High-output-impedance current-mode multiphase sinusoidal oscillator employing current differencing transconductance amplifier-based allpass filters |
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| Authors: | Winai Jaikla Dalibor Biolek Viera Biolkova |
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| Affiliation: | 1. Electric and Electronic Program, Faculty of Industrial Technology, Suan Sunandha Rajabhat University , Dusit, Bangkok, 10300, Thailand;2. Department of Electrical Engineering , Faculty of Military Technology, University of Defence Brno , Kounicova, 65, 612 00, Brno, Czech Republic;3. Department of Microelectronics , Brno University of Technology , Antoninska, Brno, 1, 601 90, Czech Republic;4. Radio Electronics, Faculty of Electrical Engineering and Communication, Brno University of Technology , Antoninska, 1, 601 90, Brno, Czech Republic |
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| Abstract: | This article presents a multiphase sinusoidal oscillator using current differencing transconductance amplifier (CDTA)-based allpass filters. The oscillation condition and oscillation frequency can be orthogonally controlled. The proposed circuit provides 2n – phase signals (n≥2) that are equally spaced in phase and of equal amplitude. The circuit requires one CDTA, two resistors and one capacitor for each phase and no additional current amplifier. Owing to high-output impedances, the proposed circuit enables easy cascading in current-mode configurations. The effects of the nonidealities of the CDTA-allpass sections were also studied. The results of PSpice simulations are presented, demonstrating their consistency with theoretical assumptions. |
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| Keywords: | multiphase sinusoidal oscillator CDTA current-mode |
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