|Autors: Pandiev, I. M.|
Title: Digitally Programmable All-Pass CFA Filter Based on Follow-the-Leader-Feedback Topology
Keywords: Active filters, All-pass filters, Analog circuit design, CFOA, Potentiometers, Digital-controlled oscillators
Abstract: This paper describes the structure and opera¬tional principle of a digitally programmable second-order all-pass filter using monolithic current-feedback amplifiers (CFAs). The proposed filter was synthesized by using general follow-the-leader-feedback (FLF) topology and includes a cascade structure of two digitally controlled RC integra¬tors and two summing amplifiers. The filter employs independent digital control of the pole frequency within 0.1 % resolution by controlling the time constants of the two integrators through two 1024 - position monolithic digital poten¬tiome¬ters, used as variable resistors. By connecting the output port to the input of the created filter, an electronic circuit of quadrature oscillator is obtained. The efficiency of the proposed oscillator is demonstrated by comparing the simulation results for the basic electrical parameters with experimental results of sample electronic circuits, working up to 130 kHz with THD below 1 %.
1. "Band-Pass ARC-Filter with pole frequency, pole decay and transfer ratio independent adjustment," Denisenko, D.Y., Zhebrun, E.A., Prokopenko, N.N., Ivanov, Y.I. 2019 16th Conference on Electrical Machines, Drives and Power Systems, ELMA 2019 - Proceedings 8771568 - 2019 - в издания, индексирани в Scopus или Web of Science
Вид: публикация в международен форум, публикация в реферирано издание, индексирана в Scopus и Web of Science