Single VDCC-Based Electronically Tunable Voltage-Mode Second Order Universal Filter

Abstract

A design of second-order multiple-input single-output voltage-mode universal filter is presented in this paper. The proposed filter consists of single voltage differencing current conveyor (VDCC), single resistor and two capacitors. The new circuit provides five filter responses namely, lowpass, high-pass, band-pas, band-reject and all-pass functions. Each output filter response can be selected without the requirement of the matching condition and double gain amplifier for selecting all-pass function. The tuning of natural frequency and quality factor can be electronically done. The proposed circuit only uses single active element, which can be easily implemented as an integrated circuit. The MOS modeling of VDCC and Pspice simulation of proposed filter were carried out on TSMC 0.18 micrometer CMOS technology. Streszczenie. Opisano uniwersalny filtr drugiego rzędu wykorzystujący układ VDCC (voltage differencing current conveyor). Częstotliwość graniczną filtru i jego dobroćmoga być dobierane elektronicznie. Zaproponowany filtr opracowano w technologii CMOS 0.18 mikrometra. Uniwersalny strojony filtr drugiego rzędu wykorzystujący technologię VDCC

Voltage Differencing Current Conveyor Based Voltage-Mode and Current-Mode Universal Biquad Filters with Electronic Tuning Facility

“…The performance parameters of the designed filters are summarized and compared with other previously published related works [1,[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] in Table 4. It depicts that the designed filters consume least power among all the other circuits.…”

“…In addition, not all of the basic filter responses can be provided in references [25,27] and in parts of references [7,20]. Furthermore, the quality factor in [1,8,25,[27][28] is not independently tunable with the pole frequency. Also, double/inverted input signals are required in [6,8,9,17,20,21,28].…”

“…Furthermore, the quality factor in [1,8,25,[27][28] is not independently tunable with the pole frequency. Also, double/inverted input signals are required in [6,8,9,17,20,21,28]. A relatively large pole frequency with a lower power supply is offered in [17], but to achieve this one, it is necessary to pay for THD (2.5% up to 50 µA in [17]; 2.37% up to 200 µA for proposed works) and power consumption.…”

“…The VDCC based universal filter reported in [28] offers only voltage outputs. The pole frequency and quality factor are not independently tunable for this configuration.…”