|Autors: Pandiev, I. M.|
Title: High-Order Digitally Programmable CFOA Universal Filter Structures Based on State Variable Approach
Keywords: Active filters; analog circuit design; state variable approach; current-feedback operational amplifiers (CFOAs); digital potentiometers
Abstract: In this paper third-order and fourth-order digitally programmable universal filter structures are synthesized. The proposed electronic circuits are created based on the well-known state variable approach and techniques for designing digitally programmable active filters and oscillators. The first filter can realize third-order low-pass and high-pass electronically tunable transfer functions, while the second one can realize basic biquadratic tunable functions namely: low-pass, high-pass bandpass and band-reject. The cutoff frequencies of the proposed filters are electronically tuned via external digital words, applied to the address inputs of CMOS digital potentiometers. The digital potentiometers are connected as variable resistors in CFOA programmable integrator structures. The validity of the filters is demonstrated by simulations and experimental testing of sample electronic circuits.
1. Aleksandrova, M., Tsanev, T., Dobrikov, G., Sophocleous, M., Georgiou, J., Denishev, K., "Sputtering of Ga-doped ZnO nanocoatings on silicon for piezoelectric transducers," IOP Conference Series: Materials Science and EngineeringVolume 618, Issue 1, 29 October 2019, Article number 0120148th International Scientific Conference on Engineering, Technologies and Systems, TechSys 2019; Plovdiv; Bulgaria; 16 May 2019 through 18 May 2019; Code 155190 - 2019 - в издания, индексирани в Scopus или Web of Science
Вид: публикация в международен форум, публикация в реферирано издание, индексирана в Scopus