模拟集成电路的设计与其说是一门技术，还不如说是一门艺术。它比数字集成电路设计需要更严格的分析和更丰富的直觉。严谨坚实的理论无疑是严格分析能力的基石，而设计者的实践经验无疑是诞生丰富直觉的源泉。这也正足初学者对学习模拟集成电路设计感到困惑并难以驾驭的根本原因。.美国加州大学洛杉机分校(UCLA)Razavi教授凭借着他在美国多所著名大学执教多年的丰富教学经验和在世界知名顶级公司(AT&T，Bell Lab，HP)卓著的研究经历为我们提供了这本优秀的教材。本书自2000午出版以来得到了国内外读者的好评和青睐，被许多国际知名大学选为教科书。同时，由于原著者在世界知名顶级公司的丰富研究经历，使本书也非常适合作为CMOS模拟集成电路设计或相关领域的研究人员和工程技术人员的参考书。... 本书介绍模拟CMOS集成电路的分析与设计。从直观和严密的角度阐述了各种模拟电路的基本原理和概念，同时还阐述了在SOC中模拟电路设计遇到的新问题及电路技术的新发展。本书由浅入深，理论与实际结合，提供了大量现代工业中的设计实例。全书共18章。前10章介绍各种基本模块和运放及其频率响应和噪声。第11章至第13章介绍带隙基准、开关电容电路以及电路的非线性和失配的影响，第14、15章介绍振荡器和锁相环。第16章至18章介绍MOS器件的高阶效应及其模型、CMOS制造工艺和混合信号电路的版图与封装。 1 Introduction to Analog Design 2 Basic MOS Device Physics 3 Single-Stage Amplifiers 4 Differential Amplifiers 5 Passive and Active Current Mirrors 6 Frequency Response of Amplifiers 7 Noise 8 feedback 9 Operational Amplifiers 10 Stability and Frequency Compensation 11 Bandgap References 12 Introduction to Switched-Capacitor Circuits 13 Nonlinearity and Mismatch 14 Oscillators 15 Phase-Locked Loops 16 Short-Channel Effects and Device Models 17 CMOS Processing Technology 18 Layout and Packaging
上传时间： 2014-12-23
上传用户：杜莹12345
本文将接续介绍电源与功率电路基板，以及数字电路基板导线设计。宽带与高频电路基板导线设计a.输入阻抗1MHz，平滑性(flatness)50MHz 的OP增幅器电路基板图26 是由FET 输入的高速OP 增幅器OPA656 构成的高输入阻抗OP 增幅电路，它的gain取决于R1、R2，本电路图的电路定数为2 倍。此外为改善平滑性特别追加设置可以加大噪讯gain，抑制gain-频率特性高频领域时峰值的R3。图26 高输入阻抗的宽带OP增幅电路图27 是高输入阻抗OP 增幅器的电路基板图案。降低高速OP 增幅器反相输入端子与接地之间的浮游容量非常重要，所以本电路的浮游容量设计目标低于0.5pF。如果上述部位附着大浮游容量的话，会成为高频领域的频率特性产生峰值的原因，严重时频率甚至会因为feedback 阻抗与浮游容量，造成feedback 信号的位相延迟，最后导致频率特性产生波动现象。此外高输入阻抗OP 增幅器输入部位的浮游容量也逐渐成为问题，图27 的电路基板图案的非反相输入端子部位无full ground设计，如果有外部噪讯干扰之虞时，接地可设计成网格状(mesh)。图28 是根据图26 制成的OP 增幅器Gain－频率特性测试结果，由图可知即使接近50MHz频率特性非常平滑，-3dB cutoff频率大约是133MHz。
标签： PCB
上传时间： 2013-11-13
上传用户：hebanlian
Abstract: A resistive feedback network is often used to set the output voltage of a power supply. A mechanical potentiometer (pot)conveniently solves the problem of adjusting a power supply. For easier automatic calibration, a mechanical pot can be replaced witha digital pot. This application note presents a calibration solution that uses a digital pot, because digipots are smaller, do not movewith age or vibration, and can be recalibrated remotely. This proposed solution reduces the susceptibility of the system to thetolerance of the digital pot's end-to-end resistance, making the solution optimal fordesigners. This application note also explainssome of the equations required to calculate the resistor chain values and to use a digital pot in this way. A spreadsheet withstandard reisistor values is available for easy calculations.
上传时间： 2013-10-31
上传用户：caiguoqing
While simplicity and high effi ciency (for cool running) areno longer optional features in isolated power supplies, itis traditionally diffi cult to achieve both. Achieving higheffi ciency often requires the use of advanced topologiesand home-brewed secondary synchronous rectifi cationschemes once reserved only for higher power applications.This only adds to the parts count and to the designcomplexity associated with the reference and optocouplercircuits typically used to maintain isolation. Fortunately, abreakthrough IC makes it possible to achieve both high efficiency and simplicity in a synchronous fl yback topology.The LT®3825 simplifi es and improves the performance oflow voltage, high current fl yback supplies by providingprecise synchronous rectifi er timing and eliminating theneed for optocoupler feedback while maintaining excellentregulation and superior loop response.
