全集成抗阻塞射频接收系统的设计方法及电路实现研究

项目名称： 全集成抗阻塞射频接收系统的设计方法及电路实现研究

项目编号： No.61574035

项目类型： 面上项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 吴建辉

作者单位： 东南大学

项目金额： 16万元

中文摘要： 随着无线通讯网络的发展，因频谱资源的有限性，不断增加的通信标准和用户终端使无线信道变得越来越拥挤,进而可能产生阻塞现象，接收系统可能发生提前饱和或产生再生频谱覆盖有用信号，造成接收信号丢失。阻塞信号通常因过于靠近目标信道而无法通过LC滤波器滤除。高Q值SAW滤波器虽可有效抑制阻塞信号，但其缺乏调谐能力并且无法实现全集成。近年来，基于阻塞信号抵消的全集成抗阻塞思路的提出得到了业界关注，然而受结构和电路匹配的限制，其阻塞抑制效果仍有提高的必要。鉴于此，本项目基于无源混频阻抗搬移特性，提出一种高Q值射频带阻滤波电路，并以此构造前馈结构射频前端放大器以实现对阻塞信号的抑制，相比传统结构可提供更好的匹配性和阻塞抑制比。结合抗阻塞下混频器以及高线性度的中频电路等的创新，将抗阻塞功能从射频前端延伸到整个接收链路以提高整个接收系统的阻塞抑制比。本项目研究成果将为抗阻塞射频接收系统及电路设计提供理论指导。

中文关键词： 全集成；抗阻塞射频接收系统；频谱搬移特性；前馈；

英文摘要： With the development of wireless communication network, due to the spectrum resources limitation, the increasing number of communication standards and terminals leads to the wire-less channels more and more crowded and the blocker in the receiver, which may make the receiver system saturate in advance. Besides, the blocker may generate the regenerated spectrum when there is strong blocking signal, which will cover the desired signal and cause the loss of desired signal. The blocker is not usually filtered by LC filter because it is too close to target channels. High-Q SAW filter can provide effective suppression to blocker，but it is lack of tuning capability and can’t be fully integrated. For the past few years, the concept of fully integrated and anti-blocking idea based on blocker cancellation has been proposed and gets attention by this field. However，above-mentioned scheme cannot provide enough blocker rejection due to the restriction of structure and circuit matching. For that reason, this project proposes a high-Q RF band stop filter circuit based on impedance move of passive mixer, also proposes a RF front-end amplifier enabled through the feed-forward structure to suppress blocker. And comparing with traditional structure, this structure can offer better matching and blocker rejection ratio. In order to

英文关键词： fully integrated；anti-blocking RF receiving system；spectrum transfer characteristics；feed-forward；