单片宽带频谱分析芯片设计

Design of Monolithic Chip for Broadband Spectrum Analysis

文章介绍了单片宽带实时频谱分析芯片的设计原理和方法,并在FPGA上进行了原型验证。设计中采用了基于多相滤波器组的下变频方案,并对下变频后每一路数据进行重叠加窗处理。为了减小芯片面积,对后端的FFT分析模块进行了优化设计,提出了将两条蝶形运算级合并为一条流水线的新型FFT设计构架。该设计可以不间断地处理数据,从而实现信号的无缝捕获。

This paper presents a design principle and method of the real-time wideband frequency analysis chip based on the sole chip. The circuit architecture on the FPGA chip for the prototype verification. In the design, the poly-phase filter bank is adopted as the Digital Down Converter （ DDC ） ,and each path of data channels after DDC is overlapped and windowed. In order to reduce the chip area, the back-end FFT analysis module is optimized and a new FFT architecture which combines two butterfly computing stages into one pipeline is also proposed. The design can process the data continuously and achieve the seamless capture of signals.