基于FPGA技术的数字中频系统的设计∗

摘要

After the study of basic theory of the digital IF technology,we research on the implementation of the digit-al IF technology based on FPGA,including the mode and structure of NCO mixer,multi-rate signal processing( deci-mation and interpolation) module,FIR filter module based on FPGA. At the end,this paper simulates the modules in the digital IF system by MATLAB and DSP Builder and realizes programming of the system by QuartusⅡ. The Cor-rectness and feasibility of the design scheme are verified through software simulation.%在数字中频的理论基础上，研究了数字中频的FPGA实现技术。包括NCO混频器、多速率信号处理(抽取和内插)模块、FIR滤波器模块在FPGA上的实现方式和结构。然后对数字中频系统中的各个模块利用MATLAB和DSP Builder进行了仿真，并使用QuartusⅡ编程实现。通过在软件上仿真数字中频系统，验证了本设计方案的正确性和可行性。