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(5)振荡电路:在各种振荡电路,如RC移相式振荡电路、RC串、并联式振荡电路(又称文氏桥式振荡电路)、双T选频式振荡电路、LC振荡电路和晶体振荡电路等中,都离不开电容器这一关键元件。在RC移相式振荡器中电容的主要作用是移相(利用电容器两端电压不能突变,电压滞后电流90°原理),而在LC振荡器中,电容C的作用是选频和正反馈。它们通过移相、选频、反馈网络来满足振荡的振幅和相位两个条件(如图24a、b、
(5) Oscillation circuit: In a variety of oscillation circuits, such as RC phase-shift oscillation circuit, RC series, parallel oscillation circuit (also known as Venturi bridge oscillation circuit), dual T frequency oscillation circuit, LC oscillation circuit and Crystal oscillator circuit, etc., are inseparable from the capacitor of this key component. In the RC phase-shift oscillator capacitor is the main role of phase-shift (using the voltage across the capacitor can not be abrupt change, the voltage hysteresis current 90 ° principle), and in the LC oscillator, the role of capacitor C is the frequency selection and positive feedback. They satisfy the two conditions of amplitude and phase of oscillation by phase shift, frequency selection and feedback network (as shown in Fig.24a, b,