Sallen-Key Band-pass Filters with Independent Tuning of General Parameters

Abstract

Two modifications of band-pass filters (BPF) of the Sallen-Key family of the second order are considered, in which independent tuning of general parameters - the pole frequency, pole attenuation and the transfer scale factor is implemented. The transfer functions and main parameters of the classical well-known Sallen-Key scheme BPF and its two new modifications are compared. The results of computer simulation in CAD Micro-Cap 12 of amplitude-frequency characteristics of two BPF are presented. Pole frequency and pole attenuation in the developed filters are adjusted by resistors R5, R7. The second modification of the BPF contains two outputs, which provides additional opportunities for its application.