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Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements

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Abstract

This paper presents a possible usage of the voltage differencing transconductance amplifier (VDTA) for the design of an electronically tunable single-input five-output voltage-mode universal filter. The presented filter is constructed using two VDTAs, two capacitors and two resistors that are all grounded. The circuit simultaneously realizes lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP) filtering responses, without changing the circuit topology. The circuit is capable of providing an independent electronic control of the natural angular frequency (ω 0) and the quality factor (Q) through the transconductance gains of the VDTAs. By simply adjusting the transconductance ratio, a high-Q filter can also be obtained. Because of the high-input impedance of the circuit, it is advantageous for cascade connection. To support the theoretical analysis, the properties of the designed filter have been verified by PSPICE simulation results.

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Acknowledgements

The authors would like to thank the anonymous reviewers for their constructive comments and suggestions. This work was supported by the Office of the Higher Education Commission, Ministry of Education, Thailand, under the research project title “Higher Education Research Promotion”. The support from Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL) is also gratefully acknowledged.

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Authors and Affiliations

  1. Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok, 10520, Thailand

    Jetsdaporn Satansup, Tattaya Pukkalanun & Worapong Tangsrirat

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  1. Jetsdaporn Satansup
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  2. Tattaya Pukkalanun
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  3. Worapong Tangsrirat
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Correspondence to Worapong Tangsrirat.

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Satansup, J., Pukkalanun, T. & Tangsrirat, W. Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements. Circuits Syst Signal Process 32, 945–957 (2013). https://doi.org/10.1007/s00034-012-9492-0

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