All-Pass Frequency Selective Structures: Application for Analog Domain

Abstract

Two new simple and effective voltage mode frequency selective structures that pass all signals are proposed and explored in this paper. The proposed structures use a single active element and three passive components in each. Dual-X second generation current conveyor (DXCCII) is employed as an active element along with two resistors and a capacitor as passive elements. The capacitor is grounded which goes well with the IC fabrication requirements. Both the structures offer low active and passive sensitivities. The presented structures also exhibit the feature of high input impedance. A comprehensive study of device non-idealities and parasitic is also included to highlight the non-ideal performance of the presented ideas. In addition, to prevent the use of passive resistors, resistor less realizations of proposed structures are also explored by replacing the passive resistors with MOS-based active resistors. A quadrature oscillator is also presented as one of the possible applications of the proposed frequency selective structures. Simulations results are in match with the theoretically analyzed performance.