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protel 99se 使用技巧以及常見問題解決方法：里面有一些protel 99se 特別技巧，還有我們經常遇到的一些問題！如何使一條走線至兩個不同位置零件的距離相同?
您可先在Design/Rule/High Speed/Matched Net Lengths的規則中來新增規則設定,最后再用Tools/EqualizeNet Lengths 來等長化即可。
Q02、在SCHLIB中造一零件其PIN的屬性，如何決定是Passive, Input, I/O, Hi-
Z,Power,…..？在HELP中能找到說明嗎？市面有關 SIM？PLD？的書嗎？或貴公司有講義？
你可在零件庫自制零件時點選零件Pin腳,并在Electrical Type里,可以自行設定PIN的
屬性,您可參考臺科大的Protel sch 99se 里面有介紹關于SIM的內容。
Q03、請問各位業界前輩,如何能順利讀取pcad8.6版的線路圖,煩請告知
Protel 99SE只能讀取P-CAD 2000的ASCII檔案格式,所以你必須先將P-CAD8.6版的格式轉為P-CAD 2000的檔案格式,才能讓Protel讀取。
Q04、請問我該如何標示線徑大小的那個平方呢
你可以將格點大小設小,還有將字形大小縮小,再放置數字的平方位置即可。
Q05、請問我一次如何更改所有組件的字型
您可以點選其中一個組件字型,再用Global的方法就可以達成你的要求。
標簽：
protel
99
se
使用技巧
上傳時間：
2013-10-22
上傳用戶：yd19890720
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Q01、如何使一條走線至兩個不同位置零件的距離相同?
您可先在Design/Rule/High Speed/Matched Net Lengths的規則中來新增規則設定,最
后再用Tools/EqualizeNet Lengths 來等長化即可。
Q02、在SCHLIB中造一零件其PIN的屬性，如何決定是Passive, Input, I/O, Hi-
Z,Power,…..？在HELP中能找到說明嗎？市面有關 SIM？PLD？的書嗎？或貴公司有講義？
你可在零件庫自制零件時點選零件Pin腳,并在Electrical Type里,可以自行設定PIN的
屬性,您可參考臺科大的Protel sch 99se 里 面有介紹關于SIM的內容。
Q03、請問各位業界前輩,如何能順利讀取pcad8.6版的線路圖,煩請告知
Protel 99SE只能讀取P-CAD 2000的ASCII檔案格式,所以你必須先將P-CAD8.6版的格式
轉為P-CAD 2000的檔案格式,才能讓Protel讀取。
標簽：
Protel
上傳時間：
2013-11-22
上傳用戶：daxigua
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High input impedance and a wide input range are twohighly desirable features in a precision analog-to-digitalconverter, and the LTC®2449 delta-sigma ADC has both.With just a few external components, the LTC2449 formsan exceptional measurement system with very high inputimpedance and an input range that extends 300mV beyondthe supply rails.
標簽：
ADC
精密測量
高輸入阻抗
上傳時間：
2013-11-02
上傳用戶：ywcftc277
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前面討論了很多內容，基本上涉及了有關PCB板的絕大部分相關的知識。第二章探討了傳輸線的基本原理，第三章探討了串擾，在第四章里我們闡述了許多在現代設計中必須關注的非理想互連的問題。對于信號從驅動端引腳到接收端引腳的電氣路徑的相關問題，我們已經做了一些探究，然而對于硅芯片，即處于封裝內部的IC來說，其信號傳輸通常要通過過孔和連接器來進行，對這樣的情況我們該如何處理？在本章中，我們將通過對封裝、過孔和連接器的研究，闡述其原理，從而指導大家在設計的時候對整個電氣路徑進行完整地分析，即從驅動端內部IC芯片的焊盤到接受器IC芯片的焊盤。
標簽：
High-Speed
Digital
System
desi
上傳時間：
2013-11-24
上傳用戶：maizezhen
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高速數字系統設計下載pdf:High-Speed Digital SystemDesign—A Handbook ofInterconnect Theory and DesignPracticesStephen H. HallGarrett W. HallJames A. McCallA Wiley-Interscience Publication JOHN WILEY & SONS, INC.New York • Chichester • Weinheim • Brisbane • Singapore • TorontoCopyright © 2000 by John Wiley & Sons, Inc.speeddigital systems at the platform level. The book walks the reader through everyrequired concept, from basic transmission line theory to digital timing analysis, high-speedmeasurement techniques, as well as many other topics. In doing so, a unique balancebetween theory and practical applications is achieved that will allow the reader not only tounderstand the nature of the problem, but also provide practical guidance to the solution.The level of theoretical understanding is such that the reader will be equipped to see beyondthe immediate practical application and solve problems not contained within these pages.Much of the information in this book has not been needed in past digital designs but isabsolutely necessary today. Most of the information covered here is not covered in standardcollege curricula, at least not in its focus on digital design, which is arguably one of the mostsignificant industries in electrical engineering.The focus of this book is on the design of robust high-volume, high-speed digital productssuch as computer systems, with particular attention paid to computer busses. However, thetheory presented is applicable to any high-speed digital system. All of the techniquescovered in this book have been applied in industry to actual digital products that have beensuccessfully produced and sold in high volume.Practicing engineers and graduate and undergraduate students who have completed basicelectromagnetic or microwave design classes are equipped to fully comprehend the theorypresented in this book. At a practical level, however, basic circuit theory is all thebackground required to apply the formulas in this book.
標簽：
高速數字
系統設計
上傳時間：
2013-10-26
上傳用戶：縹緲
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OPTOELECTRONICS CIRCUIT COLLECTION
AVALANCHE PHOTODIODE BIAS SUPPLY 1Provides an output voltage of 0V to +80V for reverse biasingan avalanche photodiode to control its gain. This circuit canalso be reconfigured to supply a 0V to –80V output.LINEAR TEC DRIVER–1This is a bridge-tied load (BTL) linear amplifier for drivinga thermoelectric cooler (TEC). It operates on a single +5Vsupply and can drive ±2A into a common TEC.LINEAR TEC DRIVER–2This is very similar to DRIVER–1 but its power output stagewas modified to operate from a single +3.3V supply in orderto increase its efficiency. Driving this amplifier from astandard +2.5V referenced signal causes the output transistorsto have unequal power dissipation.LINEAR TEC DRIVER–3This BTL TEC driver power output stage achieves very highefficiency by swinging very close to its supply rails, ±2.5V.This driver can also drive ±2A into a common TEC. Operationis shown with the power output stage operating on±1.5V supplies. Under these conditions, this linear amplifiercan achieve very high efficiency.
Application ReportThe following collection of analog circuits may be useful in electro-optics applications such as optical networkingsystems. This page summarizes their salient characteristics.
標簽：
光電轉換
電路設計
上傳時間：
2013-10-27
上傳用戶：落花無痕
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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
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介紹高速電路的設計
標簽：
High-speed
Digital
Design
高速數字
上傳時間：
2013-10-16
上傳用戶：yt1993410
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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
-
What would happen if someone connected 24V to your12V circuits? If the power and ground lines were inadvertentlyreversed, would the circuits survive? Does yourapplication reside in a harsh environment, where the inputsupply can ring very high or even below ground? Evenif these events are unlikely, it only takes one to destroya circuit board.
標簽：
敏感電路
保護
過壓
電源反接
上傳時間：
2013-10-26
上傳用戶：jackandlee
