随着线性集成电路性能的提高、价格的降低,有源滤波器应用日益广泛。特别是宽带运放的涌现,使有源滤波器逐渐进入载波通讯领域,其优良的性能价格比大有取代无源LC滤波器之势。本文介绍的就是我们在研制油田“找水仪”过程中设计的一种性能优良的有源带通滤波器。其主要特点是:Q值高,且易于控制;通带内不平度好,很容易做到0.1db以上;阻带衰减大、矩形系数好,倍频程衰减很容易做到60db以 With the performance of linear integrated circuits, lower prices, active filter applications are increasingly widespread. In particular, the emergence of broadband op amps, active filters gradually into the field of carrier communications, its excellent cost performance greatly replaced passive LC filter potential. This article describes an excellent performance active band-pass filter that we designed during the development of the field-finding water meter. Its main features are: Q value is high, and easy to control; pass band unevenness is good, it is easy to do more than 0.1db; stop band attenuation, rectangular coefficient is good, octave attenuation is easy to do 60db