射频前端高线性度混频器的研究与设计

发布时间：2018-01-07 16:15

  本文关键词：射频前端高线性度混频器的研究与设计　出处：《广西师范大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 下混频器 第三阶跨导系数 WLAN 高线性度 GPS

【摘要】：随着无线通信网络的高速发展,对无线通信设备的性能提出了更高的要求,高性能的无线接收机射频前端迫切需要。在射频接收机前端中,混频器是一个关键性模块,其线性度决定了整个接收机的动态范围,因此研究高线性度混频器已成为人们研究射频接收机系统的重点。一般而言,随着混频器动态范围的提高,混频器的直流功耗也随之增加。所以如何在低功耗的基础上提高混频器的线性度,同时兼顾其他性能,是目前混频器设计的难点。本论文首先阐述了 GPS卫星导航和WLAN 802.11b/g标准的非蜂窝无线通信在社会生活中的重要使用,介绍了混频器目前国内外的研究现状。然后详细分析了吉尔伯特混频器的转换增益、噪声、线性度以及提高这些性能的具体优化技术。最后在此基础上,采用TSMC 0.18um CMOS RF工艺完成了以下两款下混频器的设计与仿真:(1)研究了一种应用于GPS卫星导航的射频前端下混频器。该电路主要是通过采用派生项叠加技术、改进型动态电流注入技术、RC网络负载技术来提高混频器的线性度和降低噪声。本设计工作于GPS L1频段1.575GHz,电路的前仿真结果为:在1.8V供电电压下,转换增益为13,1dB,输入三阶交调点(ⅡP3)为4.4dBm,噪声系数为7.45dB,电路功耗为7.2mW。(2)研究了一种适用于2.4G WLAN CMOS高线性度下混频器。该设计创新了一种第三阶跨导系数修正电流镜对电路,有效的改善混频器的线性度,而且增加了设计的自由度;采用电流注入技术来提高开关级的噪声性能:源极电感反馈进行射频端口的输入匹配,同时还提高混频器的线性度。该电路工作在1.8V电压下,前仿真结果为:电压转换增益14.6dB,输入三阶交调点(ⅡP3)达到12.69dBm,噪声系数为7.13dB,电路的功耗小于8 mW。
[Abstract]:With the rapid development of wireless communication network, higher requirements for the performance of wireless communication equipment are put forward. The high performance radio receiver RF front-end is urgently needed in the RF receiver front end. Mixer is a key module, its linearity determines the dynamic range of the whole receiver, so the study of high linearity mixer has become the focus of RF receiver system. With the increase of dynamic range of mixer, the DC power consumption of mixer also increases. So how to improve the linearity of mixer on the basis of low power consumption while taking into account other performance. This paper first describes the important use of GPS satellite navigation and WLAN 802.11b / g standard non-cellular wireless communication in social life. This paper introduces the current research situation of the mixer at home and abroad, and then analyzes the conversion gain, noise, linearity and the specific optimization techniques to improve the performance of the Gilbert mixer in detail. Using TSMC 0.18um CMOS RF process to complete the design and simulation of the following two models of mixer: 1). A RF front-end mixer used in GPS satellite navigation is studied. The improved dynamic current injection technique and RC network load technology are used to improve the linearity and reduce the noise of the mixer. This design works at 1.575GHz in the GPS L1 band. The simulation results are as follows: at 1.8V supply voltage, the conversion gain is 131dB, the input third-order alternating point (鈪，

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