全奈奎斯特频带的正交数字上变频器设计

发布时间：2018-05-19 08:09

本文选题：数字上变频器 + 半带滤波器　；参考：《华中科技大学学报(自然科学版)》2017年08期

【摘要】：针对数字上变频器存在的功耗大、灵活性差等问题,提出一种低功耗的正交数字上变频器设计方案.采用先混频再进行插值调制的上变频结构,使信号频谱能灵活地搬移到奈奎斯特频带内的任意位置.改进后数字上变频器中的数字控制振荡器和插值滤波器都工作在较低频率上,达到了降低功耗的目的,而且插值滤波器采用了一种新颖的两路结构半带滤波器,将补零、滤波和调制功能融合在一起,通过简单地改变输入信号路径即可实现调制可编程.最后在Xilinx KC705开发套件上进行了仿真实现.仿真结果表明:该设计方案可使信号在全奈奎斯特频带范围内进行上变频,具有功耗低、应用灵活等特征,最高输出频率可达392 MHz,功耗降低33.3%,更加适合应用于高速低功耗的通信系统.
[Abstract]:Aiming at the problems of high power consumption and poor flexibility of digital upconverter, a low power consumption design scheme of orthogonal digital upconverter is proposed. The up-conversion structure of mixing first and then interpolating makes the signal spectrum move flexibly to any position in Nyquist frequency band. Both the digital control oscillator and the interpolation filter in the improved digital upconverter work at lower frequencies to reduce the power consumption. Moreover, the interpolation filter uses a novel two-channel half-band filter, which will complement the zero. The filtering and modulation functions are fused together, and the modulation programmable can be realized by simply changing the input signal path. Finally, the simulation is implemented on the Xilinx KC705 development suite. The simulation results show that the proposed scheme can up-convert the signal in the whole Nyquist frequency band, and has the characteristics of low power consumption and flexible application. The highest output frequency can reach 392 MHz and the power consumption is reduced by 33.33.It is more suitable for high speed and low power consumption communication systems.
【作者单位】：中国地质大学机械与电子信息学院;
【基金】：国家自然科学基金资助项目(41304078)
【分类号】：TN773

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