Electronically Tunable Voltage-Mode Biquad Filter/Oscillator Based On CCCCTAs

TL;DR

This paper presents a versatile, resistorless, electronically tunable voltage-mode biquad filter and oscillator using CCCCTAs, suitable for IC implementation, with features like orthogonal control of frequency and quality factor verified by simulations.

Contribution

It introduces a novel resistorless circuit employing CCCCTAs that functions as both a tunable filter and oscillator with independent parameter control.

Findings

Successfully implements all standard filter functions in voltage mode.

Provides electronic and orthogonal control of pole frequency and Q factor.

Validated through PSPICE simulations demonstrating functionality.

Abstract

In this paper, a circuit employing current controlled current conveyor trans-conductance amplifiers (CCCCTAs) as active element is proposed which can function both as biquad filter and oscillator. It uses two CCCCTAs and two capacitors. As a biquad filter it can realizes all the standard filtering functions (low pass, band pass, high pass, band reject and all pass) in voltage-mode and provides the feature of electronically and orthogonal control of pole frequency and quality factor through biasing current(s) of CCCCTAs. The proposed circuit can also be worked as oscillator without changing the circuit topology. Without any resistors and using capacitors, the proposed circuit is suitable for IC fabrication. The validity of proposed filter is verified through PSPICE simulations.