Generalized Structure of Active RC Filters with Independent Tuning of Pole Frequency, Pole Q-Factor and Transfer Ratio

The generalized structure of the second-order RC filters (LPF, HPF, BPF) with independent setting of the basic parameters - pole frequency, pole Q-factor and transfer ratio is considered. From these positions, the requirements for three special transfer functions (TF) of the multipole of the frequency-setting RC circuit, which contains two resistors and two capacitors, are formulated. The type of the required filter (LPF, HPF, BPF) is implemented by selecting the coefficients of the numerator of the first TF. The coefficients of the second TF are chosen so that that they only affect the pole frequency. In this case, the choice of the parameters of the third TF provides the required pole attenuation. The stages of synthesis of the ARCFs of this class, the existence of which is confirmed by 14 patents of the Russian Federation, are considered.