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  • 射頻集成電路設計John Rogers(Radio Freq

    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.

    標簽: Rogers Radio John Freq

    上傳時間: 2014-12-23

    上傳用戶:han_zh

  • pci e PCB設計規范

    This document provides practical, common guidelines for incorporating PCI Express interconnect layouts onto Printed Circuit Boards (PCB) ranging from 4-layer desktop baseboard designs to 10- layer or more server baseboard designs. Guidelines and constraints in this document are intended for use on both baseboard and add-in card PCB designs. This includes interconnects between PCI Express devices located on the same baseboard (chip-to-chip routing) and interconnects between a PCI Express device located “down” on the baseboard and a device located “up” on an add-in card attached through a connector. This document is intended to cover all major components of the physical interconnect including design guidelines for the PCB traces, vias and AC coupling capacitors, as well as add-in card edge-finger and connector considerations. The intent of the guidelines and examples is to help ensure that good high-speed signal design practices are used and that the timing/jitter and loss/attenuation budgets can also be met from end-to-end across the PCI Express interconnect. However, while general physical guidelines and suggestions are given, they may not necessarily guarantee adequate performance of the interconnect for all layouts and implementations. Therefore, designers should consider modeling and simulation of the interconnect in order to ensure compliance to all applicable specifications. The document is composed of two main sections. The first section provides an overview of general topology and interconnect guidelines. The second section concentrates on physical layout constraints where bulleted items at the beginning of a topic highlight important constraints, while the narrative that follows offers additional insight.  

    標簽: pci PCB 設計規范

    上傳時間: 2013-10-15

    上傳用戶:busterman

  • 確保電解電容器的壽命長-LED燈泡為例

    Abstract: Electrolytic capacitors are notorious for short lifetimes in high-temperature applications such asLED light bulbs. The careful selection of these devices with proper interpretation of their specifications isessential to ensure that they do not compromise the life of the end product. This application notediscusses this problem with electrolytic capacitors in LED light bulbs and provides an analysis that showshow it is possible to use electrolytics in such products.  

    標簽: LED 電解電容器 壽命

    上傳時間: 2013-11-17

    上傳用戶:asdfasdfd

  • MR16 LED驅動MR16 LED燈與電子變壓器兼容

    Abstract: There are differences between the operation of low-frequency AC transformers and electronic transformersthat supply current to MR16 lamps, and there are also differences in the current draw for MR16 halogen lamps andMR16 LED lamps. These contrasts typically prevent an MR16 LED lamp from operating with most electronictransformers. This article explains how a high-brightness (HB) LED driver optimized for MR16 lamps will allow LEDlamps to be compatible with most electronic transformers.A similar version of this article appeared on Display Plus, July 7, 2012 and in German in Elektronikpraxis, October 1,2012.

    標簽: LED MR 16 驅動

    上傳時間: 2013-10-14

    上傳用戶:playboys0

  • R7732_3_5 AC TO DC PWM Control chip

    R7732_7733_7735是Richpower公司推出的高效AC TO DC 電源PWM控制芯片,最大功率可以做到75W;如有需求請聯系我電話:021-54262182EXT 114 (Eric) QQ :1187337351

    標簽: Control 7732 chip PWM

    上傳時間: 2013-11-20

    上傳用戶:xz85592677

  • 電信、數據通信和工業電源產品

    In industrial applications, high voltage power supply spikes with durations ranging from a few microseconds to hundreds of millisecondsare commonly encountered. The electronics in these systems must not only survive transient voltage spikes, but in many cases alsooperate reliably throughout the event.

    標簽: 電信 數據通信 工業 電源產品

    上傳時間: 2013-11-07

    上傳用戶:redmoons

  • 隔離電源設計手冊

    Abstract: This document details the Oceanside (MAXREFDES9#) subsystem reference design, a 3.3V to 15V input,±15V (±12V) output, isolated power supply. The Oceanside design includes a high-efficiency step-up controller, a36V H-bridge transformer driver for isolated supplies, a wide input range, and adjustable output low-dropout linearregulator (LDO). Test results and hardware files are included.  

    標簽: 隔離電源 設計手冊

    上傳時間: 2013-10-12

    上傳用戶:jinyao

  • 如何設計一個高效率的DC-DC轉換器

    Abstract: The DS1875 features a pulse-width modulation (PWM) controller that can be used to control aDC-DC converter. The DC-DC converter can then be used to generate the high bias voltages necessaryfor avalanche photodiodes (APDs). This application note describes the operation of a boost converterthat uses the DS1875. Discussion covers the selection of the inductor and switching frequency, and theselection of components that improve the efficiency of the converter. Test data are presented.

    標簽: DC-DC 如何設計 高效率 轉換器

    上傳時間: 2013-10-26

    上傳用戶:lyson

  • 為您的FPGA選擇合適的電源

    Abstract: There are many things to consider when designing a power supply for a field-programmablegate array (FPGA). These include (but are not limited to) the high number of voltage rails, and thediffering requirements for both sequencing/tracking and the voltage ripple limits. This application noteexplains these and other power-supply considerations that an engineer must think through whendesigning a power supply for an FPGA.

    標簽: FPGA 電源

    上傳時間: 2013-11-12

    上傳用戶:金苑科技

  • 可程式盤面型位數電表

    精確度0.05%滿刻度±1位數(Accuracy 0.05%F.S.±1digit) 可測量交直流電流/交直流電壓/電位計/傳送器/Pt-100/荷重元/電阻等信號(Measuring DCA/DCV/ACA/ACV/Potentiometer/Transmitter/Pt-100/Load Cell/Resistor/etc……) 顯示范圍0-19999可任意規劃(Programmable rate 0 to 1999 digit) 小數點可任意規劃(Decimal point can be modified) 尺寸小,穩定性高(Dimension small & High stability)

    標簽: 程式 數電

    上傳時間: 2014-01-25

    上傳用戶:RQB123

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