Controllable RLC High-Frequency Filter with Resistive Tuning of Key Parameters

A new RLC high-pass filter circuit is considered, in which, due to the introduction of additional buffer amplifiers (voltage followers) and resistive voltage dividers, independent tuning of the pole Q-factor and the pole frequency by various resistance is realized at constant capacitance values of the frequency-setting capacitor and frequency-setting inductance. The article discusses the conclusion of modeling RLC high-pass filter in the Micro-Cap, which confirm its claimed properties. The basic mathematical equations for the transfer function of the RLC high-pass filter and the parameters of its frequency response are obtained. The equations obtained above make it possible to develop an algorithm for independent adjustment of the parameters of the proposed RLC filter. The RLC high-pass filter circuitry proposed by the authors is recommended for adaptive filtering of signals in radio engineering and measuring systems. Due to the appropriate parameters choice of passive and active circuit elements, it is possible to ensure the operation of the considered RLC high-pass filter both at low and at high frequencies.