se元件名系表
上傳時(shí)間: 2013-11-12
上傳用戶:sz_hjbf
針對(duì)一般測(cè)溫方法在進(jìn)行流體多點(diǎn)溫度測(cè)量時(shí)存在系統(tǒng)復(fù)雜,準(zhǔn)確度和速度難以兼顧的問題,提出了一種基于溫度-頻率(T-F)變換的測(cè)量系統(tǒng)。該系統(tǒng)使用PIC18F6722單片機(jī)控制MOS管開關(guān)陣列,使多個(gè)測(cè)點(diǎn)的熱敏電阻分別與TLC555構(gòu)成振蕩電路,將測(cè)點(diǎn)的溫度變化轉(zhuǎn)化為振蕩頻率的變化,使用8253計(jì)數(shù)芯片對(duì)TLC555的輸出信號(hào)進(jìn)行測(cè)量并產(chǎn)生中斷,單片機(jī)讀取8253計(jì)數(shù)值反演為測(cè)點(diǎn)溫度。實(shí)驗(yàn)表明,測(cè)點(diǎn)數(shù)目增多不會(huì)增加測(cè)量系統(tǒng)的復(fù)雜程度,通過設(shè)置8253的計(jì)數(shù)初值,可以在不改變硬件的情況下靈活選擇測(cè)量的準(zhǔn)確度和速度,滿足了流體多點(diǎn)精確快速測(cè)溫的需求。同時(shí)該系統(tǒng)具備簡(jiǎn)潔實(shí)用,成本低的優(yōu)點(diǎn)。
上傳時(shí)間: 2013-10-23
上傳用戶:assef
華科控制系的最新交流電機(jī)講義
上傳時(shí)間: 2014-12-03
上傳用戶:nanfeicui
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