A new biquad filter which simultaneously provides four filter responses, high-pass (HP), band-pass (BP), low-pass (LP) and band-reject (BR) functions is presented in this paper. Two active building blocks used in this implementation is the modified version of current controlled current conveyor transocnductance amplifier (M-CCCCTA) with two grounded capacitors. It doesn't require any external passive resistor. With this structure, it is attractive to fabricate into monolithic chip. The quality factor or bandwidth of the filter is electronically controlled without influencing the natural frequency. The input node feeding the input voltage is high impedance. Pspice simulation results of the presented filter employing the parameter models of the PR200N and NR200N bipolar transistors from AT&T are performed to verify the performances and theoretical analysis.
Słowa kluczowe: M-CCCCTA; Universal filter; Electronic controllability.
W artykule opisano uniwersalny filtr wykorzystujący modyfikowaną wersję wzmacniacza transkonduktancyjnego CCCCTA oraz dwa uzimione kondensatory. Nie są używane zewnętrzne rezystory. Współczynnik dobroci i pasmo są dobierane elektronicznie. Przeprowadzono symulacje układów z tranzystorami bipolarnymi PR200N I NR200N.
Keywords: filtr uniwersalny, układ CCCCTA.
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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