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cad
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  cad
In the application of CAD/CAM, the target form of a curve, which is used for plotting or as the data supplied for CAM, is a set of points on (or near by) the curve.
      
The results show that the method is not only simple, feasible and reliable but also compatible with a CAD system using NURBS.
      
To design various optimum parameters and simulate the working process of CP single-screw compressor, the Computer-Aided Design (CAD) system for the CP single-screw compressor has been established.
      
A new method based on computer graphics technology, database technology, object-oriented programming technology, and visual simulation technology has been adopted in this CAD system.
      
The experimental results show that the CAD system for the CP single-screw compressor is practical and feasible.
      
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As a part of the LSI CAD, a software for CAD photomask-ZB-761 was designed and put into use on a DJS-130 computer in 1976. Since then several dozens of IC photomasks have been made. The input language of software has better ability to describe IC mask graph. The data structure is so designed that it enables a minicomputer without an external memory, such as a DJS-130 computer, to handle the vast data of mask graph. By optimizing the object program the working time of specific photomask equipment...

As a part of the LSI CAD, a software for CAD photomask-ZB-761 was designed and put into use on a DJS-130 computer in 1976. Since then several dozens of IC photomasks have been made. The input language of software has better ability to describe IC mask graph. The data structure is so designed that it enables a minicomputer without an external memory, such as a DJS-130 computer, to handle the vast data of mask graph. By optimizing the object program the working time of specific photomask equipment is greatly reduced. It also has the ability to check data and to perform manmachine dialogue to a certain extent. In this paper, the particular features of input language, data structure, transformation algorithm of the compiler and optimization for the object program etc. are described in some detail. The schemes of the implementation of LSI mask design automation are also suggested.

计算机辅助制版软件ZB-761是作为大规模集成电路计算机辅助设计的一个组成部分而设计的,且于1976年在DJS-130计算机上投入运行。至今已制作了数十套集成电路掩膜版。 软件的输入语言具有较强的描述集成电路版图的能力。其数据结构使得像DJS-130这样的小型计算机(没有外存贮器)能处理大量的版图数据。由于进行了目标程序的优化,使得专用制版设备的制版时间大大地缩短了。另外,软件还具有一定的数据检查和人机对话的能力。 本文较详细地介绍了软件输入语言的特点,数据结构,编译中的变换算法和目标程序的优化等。并对大规模集成电路版图设计自动化提出了一些设想。

This is a summary of CAD/CAM in manufacture engineering. In pant Ⅰ a general review of application of computer in mechnical engineering and discription of CAD/CAM system is given. In part Ⅱ a definition, situation of CAD and computertechnique for CAD are descripted. Part Ⅲ discusses centent, situation of CAM and computer technique for CAM.Finally some developments of CAD/CAM in manufactureengineeringare considered.

本文对机械制造工业自动化技术——计算机辅助设计和辅助制造在国外的现状和发展进行了综述。概论中简介了这种技术在机械制造工业自动化中的作用。第二部分叙述了CAD的含义、现状,所要求的计算机技术以及国外应用CAD技术的几方面的情况。第三部分讨论了CAM的含义、现状和所要求的计算机技术。最后就国外技术预测叙述了今后的发展。

In this paper, we present a concise device physics theory for I2L family. The core of the integrated injection logic family which includes I2L, I3L, S2L, SFL, SI2L and 3JL etc., is composed of three mutually interactive PN junctions.By making use of the'Total Number of Excess Minority Carriers"mothod, and starting from the integral form of the continuity equation, we shall relate the terminal current of I2L with the total mumber of excess carriers, which are functions of the junction voltages. The theory can...

In this paper, we present a concise device physics theory for I2L family. The core of the integrated injection logic family which includes I2L, I3L, S2L, SFL, SI2L and 3JL etc., is composed of three mutually interactive PN junctions.By making use of the'Total Number of Excess Minority Carriers"mothod, and starting from the integral form of the continuity equation, we shall relate the terminal current of I2L with the total mumber of excess carriers, which are functions of the junction voltages. The theory can be used to compute the recombination losses of various regions. The culculated results can be used to understand and to design the I2L family, and the parameters are also measurable from the circuit characteristic point of view.Taking the I2L LSI or VLSI as a single device, We can specify and measure the static input and output characteristics.It exhibits various regions of operation.For each of these various modes of operation, we can simplify the analysis, and obtain, with appropriate approximation, simple equivalent circuits, which can be used for CAD.The Eber-Moll and Gummel-Poon models are useful for junction transistors. However, these models are insufficient for three mutually interactive junctions. Especially for the dynamic behavior of I2L, it is necessary to consider the building up or decaying of the "Total Number of Excess Carriers" in the entire I2L. The charging and discharging currents are no more constants as that has been assumed in the "Charge control" theory. Simplified equations will be given for the dynamic analysis of I2L. This analysis provides useful basic principles for the device design theory and the circuit design theory.

本文叙述了注入型电路的器件物理。注入型电路包括I~2L、I~3L、S~2L、SFL、SI~2L以及3JL等,它们的核心是三个相互作用的PN结。 采用“过剩少数载流子总量”的方法,从电流连续方程的积分形式入手,给出了注入型电路端点电流与“过剩少数载流子总量”,以及端点电压之间的关系,由此可以计算出各区域的复合损失。计算结果可用来理解和设计注入型电路。从线路的角度来看,这些参数也可直接测得。 文中给出了可测的注入型大规模集成电路的静态输入和输出特性曲线族。这些特性曲线族包括了各种工作区。对于各种工作区域,可简化为简单的等效电路,用来进行线路和器件的设计,也可用于计算机辅助设计。 E-M和G-P模型对于描述结型晶体管是很完善的,但是不能充分描述三个结之间的相互作用。因此,特别是对于注入型电路的动态分析,还须考虑注入型电路各区域的“过剩少数载流子总量”的建立和消失过程,这时充、放电电流都已不是常数。本文给出了简化的动态分析方程,这些方程有助于器件和线路的设计。

 
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