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

This article presents the dual-mode multifunction biquad filter realized employing only a single voltage differencing gain amplifier (VDGA), one resistor and three capacitors. The proposed filterwith one input and three outputs can configure as voltage-mode or current-mode filter circuit with the 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 (o) 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-m CMOS process parameters

Voltage-mode multifunctional biquadratic filter using single DVCC and minimum number of passive elements

703-707A voltage-mode multifunctional biquadratic filter with three input terminals and single output terminal is presented. The proposed circuit is constructed using only one differential voltage current conveyor (DVCC) as active element and minimum number of passive elements, namely two resistors and two capacitors. The circuit can simultaneously realize all five different biquadratic filtering lowpass, bandpass, highpass, bandstop and allpass responses from the same configuration. The non-ideal effects of the presented filter are examined. PSPICE simulations of the proposed circuit are included using 0.35-mm CMOS technology from TSMC

Minimum-component current-mode universal filter

137-141This paper describes a current controllable current-mode universal filter with three inputs and one output using multi-output current-controlled current conveyors (MOCCCIIs). The proposed circuit consists of the minimum number of active and passive components, i.e. two MOCCCIIs and two grounded capacitors; simultaneous realization of all the standard filtering functions; independent current-control of the natural angular frequency (wo) and bandwidth (BW); no requirement of component matching conditions; and low passive and active sensitivities

Universal voltage-mode SIFO-type biquad with fully MOS-C realization using DDCCTAs

516-522An electronically tunable universal voltage-mode biquad filter which is based on using the newly introduced active building block, namely differential difference current conveyor transconductance amplifier (DDCCTA) is presented in the present paper. The proposed circuit having single input and five output (SIFO) terminals uses two DDCCTAs, two grounded capacitors and two electronic resistors suitable for MOS-C realization. The circuit realizes all the five standard biquadratic filter functions simultaneously without changing circuit topology. In addition, the circuit features the high-input impedance terminal, an electronic control of its natural angular frequency and quality factor. The workability of the proposed circuit has been verified using PSPICE simulations based on CMOS DDCCTA implemented in 0.5 <span style="font-family:Symbol; mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:"times="" roman";="" mso-char-type:symbol;mso-symbol-font-family:symbol"="" lang="EN-GB">mm MIETEC CMOS technology. </span