巧用“虚短”和“虚断”分析电路谐振

众所周知,“虚短”和“虚断”是模拟电子技术中分析运放电路的重要手段.然而,作者在多年的教学与实践中发现,该方法同样可以巧妙地用于“电路分析基础”中谐振相关问题的分析,而且该技巧简单直观,可以免去复杂的复数运算,应用起来方便快捷.本文通过理论分析和实例验证了所提方法的有效性,在相关电路分析中具有一定的价值.

“虚短”和“虚地”在集成运放中的应用

本文对“虚短”和“虚地”的含义是什么,它们之间有什么联系与区别,运放在什么条件下”虚短”,什么条件下“虚地”,如何利用它们来解决实际问题,作了系统阐述.

《电子技术基础》(二)自测练习题(2)

1.要使该电路的级间反馈为负反馈,集成运放的反相输入端应接哪个三极管的集电极?2.判断该反馈的组态;

Calibration of parallel kinematics machine using generalized distance error model

This paper focus on the accuracy enhancement of parallel kinematics machine through kinematics calibration. In the calibration processing, well-structured identification Jacobian matrix construction and end-effector position and orientation measurement are two main difficulties. In this paper, the identification Jacobian matrix is constructed easily by numerical calculation utilizing the unit virtual velocity method. The generalized distance errors model is presented for avoiding measuring the position and orientation directly which is difficult to be measured. At last, a measurement tool is given for acquiring the data points in the calibration processing. Experimental studies confirmed the effectiveness of method. It is also shown in the paper that the proposed approach can be applied to other typed parallel manipulators.