众所周知,Rc有源滤波器有许多突出的优点,如不需电感元件、信号源及负载对其幅频特性的影响甚小、它对信号还有一定增益等,因此,它正日益广泛地用于形形色色的电子设备中,无论是专业人员,还是业余电子爱好者,都常常不可避免地要与它打交道。然而,令人遗憾的是,尽管有关这方面的书籍及文章多如牛毛,但是要么理论性太强,使人望而生畏,要么又局限性太强,准确度不高,甚至错误百出者亦不乏其例,加之众说纷纭,使人莫衷一是。其实,对广大设计人员而言,早已熟悉有源滤波器的各种原理线路,也不想再过于深究,重要的是要找到一种简单明了而又准确可靠的 As we all know, Rc active filter has many outstanding advantages, such as the absence of inductive components, the signal source and load on the amplitude-frequency characteristics of little influence, it has a certain signal gain and so on, it is increasingly widely used Of all kinds of electronic devices, professionals and amateur hobbyists often have to deal with it inevitably. However, regrettably, despite the abundance of books and articles in this field, they are either too theoretical, daunting or too restrictive in their accuracy. Even the most erroneous ones are numerous examples. Coupled with public opinions, it is incomprehensible. In fact, for the majority of designers, already familiar with the various principles of active filter circuit, do not want to go too far, it is important to find a simple and clear and accurate and reliable