Multiple-input single-output low-input and high-output impedance current-mode biquadratic filter employing five modified CFTAs and only two grounded capacitors |
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Authors: | Xinhua Nie Zhongming Pan |
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Affiliation: | College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha, Hunan 410073, PR China |
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Abstract: | This paper presents a novel current-mode biquadratic filter with three inputs and a single output. The proposed circuit employs five modified current follower transconductance amplifiers (MCFTAs) and only two grounded capacitors. It can realize all five biquadratic filter functions namely: low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) at the output terminal by selecting different input current signals, without requiring any parameter-matching conditions or additional circuits. The filter has an orthogonal electronic adjustment of the natural angular frequency ω0 and the quality factor Q, and it has very low element sensitivities of ω0 and Q. Moreover, the proposed filter has the feature of high output impedance and low input impedance, and the use of only grounded capacitors makes it convenient for integrated circuit implementation. The performances of the proposed circuit are illustrated by PSPICE simulations, and the results are in good agreement with theoretical analysis. |
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Keywords: | Current-mode circuit Current follower transconductance amplifier (CFTA) Biquadratic filter Multiple-input single-output |
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