CAJ | 학술논문

提出了一种基于FPGA的频谱分析仪的设计方案,基于超外差和快速傅里叶变换原理,实现了能显示输入信号频谱图的分析仪.其中本地振荡信号由DDS集成芯片产生,与输入信号通过模拟乘法器进行混频,经过开关电容滤波器滤出下混频信号后由A/D采样器进行数字量化.系统数据处理核心对量化后的数字信号进行快速傅里叶变换,得到相应的频域信息,最后由示波器显示频谱.系统将超外差方式与数字信号处理方式相结合,具有测量速度快、实时性强、频率范围宽、频率分辨率高、精确度高等优点.
제출료일충기우FPGA적빈보분석의적설계방안,기우초외차화쾌속부리협변환원리,실현료능현시수입신호빈보도적분석의.기중본지진탕신호유DDS집성심편산생,여수입신호통과모의승법기진행혼빈,경과개관전용려파기려출하혼빈신호후유A/D채양기진행수자양화.계통수거처리핵심대양화후적수자신호진행쾌속부리협변환,득도상응적빈역신식,최후유시파기현시빈보.계통장초외차방식여수자신호처리방식상결합,구유측량속도쾌、실시성강、빈솔범위관、빈솔분변솔고、정학도고등우점.
A design scheme of spectral analyzer based on FPGA is introduced. The spectrum analyzer which can display spectrogram of the input signal was realized based on the super heterodyne and fast Fourier transform principle. The local oscilla?tion signal is generated by the DDS chip,mixing with the input signal through the analog multiplier. A switch capacitor filter is used to filter out the down?mixed signal,which is sampled by analog digital converter. The core of the system data processor uses the fast Fourier transform to get the corresponding frequency domain information,and display the spectrum on the oscillo?scope. The system uses super heterodyne combined with digital signal processing,which can achieve fast measurement speed, strong real?time performance,wide frequency range,high frequency resolution and high accuracy.