上传时间： 2013-10-16
上传用户：wayne595
Telecommunication, satellite links and set-top boxes allrequire tuning a high frequency oscillator. The actualtuning element is a varactor diode, a 2-terminal device thatchanges capacitance as a function of reverse bias voltage.1 The oscillator is part of a frequency synthesizingloop, as detailed in Figure 1. A phase locked loop (PLL)compares a divided down representation of the oscillatorwith a frequency reference. The PLL’s output is levelshifted to provide the high voltage necessary to bias thevaractor, which closes a feedback loop by voltage tuningthe oscillator. This loop forces the voltage controlledoscillator (VCO) to operate at a frequency determined bythe frequency reference and the divider’s division ratio.
上传时间： 2013-12-20
上传用户：ABCDE
<Almost since the introduction of microcontrollers as electronic components there always has been an oscillatorcircuit on the device to make it work. From application point of view only some external components wererequired to make it work. However, to make sure that it will always work required more effort. This report is basedon feedback from the market from customers applying 8-bit mircrocontrollers.>
标签： oscillators X-tal bit mic
上传时间： 2013-11-12
上传用户：穿着衣服的大卫
This application note describes how to build a system that can be used for determining theoptimal phase shift for a Double Data Rate (DDR) memory feedback clock. In this system, theDDR memory is controlled by a controller that attaches to either the OPB or PLB and is used inan embedded microprocessor application. This reference system also uses a DCM that isconfigured so that the phase of its output clock can be changed while the system is running anda GPIO core that controls that phase shift. The GPIO output is controlled by a softwareapplication that can be run on a PowerPC® 405 or Microblaze™ microprocessor.
上传时间： 2013-10-15
上传用户：euroford
机电类比法是一种把机械量通过一定的计算等效类比为电量的方法，其在对电子机械系统的分析中应用非常广泛。它能够把一个较复杂的机械系统类比为我们熟知的电路系统来进行分析，从而使问题的分析得到简化。本文通过对振弦式传感器的分析介绍了机电类比法，并对使用电路进行了相关的分析。 Summary：The electromechanical analogy is assort of analysis which is to analogize the mechanical system by using circuit system , it applied widely in the filed of analysis the electronic-mechanical system. The analysis can take a complex mechanical system analogous to a circuitry that we well-known, which can simplify the problems. In the paper, the electro-mechanical analogy method is briefly introduced by analysis the vibrating wire sensor，and have a correlation analysis about the circuit we used.关键词： 机电类比法 振弦式传感器 频率 振荡 反馈Keyword：electro-mechanical analogy method，vibrating wire sensor，frequency, oscillation, feedback 0 引言振弦式传感器是属于频率式传感器的一种。所谓频率式传感器就是能直接将被测量转换为振动频率信号的传感器，这类传感器一般是通过测量振弦、振筒、振梁、振膜等弹性振体或石英晶体谐振器的固有谐振频率来达到测量引起谐振频率变化的被测非电量的目的，其也称为谐振式传感器[1]。在分析该类传感器中，由于其涉及到频率，就容易让人联想到在电子技术中接触到的RLC振荡电路。因此可以尝试着用类比的方法使之对应起来分析,即机电类比法分析。
上传时间： 2013-11-16
上传用户：paladin
This application note describes how to build a system that can be used for determining theoptimal phase shift for a Double Data Rate (DDR) memory feedback clock. In this system, theDDR memory is controlled by a controller that attaches to either the OPB or PLB and is used inan embedded microprocessor application. This reference system also uses a DCM that isconfigured so that the phase of its output clock can be changed while the system is running anda GPIO core that controls that phase shift. The GPIO output is controlled by a softwareapplication that can be run on a PowerPC® 405 or Microblaze™ microprocessor.
上传时间： 2014-11-26
上传用户：erkuizhang
本文将接续介绍电源与功率电路基板，以及数字电路基板导线设计。宽带与高频电路基板导线设计a.输入阻抗1MHz，平滑性(flatness)50MHz 的OP增幅器电路基板图26 是由FET 输入的高速OP 增幅器OPA656 构成的高输入阻抗OP 增幅电路，它的gain取决于R1、R2，本电路图的电路定数为2 倍。此外为改善平滑性特别追加设置可以加大噪讯gain，抑制gain-频率特性高频领域时峰值的R3。图26 高输入阻抗的宽带OP增幅电路图27 是高输入阻抗OP 增幅器的电路基板图案。降低高速OP 增幅器反相输入端子与接地之间的浮游容量非常重要，所以本电路的浮游容量设计目标低于0.5pF。如果上述部位附着大浮游容量的话，会成为高频领域的频率特性产生峰值的原因，严重时频率甚至会因为feedback 阻抗与浮游容量，造成feedback 信号的位相延迟，最后导致频率特性产生波动现象。此外高输入阻抗OP 增幅器输入部位的浮游容量也逐渐成为问题，图27 的电路基板图案的非反相输入端子部位无full ground设计，如果有外部噪讯干扰之虞时，接地可设计成网格状(mesh)。图28 是根据图26 制成的OP 增幅器Gain－频率特性测试结果，由图可知即使接近50MHz频率特性非常平滑，-3dB cutoff频率大约是133MHz。
标签： PCB
上传时间： 2013-11-09
上传用户：z754970244
