Supplementary CCII based second-order universal filter and quadrature oscillators

Abstract

A voltage-mode universal biquadratic filter and two quadrature oscillators (QOs) based on CCIIs namely second-generation current conveyors are proposed. The proposed filter with one output and three inputs consists of two CCIIs, three resistors and two capacitors. It can provide all the standard second-order universal filter transfer functions with appropriate choice of input voltages. It also has the orthogonal control of the quality factor and angular resonance frequency. However, a resistive matching condition is required for the all-pass responses. The first proposed QO includes two CCIIs, three resistors and two grounded capacitors while the second one is composed of three plus-type CCIIs, three resistors and two grounded capacitors. By a single grounded resistor, oscillation frequencies of both of the proposed QOs can be controlled orthogonally. Furthermore, in order to confirm the theory, a lot of simulation and experimental results are given. © 2020 Elsevier GmbH