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引言信号发生器的频率稳定度可用Y(t)的单边带频谱密度表征。Y(t)是信号发生器标称频率信号输出电压V(t)的相对频率偏移。因此假定 V(t)=[V_0+ε(t)]Sin[2πv_0+φ(t)] (1) Y(t)=φ(t)/2πv_0 (2) S_y(f)=(1/2πv_0)~2S_φ(f) (3) S_y(f)=(1/v_0)~2f~2S_φ(f) (4)虽然S_y(f)是频率源的频率稳定度的基本定义,也是频率和时间技术委员会频率稳定度IEEE分会所推荐的定义,而采用射
Introduction The frequency stability of signal generators can be characterized by the single-sideband spectral density of Y (t). Y (t) is the relative frequency offset of the signal generator nominal frequency signal output voltage V (t). Therefore, it is assumed that V (t) = [V_0 + ε (t)] Sin [2πv_0 + φ (t)] Yt = φ t / 2πv_0 S_y f = 1 / 2πv_0 ) ~ 2S_φ (3) S_y (f) = (1 / v_0) ~ 2f ~ 2S_φ (4) Although S_y (f) is a basic definition of the frequency stability of a frequency source, it is also the frequency and time technique Committee frequency stability IEEE branch of the recommended definition, and the use of radio