短波宽带大动态射频信道的设计

摘要

根据现代电子侦察系统的要求,结合现有的工程实现技术,研制了短波宽带数字侦察接收机.讨论了适用于大动态、高线性的射频信道的电路结构及性能特点.综合考虑了接收机的噪声系数、增益和动态范围,仔细选择所有元器件,研究了射频信道各部分的指标分配与整机性能指标优化设计,提出了自动增益控制扩展总动态的实现方案.在接收机高线性和大动态范围的设计与具体电路实现上具有一定的创新与独到之处.实验证明接收机具有85 dB的动态范围,满足短波宽带电子侦察系统设计指标要求.%According to the requirement of modern electronic reconnaissance system, a short wave widehand digital reconnaissance receiver is designed based on the state of arts engineering implementation techniques. The architecture and features of the analog forepart circuit with wide dynamic range and high linearity are discussed. It must be weighed that the noise figure, gain and dynamic range, and all elements of the configuration must be chose carefully. The method of parameters allocation and optimization of the analog forepart circuit are studied. This paper presents a method for improving dynamic range by means of Automatic Gain Control system. There are some innovations in the design of high linearity and high dynamic range, also in the circuitry realization. It is proved that the device has a dynamic range of 85dB by experiments. The device satisfies electronic reconnaissance system's needs.