由于能以开关电容形式来等效电阻,而电容又易于集成化,因而就出现了商品化的单片滤波器件来取代RC有源滤波器。本文即介绍此新器件的原理,并给出了组成低通滤波、正弦/余弦发生器及调制、解调器的应用例。 Due to the equivalent resistance in the form of a switched capacitor, which is easily integrated, a commercial monolithic filter has emerged as an alternative to the RC active filter. This article describes the principle of the new device, and gives the composition of low-pass filter, sine / cosine generator and modulation, demodulator applications.