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Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA

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Abstract

This article introduces a circuit which can function both as a quadrature oscillator and as a universal biquad filter (lowpass, highpass, bandpass). When the circuit functions as a universal biquad filter, the quality factor and pole frequency can be tuned orthogonally via the input bias currents. When it functions as a quadrature oscillator, the oscillation condition and oscillation frequency can be adjusted independently by the input bias currents. The proposed circuit can work as either a quadrature oscillator or a biquad filter without changing the circuit topology. The amplitude of the proposed oscillator can be independently controlled via the input bias currents. The proposed oscillator can be applied to provide amplitude modulated/amplitude shift keyed signals with the above-mentioned major advantages. The circuit is very simple, consisting of four dual-output second generation current controlled current conveyors (DO-CCCIIs), one operational transconductance amplifier (OTA), and two grounded capacitors. Without any external resistors and using only grounded elements, this circuit is therefore suitable for IC architecture. PSPICE simulation results are depicted here, and the given results agree well with the theoretical analysis. The power consumption is approximately 7.32 mW at ±2.5 V supply voltages.

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Authors and Affiliations

  1. Department of Teacher Training in Electrical Engineering, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok, Bangsue, Bangkok, 10800, Thailand

    Montree Siripruchyanun

  2. Electric and Electronic Program, Faculty of Industrial Technology, Suan Sunandha Rajabhat University, Dusit, Bangkok, 10300, Thailand

    Winai Jaikla

Authors
  1. Montree Siripruchyanun
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  2. Winai Jaikla
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Correspondence to Montree Siripruchyanun.

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Siripruchyanun, M., Jaikla, W. Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA. Circuits Syst Signal Process 28, 99–110 (2009). https://doi.org/10.1007/s00034-008-9072-5

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  • DOI: https://doi.org/10.1007/s00034-008-9072-5

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