CMOS Realizable and Highly Cascadable Structures of First-Order All-Pass Filters

Jitender Jitender; Jitendra  MOHAN; Bhartendu  CHATURVEDI

doi:10.48048/wjst.2021.21451

Authors

Jitender Department of Electronics and Communication Engineering, Jaypee Institute of Information Technology, Noida, Uttar Pradesh 201304, India
Jitendra MOHAN https://wjst.wu.ac.th/index.php/wjst/management/importexport/plugin/QuickSubmitPlugin/saveSubmit
Bhartendu CHATURVEDI Department of Electronics and Communication Engineering, Jaypee Institute of Information Technology, Noida, Uttar Pradesh 201304, India

DOI:

https://doi.org/10.48048/wjst.2021.21451

Keywords:

All-pass filter, Cascadable, First-order, FDCCII, Voltage-mode

Abstract

Two novel resistorless structures of a first-order voltage-mode all-pass filter are presented in the paper. Both the structures employ a fully differential second-generation current conveyor (FDCCII) as the primary active element, in addition to an active resistor. A grounded capacitor is the only passive component used in both the structures. In both the structures, CMOS realization of FDCCII is utilized; hence, these structures are CMOS compatible. Some of the other highly demanded features possessed by the presented all-pass structures are: a simple circuit topology, electronic tunability, high input impedance, constraint-free operation in terms of passive component matching, and low sensitivity figures. The theoretical performances under ideal and non-ideal scenarios are presented in detail. Furthermore, the proposed idea is extended to an N^th-order voltage-mode all-pass filter and a quadrature oscillator to explore some of the possible applications. PSPICE simulation results verify the theoretical claims of the presented all-pass filters.

HIGHLIGHTS

Two novel resistorless structures of first-order all-pass filters based on fully differential second-generation current conveyor are presented
Performance of the proposed structures are thoroughly described in ideal and non-ideal scenarios
Theoretically described details of the proposed structures are verified by carrying simulations on PSPICE using 180 nm CMOS technology
An N^th-order all-pass filter and a quadrature oscillator are also presented as applications

GRAPHICAL ABSTRACT

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