一种适用于0.4～2.7 GHz的宽带可变增益接收混频器

发布时间：2018-05-21 06:09

本文选题：接收混频器 + 宽带接收机　；参考：《浙江大学》2017年硕士论文

【摘要】：接收混频器作为接收通道中的核心模块,在实现宽带多模射频芯片的设计中具有重要作用。高性能的宽带混频器设计不仅有利于改善接收通道的整体性能,还可以极大提高支持多模、多频宽带应用的无线系统的灵活性。为了使现代宽带接收机的射频前端能够提供更高的线性度以及更宽的动态范围,本文研究设计了一种适用于0.4～2.7 GHz频率范围的宽带可变增益接收混频器。论文通过对比各种基本类型的混频器,设计和优化了适合宽带应用的接收混频器架构。在电流型无源混频器性能分析的基础上,通过增加多档增益切换功能以提高混频器的输入动态范围,并在宽带应用中增加谐波抑制功能以减小谐波信号的干扰。此外,文中采用两级谐波抑制结构改善混频器的谐波抑制效果,并提出新的电路设计方案以实现八相位本振信号。最终完成的宽带可变增益接收混频器具有谐波抑制工作模式和普通工作模式,并经过后续的优化设计有效缩减该双模混频器的芯片面积。本文选用TSMC 65nm RF CMOS工艺进行宽带可变增益接收混频器的电路设计和版图实现,并对完成的设计进行仿真分析。仿真结果表明,本文设计的宽带可变增益接收混频器能够实现1～30 dB增益范围可调,增益步进为1 dB,最高增益工作条件下,噪声系数优于6.5 dB且输入IIP3优于2 dBm,宽带应用中三次和五次谐波的抑制水平分别优于55 dB和59 dB。
[Abstract]:As the core module of the receiving channel, the receiver mixer plays an important role in the design of broadband multimode RF chip. The design of high performance broadband mixer not only improves the overall performance of the receiving channel, but also greatly improves the flexibility of wireless systems supporting multi-mode and multi-frequency broadband applications. In order to make the RF front-end of modern wideband receiver provide higher linearity and wider dynamic range, a wideband variable gain receiver mixer suitable for 0.4 GHz frequency range is designed in this paper. By comparing various basic types of mixers, this paper designs and optimizes the architecture of reception mixers suitable for broadband applications. Based on the analysis of the performance of the current-mode passive mixer, the input dynamic range of the mixer is improved by adding the multi-stage gain switching function, and the harmonic suppression function is added in the wideband application to reduce the interference of the harmonic signal. In addition, the two-order harmonic suppression structure is used to improve the harmonic suppression effect of the mixer, and a new circuit design scheme is proposed to realize the 8-phase local oscillator signal. The final wideband variable gain receiving mixer has harmonic suppression mode and common mode of operation, and the chip area of the dual-mode mixer is effectively reduced by subsequent optimization design. In this paper, TSMC 65nm RF CMOS process is used for the circuit design and layout realization of wideband variable gain receiver mixer, and the simulation analysis of the completed design is carried out. The simulation results show that the wideband variable gain receiver mixer designed in this paper can achieve the gain range of 1Hz 30 dB, the gain step is 1 dB, and the maximum gain working condition is obtained. The noise coefficient is better than 6.5 dB and the input IIP3 is better than 2 dBm.The third and fifth harmonic suppression levels in broadband applications are better than 55 dB and 59 dB, respectively.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN773

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