Nowadays , ic becomes literally the foundation of our digital world , many important technologies , such as , computers , communications , internet , manufacturing and transport systems , are based on the development of ic 今天, ic产业已经成为现代工业发展的基石,其应用涵盖了计算机,通讯,互联网,制造业等。因此,对于芯片的要求不断地提高,向着高集成,低功耗,高频的方向发展。
The main research contents of this dissertation are shown in the following : ( 1 ) introduce one method of use the counting pulse to develop ie measuring system and new method of using the high frequency clock signal to divide the space pulse 本文主要研究内容如下: ( 1 )系统论述了一个脉冲计数方式的ie测量系统的测量原理,阐述了一个采用高频的时钟信号细分空间脉冲的新型细分方法。
In this paper , they are set forth at first that the kinds of computer - simulation of electronic devices , the development and the requirements of mosfet ' s model and the way of gain the models " parameters , , the dc models have been bui it in chapter 2 and the models of big signals have been deduced in chapter 3 , they are different from the equivalent circuit models in the traditional software pspice that they come from the numer i ca i - s i mu i at i on wh i ch is based on the essence equat i on , so the precision of simulation is enhanced ? mosfet ' s small signal models of low frequency , intermediate frequency and high frequency have been built in chapter 4 and chapter 5 , although the equivalent circuit models in pspice are used for reference to bui id them , they have their own characteristics which are analyzed at a i i kinds of situations , so that the simulation software for mosfet can be written according them and it i s a i so benef i c i a i for us to catch the gen i us character i st i cs of mosfet and to d esign all kinds of applicable devices the correctness of the models is simply proved in chapter 6 本文首先介绍了电子器件计算机模拟的分类、 mosfet的建模发展动态、对器件模型的要求以及模型参数的提取方法。在第二章中建立了mos晶体管在直流端电压条件下的工作模型；第三章推导了mosfet的大信号模型，这两类模型不同于传统模拟软件例如pspice中的等效电路模型，而是从模型方程出发，采用数值模拟的方法，提高了模拟的精度。第四章和第五章分别建立了mos晶体管低频、中频、高频的小信号模型，虽然借鉴了pspice模拟软件中用等效电路模型的方法，但是本文分别讨论了准静态和非准静态时器件的本征部分以及包含非本征部分工作于低频、中频和高频条件时的模型，可以根据这些模型编写相应的模拟软件，这样在做器件的模拟分析与器件设计的时候，就可以利用模拟软件逐步深入地分析器件在不同的条件下和器件的不同部分在工作时的各种小信号特性，有利于抓住器件工作的本质特性，设计出符合要求的各类通用和特殊器件。
With the development of electronic technology in the field of high - frequency and high - power , power mosfet is gradually enhancing its important status in semiconductor apparatus and is being widely applied in power converters as switch . with the increasing of the operating frequency ( > 200khz ) , the energy loss caused by parasitic capacitance will affect the efficiency of power transforming in converters . especially in the applications of high frequency power supply using mosfet as main devices ( the unit of frequency is mhz ) , the energy loss caused by the switch process will badly affect its efficiency 随着电力电子技术进一步向高频的大功率用电领域发展，功率mosfet在各种电力半导体器件中的重要地位日益显著，使用功率mosfet作为开关器件的功率转换电路也日益增多，但随着器件开关频率的提高(大于200khz ) ，由器件极间电容引起的能量损耗将会影响到功率转换电路的能量传输效率，特别是在以mosfet作为开关器件的高频感应加热电源中(工作频率可达兆赫) ， mosfet在开关过程中的能量损耗严重影响到电源的效率，因此如何减小开关器件的损耗提高高频功率转换线路的效率成为电力电子技术领域的重要研究课题之一。
Do not be misled , doctors believe they are well informed and will not know about such activities , as well many prestigious authorities are aware that there is high environmental levels of radio frequency energy but even they are well behind the times in finding out the facts 不要被这些症状所误导，医生相信他们见多识广，并且将无法知道关于这样的活动，也有许多声望很高的权威意识到，这是处于一种高频的无线电波频率的环境内，而且甚至他们很好的在背后以找出事实。
Now the development in radio communication system and sensors productively need saw devices of high performance and high frequency . but electromagnetic interference of saw device is evident day and day . so the saw device technologies of the electromagnetic interference and electromagnetic compatibility in its process of design , fabrication and production must be considered . the demand request saw designer of second order effects which are not considered in low frequency 当前在无线通信系统和传感器方面的进展预示了需要高性能、高频的saw器件，但是随着其工作频率的提高， saw器件电磁干扰问题日益突出，因此saw其电磁兼容技术在设计、研制和生产过程中是必须考虑的。
( 2 ) our experimental results have shown the topographycal distribution of the cfs of neurons in a - 1 . generally the neurons with high cfs laid in the rostral part of a - 1 , and the neurons with low cfs laid in its caudal part . the similar isofrequency strip was observed in a - i cortex (二)大鼠皮层a区听神经元的特征频率( cf )分布具有分域特性， cf为高频的神经元分布在a区嘴侧， cf为低频的神经元分布在a区尾侧，实验还发现在a区的内外侧方向有类似的等频带存在。
The specific route is as follows : firstly , the output signals from the multipath sensor are nornalized , i . e . , all sensor signals ( including the analog data ) are transformed into multipath square wave pulse signals to form multipath parallel condition codes . these codes are treated as input signals for dac to obtain a series of dispersed analog signals for output as input signals for the vco . finally , a high frequency modulation signal is conducted at the vco ' s output 具体技术路线如下：先将由多路传感器输出的信号进行归一化处理，即将所有传感器信号(包括模拟量)转换成多路方波脉冲信号，以形成多位并行信号的状态码，将其作为dac的数据输入信号，从而得到一系列离散的模拟信号输出，作为vco的输入信号，最终在vco输出端形成高频的调制信号。
Then , fuse the decomposed wavelet coefficients as follow rules : for detail wavelet coefficients , we introduce the color composition ( cc ) into local deviation ( ld ) fusion method , and propose a local compensation ( lc ) fusion rule ; and for approximate wavelet coefficients , we combine cc with high pass filtering ( hpf ) , to propose a high - pass - filtering compensation ( hc ) fusion rule 然后,按如下规则进行小波分解系数的融合:对高频小波系数,将颜色补偿( cc )法引入到局部方差( ld )融合法中,形成高频的局部补偿融合( lc )准则;对低频小波系数,将颜色补偿法( cc )和高通滤波( hpf )融合方法结合起来,形成低频的高通补偿( hc )融合准则。
