Subsequently , the theory of lna and the popular design methods are introduced . after that , the lna scheme analysis , implementation of each characteristic and some questions paid more attention to in system design and tuning are discussed in detail . the ultimate testing results of this subject are represented at last 本文首先对雷达接收机的组成和主要质量指标进行了介绍分析,然后详细论证了本项目接收机系统所采用的方案,接下来介绍了低噪声放大器理论和现今流行的设计方法,并详尽论述了本项目中低噪放所采用的设计方案、具体性能指标的实现以及在设计与实现中应该注意的问题,最后给出产品的测试结果。
Concerning the power amplifier and the low noise amplifier , in the whole course of design , simulation , debugging , testing etc . work of 4 aspects is chiefly carried out as follows : 1 . analysis the difference between gain - matching and power ? matching in amplifier , explain the importance of power - matching design method in high power and high linearity pa design . 2 围绕功放和低噪放的设计、仿真、调试和测试过程中,主要开展了以下几方面的工作: 1 .分析在放大器设计中增益匹配与功率匹配两种方法之间的差异,说明功率匹配方法对于功率放大器尤其是大功率线性功放的重要性。
Product description : this series product has entire auto - lubrication systems and the ordinary two big kinds supplies to select , this machine major parts cancels the needle , cam and the ball bearing all uses the high quality import components , also selects the high quality steel products quenching heat treatment to the main stress components , the essential components uses special phosphorus processing , the foreign dew components all adopts special - purpose seal - up device and drains the oil the measure , therefore , entire causes machine throughout to locate the lubrication is reliable , the revolution is steady , under the high speed low chirp condition works 本系列产品具有全自动润滑型及普通型两大类以供选用，本机主要零件勾针，凸轮及滚珠均采用优质进口零件，对主要受力零件亦选用优质钢材淬火热处理，关键零件则采用专门磷化处理，对外露零件均采取专用密封装置及排油措施，因此，使整机始终处于润滑可靠，运转平稳，高速低噪的条件下工作。
These years along with the development of power - electronics technique and micro - control technique , permanent magnetic brushless dc motor is characterized by small volume , light weight , high efficiency , low noises , big stand - alone capability and reliability appeared and matured . so it is hopeful to become new generation submarine propulsion motor 近年来随着电力电子技术和微控制技术的迅猛发展而成熟起来的永磁无刷直流电机具有体积小、重量轻、高效低噪、单机容量大且可靠性高的特点，从而极有希望成为新一代潜艇推进电机。
The products are popular at home and in the southeast asia , middle - east , south america and western europe . the products are famous in zhejiang province for they have the advantages of reasonable design , original structure , high efficiency , low noise and energy - saving function 公司管理科学，技术力量雄厚，产品设计合理，结构新颖，高速高效，低噪节能，产品质量受iso9002国际标准质量保证体系控制，享誉国内，并远销东南亚、中东、南美和西欧等市场，是浙江省名牌产品。
