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lumped

  • wave port和lumped port的区别

    hfss仿真中会遇到wave port和lumped port的选择,如何根据仿真内容选择?笔记中详细说明

    标签: port lumped wave

    上传时间: 2017-10-18

    上传用户:Frederick

  • 射频集成电路设计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.

    标签: Rogers Radio John Freq

    上传时间: 2014-12-23

    上传用户:han_zh

  • 传输线

    第一章  传输线理论一  传输线原理二  微带传输线三  微带传输线之不连续分析第二章  被动组件之电感设计与分析一  电感原理二  电感结构与分析三  电感设计与模拟四  电感分析与量测传输线理论与传统电路学之最大不同,主要在于组件之尺寸与传导电波之波长的比值。当组件尺寸远小于传输线之电波波长时,传统的电路学理论才可以使用,一般以传输波长(Guide wavelength)的二十分之ㄧ(λ/20)为最大尺寸,称为集总组件(lumped elements);反之,若组件的尺寸接近传输波长,由于组件上不同位置之电压或电流的大小与相位均可能不相同,因而称为散布式组件(Distributed elements)。 由于通讯应用的频率越来越高,相对的传输波长也越来越小,要使电路之设计完全由集总组件所构成变得越来越难以实现,因此,运用散布式组件设计电路也成为无法避免的选择。 当然,科技的进步已经使得集总组件的制作变得越来越小,例如运用半导体制程、高介电材质之低温共烧陶瓷(LTCC)、微机电(MicroElectroMechanical Systems, MEMS)等技术制作集总组件,然而,其中电路之分析与设计能不乏运用到散布式传输线的理论,如微带线(Microstrip Lines)、夹心带线(Strip Lines)等的理论。因此,本章以讨论散布式传输线的理论开始,进而以微带传输线为例介绍其理论与公式,并讨论微带传输线之各种不连续之电路,以作为后续章节之被动组件的运用。

    标签: 传输线

    上传时间: 2014-01-10

    上传用户:sunshie

  • 阻抗匹配

    阻抗匹配  阻抗匹配(Impedance matching)是微波电子学里的一部分,主要用于传输线上,来达至所有高频的微波信号皆能传至负载点的目的,不会有信号反射回来源点,从而提升能源效益。  大体上,阻抗匹配有两种,一种是透过改变阻抗力(lumped-circuit matching),另一种则是调整传输线的波长(transmission line matching)。  要匹配一组线路,首先把负载点的阻抗值,除以传输线的特性阻抗值来归一化,然后把数值划在史密夫图表上。  把电容或电感与负载串联起来,即可增加或减少负载的阻抗值,在图表上的点会沿著代表实数电阻的圆圈走动。如果把电容或电感接地,首先图表上的点会以图中心旋转180度,然后才沿电阻圈走动,再沿中心旋转180度。重覆以上方法直至电阻值变成1,即可直接把阻抗力变为零完成匹配。  由负载点至来源点加长传输线,在图表上的圆点会沿著图中心以逆时针方向走动,直至走到电阻值为1的圆圈上,即可加电容或电感把阻抗力调整为零,完成匹配.........

    标签: 阻抗匹配

    上传时间: 2013-11-13

    上传用户:ddddddos

  • 差分電路中單端及混合模式S-參數的使用

    Single-Ended and Differential S-Parameters Differential circuits have been important incommunication systems for many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the frequency of operationincreasing beyond 1GHz, and above 1Gbps fordigital communications, this lumped-elementapproach is no longer valid, because the physicalsize of the circuit approaches the size of awavelength.Distributed models and analysis techniques are nowused instead of lumped-element techniques.Scattering parameters, or S-parameters, have beendeveloped for this purpose [1]. These S-parametersare defined for single-ended networks. S-parameterscan be used to describe differential networks, but astrict definition was not developed until Bockelmanand others addressed this issue [2]. Bockelman’swork also included a study on how to adapt single-ended S-parameters for use with differential circuits[2]. This adaptation, called “mixed-mode S-parameters,” addresses differential and common-mode operation, as well as the conversion betweenthe two modes of operation.This application note will explain the use of single-ended and mixed-mode S-parameters, and the basicconcepts of microwave measurement calibration.

    标签: 差分電路 單端 模式

    上传时间: 2014-03-25

    上传用户:yyyyyyyyyy

  • 传输线

    第一章  传输线理论一  传输线原理二  微带传输线三  微带传输线之不连续分析第二章  被动组件之电感设计与分析一  电感原理二  电感结构与分析三  电感设计与模拟四  电感分析与量测传输线理论与传统电路学之最大不同,主要在于组件之尺寸与传导电波之波长的比值。当组件尺寸远小于传输线之电波波长时,传统的电路学理论才可以使用,一般以传输波长(Guide wavelength)的二十分之ㄧ(λ/20)为最大尺寸,称为集总组件(lumped elements);反之,若组件的尺寸接近传输波长,由于组件上不同位置之电压或电流的大小与相位均可能不相同,因而称为散布式组件(Distributed elements)。 由于通讯应用的频率越来越高,相对的传输波长也越来越小,要使电路之设计完全由集总组件所构成变得越来越难以实现,因此,运用散布式组件设计电路也成为无法避免的选择。 当然,科技的进步已经使得集总组件的制作变得越来越小,例如运用半导体制程、高介电材质之低温共烧陶瓷(LTCC)、微机电(MicroElectroMechanical Systems, MEMS)等技术制作集总组件,然而,其中电路之分析与设计能不乏运用到散布式传输线的理论,如微带线(Microstrip Lines)、夹心带线(Strip Lines)等的理论。因此,本章以讨论散布式传输线的理论开始,进而以微带传输线为例介绍其理论与公式,并讨论微带传输线之各种不连续之电路,以作为后续章节之被动组件的运用。

    标签: 传输线

    上传时间: 2013-11-10

    上传用户:潇湘书客

  • 阻抗匹配

    阻抗匹配  阻抗匹配(Impedance matching)是微波电子学里的一部分,主要用于传输线上,来达至所有高频的微波信号皆能传至负载点的目的,不会有信号反射回来源点,从而提升能源效益。  大体上,阻抗匹配有两种,一种是透过改变阻抗力(lumped-circuit matching),另一种则是调整传输线的波长(transmission line matching)。  要匹配一组线路,首先把负载点的阻抗值,除以传输线的特性阻抗值来归一化,然后把数值划在史密夫图表上。  把电容或电感与负载串联起来,即可增加或减少负载的阻抗值,在图表上的点会沿著代表实数电阻的圆圈走动。如果把电容或电感接地,首先图表上的点会以图中心旋转180度,然后才沿电阻圈走动,再沿中心旋转180度。重覆以上方法直至电阻值变成1,即可直接把阻抗力变为零完成匹配。  由负载点至来源点加长传输线,在图表上的圆点会沿著图中心以逆时针方向走动,直至走到电阻值为1的圆圈上,即可加电容或电感把阻抗力调整为零,完成匹配.........

    标签: 阻抗匹配

    上传时间: 2013-10-20

    上传用户:ZOULIN58