本文介紹了AD公司的RF/IF相位和幅度測量芯片AD8302，并以此芯片為核心，組合功分器、延遲線和FPGA芯片設計了瞬時測頻接收機，改進了傳統的設計方案。依照設計制作了測頻系統，并對系統整體性能進行了測試，測試結果表明本系統可以準確測量1.4~2.0 GHz范圍內的信號，測頻精度為10 MHz。
上傳時間： 2013-10-26
上傳用戶：zsjzc
單端雙極輸入信號的推薦電路如圖 1 所示。Vs+ 是放大器的電源；負電源輸入接地。VIN 為輸入信號源，其表現為一個在接地電位（±0 V）附近擺動的接地參考信號，從而形成一個雙極信號。RG 和 RF 為放大器的主增益設置電阻。VOUT+和 VOUT- 為 ADC 的差動輸出信號。它們的相位差為 180o，并且電平轉換為VOCM。
上傳時間： 2013-10-31
上傳用戶：15527161163
本電路為寬帶直接變頻發射機模擬部分的完整實施方案（模擬基帶輸入、RF輸出）。通過使用鎖相環(PLL)和寬帶集成電壓控制振蕩器(VCO)，本電路支持500 MHz至4.4 GHz范圍內的RF頻率。PLL中的LO執行諧波濾波，確保提供出色的正交精度。低噪聲LDO確保電源管理方案對相位噪聲和EVM沒有不利影響。這種器件組合可以提供500 MHz至4.4 GHz頻率范圍內業界領先的直接變頻發射機性能。
上傳時間： 2013-11-23
上傳用戶：墻角有棵樹
該款立體聲調制度監視儀/分析儀可以保證FM發射記優質工作和 FM 電臺保持在最大的調制電平或對發射機的性能進行檢測。根據全美和國際標準，該款監視儀特設頻率合成的RF預選器，可按50KHZ檔預選頻率。精確 的 基帶解調，PLL 立體聲信道解碼，線性相位濾波器，為監視調制度電平和性能的檢測提供了全面的方便的測試。多路音頻輸入可供檢測和外接失真儀。該款儀器外接天線時可與低電平 RF輸入端連接，也可經傳輸線耦合到高電平 RF輸入端。
上傳時間： 2013-11-15
上傳用戶：skhlm
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
本書內容包括三大部分：第1 部分從運算放大器的基本概念和理論出發，重點介紹了運算放大器的原理與設計，以及在各種電子系統中的應用，包括視頻應用、RF/IF 子系統(乘法器、調制器和混頻器)等;第2 部分主要介紹了高速采樣和高速ADC 及其應用、高速DAC 及其應用、以及DDS 系統與接收機子系統等;第3 部分介紹了有關高速硬件設計技術，如仿真、建模、原型、布局、去藕與接地，以及EMI 與RFI設計考慮等。 書中內容既有完整的理論分析，又有具體的實際應用電路，還包括許多應用技巧。特別適合電子電路與系統設計工程師、高等院校相關專業師生閱讀。
上傳時間： 2013-11-16
上傳用戶：qitiand
Abstract: The MAX9930–MAX9933 family of RF controllers and detector can be used in a wide variety of applications. Anideal application is cable television (CATV) over fiber, where either a RF controller or a RF detector controls the gain of atransimpedance amplifier (TIA). This application note shows how the MAX9930 (RF controller) can be used as either theRF controller or detector.
上傳時間： 2013-10-11
上傳用戶：Pzj
Linear Technology’s High Frequency Product lineupincludes a variety of RF I/Q modulators. The purpose ofthis application note is to illustrate the circuits requiredto interface these modulators with several popular D/Aconverters. Such circuits typically are required to maximizethe voltage transfer from the DAC to the baseband inputsof the modulator, as well as provide some reconstructionfi ltering.
上傳時間： 2013-10-19
上傳用戶：FreeSky
噪聲系數(NF)是RF系統設計師常用的一個參數，它用于表征RF放大器、混頻器等器件的噪聲，并且被廣泛用作無線電接收機設計的一個工具。許多優秀的通信和接收機設計教材都對噪聲系數進行了詳細的說明(例如參考文獻1)，本文重點討論該參數在數據轉換器中的應用。
上傳時間： 2013-11-05
上傳用戶：李彥東
Radio Frequency Integrated Circuit Design I enjoyed reading this book for a number of reasons. One reason is that itaddresses high-speed analog design in the context of microwave issues. This isan advanced-level book, which should follow courses in basic circuits andtransmission lines. Most analog integrated circuit designers in the past workedon applications at low enough frequency that microwave issues did not arise.As a consequence, they were adept at lumped parameter circuits and often notcomfortable with circuits where waves travel in space. However, in order todesign radio frequency (RF) communications integrated circuits (IC) in thegigahertz range, one must deal with transmission lines at chip interfaces andwhere interconnections on chip are far apart. Also, impedance matching isaddressed, which is a topic that arises most often in microwave circuits. In mycareer, there has been a gap in comprehension between analog low-frequencydesigners and microwave designers. Often, similar issues were dealt with in twodifferent languages. Although this book is more firmly based in lumped-elementanalog circuit design, it is nice to see that microwave knowledge is brought inwhere necessary.Too many analog circuit books in the past have concentrated first on thecircuit side rather than on basic theory behind their application in communications.The circuits usually used have evolved through experience, without asatisfying intellectual theme in describing them. Why a given circuit works bestcan be subtle, and often these circuits are chosen only through experience. Forthis reason, I am happy that the book begins first with topics that require anintellectual approach—noise, linearity and filtering, and technology issues. Iam particularly happy with how linearity is introduced (power series). In therest of the book it is then shown, with specific circuits and numerical examples,how linearity and noise issues arise.
上傳時間： 2014-12-23
上傳用戶：han_zh
