概述在多数由运算放大器构成的信号发生器中,正弦波不是直接产生的,而首先产生基本的方波和三角波,再利用一个无源或有源的整形网络,将三角波变成近似的正弦波,因此这样得到的正弦波失真度必然很大。而一般由LC振荡器形成的正弦波虽然可以做得很好,但由于频率较低时需要很大的电感,因此LC振荡器作为音频信号发生器并不适用。 Overview In most signal amplifiers made up of operational amplifiers, the sine wave is not generated directly, but rather the basic square wave and the triangular wave are generated first, and then the triangular wave is converted into an approximate sine wave using a passive or active shaping network , So the resulting sine wave distortion is bound to great. While a sine wave, which is typically formed by an LC oscillator, can do well, it does not work well as an audio signal generator due to the large inductance required at lower frequencies.