Design And Research Of A Spectrum Analyzer On Nios Ⅱ

Spectrum analysis is an important tool of electronic design. High resolution, wideband real-time digital design and implementation of the spectrum analyzer has been the research focus in the field of real-time spectrum analysis,which has important significance in the engineering practice and theoretical research. Now universal spectrum analyzer is based on PC, whose circuit is complex and power consumption is large, the main part of it is used software, and the price is expensive.The basic structure of Niosâ…¡is hardware realiztion, The instruction is the concurrent execution, Speed, strong performance. Large system upgrade.This paper carries out research and design of embedded spectrum analyzer based on Niosâ…¡soft nuclear.In the more thorough research spectrum analyzer's technology situation, general design principle and function, I determine the topic design and technical index, realize hardware circuit design and SOPC system design based on the Niosâ…¡soft nuclear. Peripheral hardware circuit design includes attenuation circuit design, broadband amplification circuit design, the design of aliasing filter circuit and AD transform circuit design. The SOPC system focal point is design of custom components based on the Avalon bus, including the LCD controller,FIR, AD transform controller, PS/2 keyboard controller, FIFO.they are all hardware design. Based on the existing FFT algorithm and general design of hardware structure, make full use of the FPGA and unique characteristic of Niosâ…¡, adopting the direct method for power spectral density and designing FFT nuclear of the hardware cascade structure, building a reasonable SOPC system, realizing the software design based on the Niosâ…¡after. The program includes a window algorithm design, liquid crystal display design program, serial interrupt program design, keyboard program design etc.The designed nuclear FFT is underwayed by the software and hardware simulation, the simulation results show that the designed algorithm is correct, the designed FFT nuclear can be used.