https://en.wikipedia.org/wiki/Electronic_oscillator
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.[1]
Oscillators are often characterized by the frequency of their output signal:
- A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below ≈20 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator.
- An audio oscillator produces frequencies in the audio range, about 16 Hz to 20 kHz.[2]
- An RF oscillator produces signals in the radio frequency (RF) range of about 100 kHz to 100 GHz.[2]
Oscillators designed to produce a high-power AC output from a DC supply are usually called inverters.
https://zh.wikipedia.org/wiki/电子振荡器
电子振荡器（英语：electronic oscillator）是用来产生具有周期性的模拟信号（通常是正弦波或方波）的电子电路。[1]
振荡器通常用他们输出信号的频率描述：
- 低频振荡器（low-frequency oscillator, LFO）是指产生频率在20 kHz以下的（有的定义在0.1到10赫兹之间）交流信号振荡器。它通常用在音讯合成器中，用来区别其他的音讯振荡器。
- 音频振荡器产生频率在音频范围内，约16 Hz到20 kHz。[2]
- 射频振荡器产生的信号在射频（RF）范围内，约100 kHz至100 GHz。[2]
用来由直流电源产生高功率交流输出的振荡器通常称为逆变器。
振荡器主要可以分成以下两种：谐波振荡器（harmonic oscillator）与弛张振荡器（relaxation oscillator）。
A popular op-amp relaxation oscillator.
一种普遍使用的运算放大器弛张振荡器。