The exportation resistance of a device work device with what link after loading the resistance s the certain connections for should satisfying , in order to prevent mount to load the appearance produce the obvious influence . with each other connect to say to electronics equipments , for example after signal connect the enlarger , ex - class to connect class , only behind first - degree importation resistance before larger than first - degree exportation resistance 5 - 10 times are above , can think the resistance to match good ; connect the box come saying , electronics tube the machine should choose to use with for the enlarger its output to carry the mark to call the resistance the box for , but transistor enlarger then have noing this restrict , can take officing why resistance of equal or approximate box 一件器材的输出阻抗和所连接的负载阻抗之间所应满足的某种关系，以免接上负载后对器材本身的工作状态产生明显的影响。对电子设备互连来说，例如信号源连放大器，前级连后级，只要后一级的输入阻抗大于前一级的输出阻抗5 - 10倍以上，就可认为阻抗匹配良好对于放大器连接音箱来说，电子管机应选用与其输出端标称阻抗相等或接近的音箱，而晶体管放大器则无此限制，可以接任何阻抗的音箱。
This effects can be explained as follows : the radiation conditions are actually impedance matching condition in terms of microwave network , for a fixed dimension of a resonator and output transformer , only below the critical plasma density " , the matching condition can be satisfied in the smith circle map 我们提出，这一现象可从阻抗匹配的角度来解释。对于一确定尺寸的腔体、阻抗变换器，存在一个等离子体密度的临界值，只有在等离子体密度低于这个临界值时，腔体的输出阻抗和波导的特性阻抗才能满足匹配，即满足所谓的辐射条件。
Compared with the similar research results , the weighted control ic here has the following characteristics : ( 1 ) the circuit structure is simpler ; ( 2 ) the chip ' s fabrication is compatible with standard cmos process ; ( 3 ) n - mosfets with high w / l ratio and short channels are used for weighting and output to reduce the insertion loss ; ( 4 ) the weighting factor varies in a relatively wide range with the controlling signals ; ( 5 ) input and output impedance approach 50 in low frequency ( e . g . 50mhz ) , while in higher frequency they slightly deviate from 50 , hence the energy reflection lower than 0 . 1 ; ( 6 ) it completes the functions of sampling , weighting , controlling and summing of high frequency analog signals 它的加权控制电路与已报道的相关电路相比具有如下特点：电路结构简单；制造工艺与普通cmos工艺兼容：短沟道，高宽长比的nmos晶体管具有低的通导电阻，将其作为加权、输出器件可降低由电路引起的插入损耗；改变加权信号，可实现权值在较大范围内的连续变化；输入、输出阻抗在低频(如50mhz )下接近50 ，而在高频下略有偏离50 ，但反射系数均低于0 . 1 ；实现了对高频信号的取样、加权、控制、叠加功能的迭加。
Some of researchs of the dc source system are introduced in the thesis . the main contents are follows : firstly , a kind of dc source system based on the distributed system is given . secondly , the design and realization of the switching source charger with phase - shifted zero - voltage - switching converter is discussed particularly . then the analysis of the control system of the charger is processed and a way of current sharing composed of the droop method and the master - slave method based on the random switching of the master is givea thirdly , the design and realization of each measure and control unit isintroduced 本论文介绍了作者研究和开发直流电源系统的若干成果，主要有：给出了一种基于分布式架构的直流电源系统；详细介绍了全桥移相零电压软开关高频开关电源充电机的设计和实现过程，对充电机的控制实现过程进行了详细分析，提出一种输出阻抗法和主机随机转换的主从法相结合的均流方法；对直流电源监控系统各个前级测控单元的设计和实现进行了分析，重点介绍了蓄电池巡检单元、绝缘检测单元、母线调压单元的设计和实现过程；开发了一个基于组态软件构架的直流电源系统后台监控软件；最后介绍了在开关电源、通讯、单片机系统设计中采取的一些抗干扰措施。
