协和PG003C中英文寻呼机接收机设计概述

文中先根据以前市面上性能最优的Ｍｏｔｏｒｏｌａ顾问型中文机为目标，结合协和第一、二代中文寻呼机接收电路的研究成果，制定了自己产品的技术性能要求，对寻呼接收机电路和天线的方案进行了探讨，指出选用的双环天线的优点及其增益估算的方法，说明了选用二次变频外差式接收电路是为了保证有较高的灵敏度和批量生产的灵活性。接着从提高灵敏度的角度，对接收机各级电路的增益和噪声系数分配及ＬＮＡ电路的确定进行了讨论。最后给

Review about Receiver Design of Concord Chinese-English Pager

This paper is the conclusion of the receiver of the concord chinese pager model PG003C which had the honor to get the first class award of Zhuhai 94's science and technology advanced, We discuss the scheme of pager receiver circuit and antenna in this paper first.We point out the doudle loops small size antenna and the hererodyne receiver circuit have many merits,that's why we have used the doudle loops antenna and hererodyne circuit in mode1PG003C.Secend,we bring up the plan of the gains and noise figures assignment berween the different levels circuits inaccordance with SENSITIVITY.On another side,we have used the isolation technique which is often used in the satellite receiver to reject the interference of the image frequency.The model PG003C's performence is superior that had been approved by the Ministry of Post and Telecommunication's modile communication equipment's quality administration and examination center.