A versatile current-mode biquad using operational amplifiers |
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Authors: | Shiwen Yuan Huibin Lu Weidong Shi Fukui Yutaka |
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Affiliation: | (1) Yanshan University, 066004 Qinhuangdao;(2) Tottori University, 680 Koyama, Tottori, Japan |
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Abstract: | A versatile current-mode biquadratic filter using three operational amplifiers and nine passive elements is proposed. By suitably choosing the output branch, lowpass, bandpass, highpass, bandstop and allpass transfer functions are realized simultaneously without changing the circuit configuration and elements. Two circuits, one is for low frequency application and the other for high frequency, are proposed. The center frequency, quality factor and gain constants of the circuit can be tuned independently. Simulated results show that the circuits work successfully. |
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Keywords: | Current-mode circuit Transfer function Biquad filter Operational amplifier |
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