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Appl. Sci. 2017, 7(2), 179; doi:10.3390/app7020179

Voltage-Mode and Current-Mode Resistorless Third-Order Quadrature Oscillator

1
Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan
2
Department of Electronic Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
*
Author to whom correspondence should be addressed.
Received: 31 December 2016 / Accepted: 6 February 2017 / Published: 13 February 2017
(This article belongs to the Section Energy)

Abstract

This paper presents the realization of a resistorless third-order quadrature oscillator using two multiple-output current controlled current conveyor transconductance amplifiers (MO-CCCCTAs) and three grounded capacitors. The proposed circuit provides two quadrature voltage outputs, two high-impedance quadrature current outputs, and one high-impedance amplitude-controllable current output. The proposed oscillator satisfies the industrial requirement for amplifier and modulation signals and phase shift keying signals, when the input bias current of the second MO-CCCCTA is used as a modulating signal. Its oscillation condition and oscillation frequency can be adjusted independently by two different bias currents of MO-CCCCTAs. The structure of resistorless and only grounded capacitors suggests that the proposed oscillator can be easily implemented in an integrated circuit. View Full-Text
Keywords: quadrature oscillator; CCCCTA; voltage-mode; current-mode; modulation. quadrature oscillator; CCCCTA; voltage-mode; current-mode; modulation.
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chen, H.-P.; Hwang, Y.-S.; Ku, Y.-T. Voltage-Mode and Current-Mode Resistorless Third-Order Quadrature Oscillator. Appl. Sci. 2017, 7, 179.

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