三、移相振荡器在文氏振荡器中,当振荡时,RC网络对振荡频率的相移为零,因此放大器的相移亦须为零,故文氏振荡器的放大器一般用二级串联.如果RC网络的相移为180°,则放大器就只需一级了,移相振荡器就是基于这个原理组成的.移相网络的型式很多,它可由三节、四节或更多节组成;每节的阻抗可以相等或成倍数,下面分别进行讨论. Third, the phase-shifted oscillator In the Wenger oscillator, when the oscillation, the RC network of the oscillation frequency of the phase shift is zero, so the amplifier phase shift must be zero, so the Wenger oscillator amplifier generally use two series If the phase shift of the RC network is 180 °, then the amplifier is only one stage, and the phase-shifted oscillator is based on this principle. There are many types of phase-shifting networks, which can be composed of three, four, or more sections; The impedance of each section can be equal or multiple, discussed separately below.