振荡器噪声 振荡器噪声可分为幅度噪声和相位噪声,如图1反馈振荡器所示。这里虽然是采用反馈振荡器来说明问题,实际上一个负阻振荡器也能说明同样的问题。在此处所示的反馈振荡器中,由求和节将输入扰动加至增益级G的输入端。增益级的输出V_(out),经选频方框H反馈至求和节的输入端。总的传递函数为: G_(total)=V_(out)/V_(in)=G/(1—GH) (1) 当(1—GH)恒等于零时,则呈现稳定的振 Oscillator Noise Oscillator noise can be divided into amplitude noise and phase noise, as shown in Figure 1, the feedback oscillator. Although here is the use of feedback oscillator to illustrate the problem, in fact, a negative resistance oscillator can illustrate the same problem. In the feedback oscillator shown here, the input disturbance is added to the input of gain stage G by the summing junction. The output of the gain stage, V_ (out), is fed back to the input of the summation block via the selection block H. The total transfer function is: G_ total = V_out / V_in = G / 1-GH (1) When (1-GH) is equal to zero, a stable vibration