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Implementation of Resistorless Universal Biquad Filter with Electronic Controllability DOI:10.15199/48.2019.05.36

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There has been a growing interest to realize the analog active filter using active building block (ABB) [1-5]. The ABB based circuits contain minimum number of passive element. Also, the circuit can be cascaded without the using of external buffer circuit. Particularly, the universal filter which simultaneously gives several filter responses in the same circuit has been continuously proposed. This filter is significant in analog signal processing system such as in the three way crossover network, telephone decoder etc. [6-7]. The voltage-mode universal filers which provide simultaneously various filter responses in the same circuit topology have been recently proposed [8-24]. Some of the proposed filters in [9, 10, 11, 22] contain excessively number of active elements (more than two ABBs). The passive resistor is required for the proposed filter in [8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24]. In [8, 10, 11, 15, 16, 18, 19, 20, 22, 23, 24], the filter parameters, natural frequency and quality factor are not electronically controlled. Also, the quality factor is not tuned independently from the natural frequency [10, 11, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]. The impedance at the input voltage node doesn’t exhibit high [12, 15, 16, 19, 20]. In this paper, the resistorless universal filter which simultaneously provides HP, BP, LP and BR functions is implemented. The proposed circuit is constructed from two M-CCCCTAs and two grounded capacitors. The possibility of electronically and independently adjusting of quality factor and natural frequency is achieved. Theory and Principle Basic Characteristics of M-CCCCTA The conventional CCCCTA is a five-terminal analogue active element. The names of the input and output terminal are represented as y, x, z and o terminals. The y-terminal is the voltage input port with high impedance. The x-terminal which contains controllable parasitic resistance (Rx) is [...]

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