As a new bus standard in computer peripheral hardware , usb is adopted and widely used in virtual instruments for its ease of use , true plug and play , power supply from bus , high transmission speed , etc . the purpose of this project is to design and develop a virtual instrument that can test and display semiconductor transistor output characteristics curve , instead of tradition instrument which has being used in labs by now 而usb总线作为一种新兴的计算机外设总线标准,由于易用、支持热插拔、总线供电、传输速率高等特点,已经在虚拟仪器当中得到采纳与普及。本文介绍了一种实现晶体管特性曲线测量的虚拟测试仪器的设计和制作方案,其可用来取代目前在实验室中使用的老式的晶体管特性图示仪。
Usb2 . 0 ( universal serial bus ) is nowadays becoming a standard of the personal computer peripheral interface , due to that , lots of novel devices emerged , such as mobile hard disk , flash memory etc . however , the key technology of usb2 . 0 interface is only possessed by a few companies abroad such as intel , philips , while blank in china Usb2 . 0 (通用串行总线)是目前pc外设接口的标准,也正是因为usb接口出现,才诞生了诸如移动硬盘、闪存等一批新颖的外设。但是usb2 . 0接口技术在国内还是一片空白,只被包括intel , philips等少数国外大型半导体厂商占有。
As a new interface caters for rapid development of computer peripheral equipment , universal serial bus ( for short usb ) dispels astriction of communication through traditional serial port and parallel port . it is very suitable for real time image data transmission , which requires high speed . this theme describes two - circuit systems , which utilize usb interface to data from a digital image sensor to pc 为了迎合计算机上设的快速发展以及消除计算机外设通过串、并口的通讯的局限性,出现了新的计算机外设接口usb (通用串行总线) ,这种新型接口对于实时的视频传输很适用,本文设计了两套电脑眼基于ez - usb2131q的usb接口系统。
The key products of group are series of crt , tft - lcd monitors , signal devices , computer peripheral equipmemt , diesel engines , injection parts used for computer , household appliances and vehicle , " fengwa " brand series industrial and civil paints , network projects , software development and smart card etc 北泰方向集团的主导产品为各类crt 、 tft - lcd电脑显示器、各类监视器及电脑周边产品,各类柴油机,为计算机、家电、汽车配套的注塑制品, “蜂娃”牌系列工用、民用油漆、网络工程、软件开发、智能卡等。