多模多标准接收机中可重构混频器的设计

发布时间：2018-04-19 20:00

本文选题：可重构 + 无源混频器　；参考：《东南大学》2015年硕士论文

【摘要】：随着无线通信技术的迅速发展,针对不同应用需求的无线通信标准层出不穷。其应用已经拓展到移动蜂窝通信领域的各种标准、全球卫星导航系统、无线局域网及无线传感网等。因而研究设计能够兼容多种通信标准的无线射频收发机十分必要。混频器作为接收机中的关键模块之一,在多模多标准的接收机中,其可重构性能的研究与设计变得十分有意义。本文设计了一个应用于直接下变频多模多标准接收机的可重构宽带无源混频器。本文采用由跨导级、开关级、跨阻放大器级组成的电流型混频器。不同于传统的电流型混频器,本设计中的跨导级设计成可变跨导级；而跨阻级采用Tow-Thomas结构组成的二阶低通跨阻放大器,组成一个带宽可调的电流型滤波器。混频器电路通过4位控制字实现了灵活的增益变化和可变的中频带宽,同时线性度、噪声系数等其他指标也会相应适配,以适应不同通信标准的要求。本设计采用TSMC 0.18μm RF CMOS工艺实现。电路后仿真结果均满足设计指标要求。芯片尺寸约为760μm×600μm,并已成功流片。在片测试结果表明,混频器可覆盖射频范围700MHz到2.6GHz,并提供8/14/20/26 dB四种电压转换增益和5/7.5/10MHz三种-3dB的中频带宽。在最高增益下,混频器的双边带噪声系数为9.1dB；而在最低增益下具有很好的线性度,ⅡP3为8.5dBmo在1.8V电源电压下,在两个高增益模式下消耗4.9mA电流,在两个低增益模式下消耗7.8mA电流。
[Abstract]:With the rapid development of wireless communication technology, wireless communication standards for different applications have emerged one after another. Its applications have been extended to various standards in the field of mobile cellular communications, such as global satellite navigation systems, wireless local area networks and wireless sensor networks. Therefore, it is necessary to study and design radio frequency transceiver compatible with many communication standards. As one of the key modules in the receiver, the study and design of the reconfigurable performance of the mixers is of great significance in the multi-mode and multi-standard receivers. In this paper, a reconfigurable wideband passive mixer is designed for direct downconversion multimode multimode receiver. In this paper, the current-mode mixer is composed of transconductance stage, switch stage and transresistance amplifier stage. Different from the traditional current-mode mixer, the transconductance stage in this design is designed as a variable transconductance stage, while the transresistance stage is composed of a second-order low-pass transresistance amplifier with Tow-Thomas structure, which forms a current-mode filter with adjustable bandwidth. The mixer circuit achieves flexible gain variation and variable intermediate frequency bandwidth by 4-bit control word. At the same time, linearity, noise coefficient and other indexes are adapted to meet the requirements of different communication standards. The design is realized by TSMC 0.18 渭 m RF CMOS process. The simulation results of the circuit all meet the requirements of the design index. The chip size is about 760 渭 m 脳 600 渭 m. The in-chip test results show that the mixer can cover the RF range from 700MHz to 2.6 GHz and provide four voltage conversion gains of 8 / 14 / 20 / 26 dB and if bandwidth of 5/7.5/10MHz three kinds of -3dB. Under the maximum gain, the bilateral band noise coefficient of the mixer is 9.1 dB, and the linearity is good at the lowest gain. The 4.9mA current is consumed by 8.5dBmo at 1.8 V supply voltage and two high gain modes. 7.8mA current is consumed in two low gain modes.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN773

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