Chirp变换频谱分析仪的设计及其数字部分的实现

太赫兹频谱分析仪应用技术中,Chirp变换频谱分析应用了声表面波滤波器件,能够保障中频、分辨率等参数,满足深空探测领域对稳定性和功耗的严格要求。但目前国内的Chirp变换频谱分析仪只能处理400 MHz带宽的输入信号,不能完全满足应用需要。为了提高带宽,本文围绕1 GHz带宽声表面波滤波器件,利用直接数字频率合成技术产生与其匹配的2 GHz带宽的线性调频信号,设计了带宽为1 GHz,中心频率为3. 2 GHz的频谱分析仪,并对数字部分进行了实现和结果分析验证。

Design of Chirp Transform Spectrum Analyzer and Realization of Its Digital Part

In the application technology of terahertz spectrum analyzer, Chirp transform spectrum analysis uses surface acoustic wave filter, which can guarantee the parameters of intermediate frequency and resolution, and meet the strict requirements of stability and power consumption in deep space exploration. However, the Chirp transform spectrum analyzer in China can only process 400 MHz bandwidth input signal, which can not fully meet the application needs. In order to improve the bandwidth, a frequency analyzer with 1 GHz bandwidth and 3.2 GHz center frequency is designed in this paper. The digital part is implemented and the results are analyzed and validated.