Dual-mode multifunction filter realized with a single voltage differencing gain amplifier (VDGA)

Authors

  • Worapong Tangsrirat Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL)
  • Tattaya Pukkalanun Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL)
  • Orapin Channumsin Faculty of Engineering, Rajamangala University of Technology Isan, Khonkaen Campus

Keywords:

Voltage Differencing Gain Amplifier (VDGA), Multifunction filter, Dual-mode operation, Electronically tunable circuit, Analog filter

Abstract

This article presents the dual-mode multifunction biquad filter realized employing only single voltage differencing gain amplifier (VDGA), one resistor and three capacitors.  The proposed filter having one input and three outputs can configure as voltage-mode or current-mode filter circuit with appropriate input injection choice. It can also synthesis the three standard filter functions, which are highpass, bandpass and lowpass responses without modifying the circuit configuration. Orthogonal adjustment between the natural angular frequency (wo) and the quality factor (Q) of the filter is achieved. Detail analysis of non-ideal VDGA effects and circuit component sensitivity are included. The circuit principle is verified by means of simulation results with TSMC 0.35-mm CMOS process parameters.   

Author Biographies

Worapong Tangsrirat, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL)

Department of Instrumentation and Control Engineering

Tattaya Pukkalanun, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL)

Department of Instrumentation and Control Engineering

Orapin Channumsin, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkaen Campus

Department of Electronics and Telecommunication Engineering

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Published

2021-11-25

Issue

Engineering Review, Vol. 41, No. 2

Section

Articles

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