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Original scientific paper

https://doi.org/10.30765/er.1547

Practical realization of electronically adjustable universal filter using commercially available IC-based VBDA

Natchanai Roongmuanpha orcid id orcid.org/0000-0003-3188-5481 ; Department of Instrumentation and Control Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand
Tattaya Pukkalanun ; Department of Instrumentation and Control Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand
Worapong Tangsrirat orcid id orcid.org/0000-0002-4588-9523 ; Department of Instrumentation and Control Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand


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Abstract

This paper describes the practical realization of electronically adjustable voltage-mode universal filter with three inputs and single output (TISO) using the commercially available integrated circuit (IC)-based voltage differencing buffered amplifiers (VDBAs). The realization is resistor-less and contains only two VDBAs and two capacitors. The described filter structure can realize all the five standard biquadratic filter functions from the same configuration without needing any component matching criterions. It also exhibits low-output impedance, which enables for easy cascading in voltage-mode operation. Owing to practical VDBA realization, the filter circuit can be easily made electronically tunable with orthogonal o-Q tuning. The effects of the VDBA non-idealities on the filter performance have been analyzed in detail. To prove the theoretical finding, the performance of the studied circuit was also experimentally measured using the operational transconductance amplifier

Keywords

voltage differencing buffered amplifier (VDBA), universal filter, voltage-mode circuits, commercially available ICs, electronically adjustable

Hrčak ID:

247933

URI

https://hrcak.srce.hr/247933

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