Dual-mode multifunction filter realized with a single voltage differencing gain amplifier (VDGA)
Keywords:Voltage Differencing Gain Amplifier (VDGA), Multifunction filter, Dual-mode operation, Electronically tunable circuit, Analog filter
AbstractThis 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.
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