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通常集成电路振荡器都需要外按电容,这给许多含有振荡器电路的集成电路的单片化带来了困难。因而研究不用外接电容的振荡器引起了重视,这就是本文所要介绍的有源R振荡电路。有源R振荡器是基于集成运算放大器具有固有的截止频率这一特性形成的,截止频率的大小由运算放大器内部的寄生电容和内部补偿电容(如μA741)所决定。运算放大器的频率响应通常可视为一阶响应或二阶响应,由此可建立单极点模型或双极点模型。一阶响应的单极点模型为
In general, integrated circuit oscillators require external capacitors, which makes it difficult to singulate many integrated circuits that contain oscillator circuits. Therefore, the study of capacitors without external oscillator attracted the attention, this is the article to introduce the active R oscillator circuit. The active R oscillator is based on the characteristic that the integrated op amp has an inherent cut-off frequency, which is determined by the internal parasitic capacitance of the op amp and an internal compensation capacitor (eg, μA741). The frequency response of an op amp can usually be considered as a first-order response or a second-order response, whereby a single-pole model or a two-pole model can be established. The first-order response of the single-pole model is