A POST-SCF STUDY ON THE EXCITED STATES OF MgH_2

The calculations on the ground state and two excited states3B2,BIB2 of MgH2 system are carried out by using (Second Order Configuration Interaction)method.For each state,the electronic structure and related properties are investigated,The vibration and localization analyses are also performed.The reasonable explanations of bending geometries for the excited states are given.

开关电容滤波器前置、后置滤波器的设计

如何为开关电容滤波器(SCF)合理配置前置、后置滤波器,一直缺少系统的分析和说明。在研究SCF工作特性的基础上,提出了SCF前置、后置滤波器的设计方法。SFC前置、后置滤波器的主要设计参数是转角频率和衰减量。设计时,先根据系统要求确定衰减量,再根据选定的滤波器结构的衰减系数确定转角频率。用此方法,结合12位数据采集系统需要,以MAX295为核心设计了一个可程控低通滤波器。结果表明,MAX295的前、后置滤波器能以4档转角频率覆盖其10 Hz^50 kHz转角频率范围,前、后置滤波器的最小衰减量分别为-74 dB和-10 dB。