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反馈放大器的性质指明,要使放大器产生自激振荡必须实现正反馈,并具有一定的反馈量.因此,相位条件φ_(ku)+φ_(kf)=2nπ(n=0,1,2……)和振幅条件K_uk_(fu)>1是产生振荡不可缺一的条件.在分析计算各种振荡电路时,应该从这两个基本条件出发. LC振荡器和晶体振荡器的电路形式很多,但是基本类型总不外乎两种,即互感耦合振荡器和三点式振荡器.为了正确分析计算振荡电路,通常采用高频
The nature of the feedback amplifier indicates that for the amplifier to generate self-oscillation it is necessary to achieve positive feedback and have a certain amount of feedback. Therefore, the phase condition φ ku + φ kf = 2nπ (n = 0, 1, 2 ) And the amplitude condition K_uk_ (fu)> 1 are the indispensable conditions for generating oscillation. When analyzing and calculating various oscillation circuits, the two basic conditions should be considered. There are many types of circuits for the LC oscillator and the crystal oscillator. However, The basic type is no more than two, namely, mutual inductance coupled oscillator and three-point oscillator. In order to correctly analyze and calculate the oscillation circuit, usually using high-frequency