设计的虚拟频谱分析仪由周期性信号发生器、信号幅频/相频特性、频谱分析结果三个子模块组成。信号发生器子模块生成两路模拟输入信号，一路是可调频率、相位和振幅的正弦信号、方波、三角波、锯齿波、白噪声，另一路是指可调频率、相位和振幅的正弦波、方波、三角波、锯齿波、白噪声，最后利用信号合成器把两路信号混合起来作为生成的2路模拟信号(The designed virtual spectrum analyzer consists of three sub modules, which are periodic signal generator, signal amplitude frequency / phase frequency characteristic and spectrum analysis result. The signal generator module generates two analog input signals, one is the sine signal of adjustable frequency, phase and amplitude, Fang Bo, triangle wave, sawtooth wave and white noise. The other means the sine wave of adjustable frequency, phase and amplitude, Fang Bo, triangle wave, sawtooth wave and white noise. Finally, the signal synthesizer is used to make two of the signal. The road signal is mixed as the 2 way analog signal generated.)