Abstract
This article relates to the realization of voltage-mode and/or current-mode multifunction biquadratic filter and quadrature oscillator circuits each using one voltage differencing gain amplifier (VDGA), two resistors and two grounded capacitors. The proposed dual-mode filter having one output and three inputs can provide the three standard biquadratic transfer functions with both voltage and current output filter responses simultaneously. It also has the independent tuning of the angular resonance frequency and the quality factor . With a slight modification of the proposed filter, a new dual-mode quadrature sinusoidal oscillator can be obtained. The proposed quadrature oscillator provides orthogonal resistive/electronic control of both oscillation condition and oscillation frequency. Non-ideal and parasitic conditions are also examined and their effects on the circuit performance are discussed. In order to confirm the theory, several computer simulation results with PSPICE program are given .
Highlights
Multifunction filters, which can simultaneously realize low-pass (LP), band-pass (BP) and high-pass (HP) filter responses with the same configuration, are fundamental circuit elements widely used in the design of several electronic systems, such as phase-locked loop frequency modulators, crossover networks, stereo demodulators, etc.[1]-[2]
Multifunction biquadratic filters have been designed by using numerous modern electronic active elements, such as second-generation current conveyor (CCII) [1], [5]-[9], differential voltage current conveyor (DVCC) [2]-[3], [10]-[11], differential difference current conveyor (DDCC) [4], differential voltage current conveyor transconductance amplifier (DVCCTA) [12], universal voltage conveyor (UVC) [13], unity gain cells [14]-[15], current-controlled current conveyor (CCCII) [16], voltage differencing gain amplifier (VDGA) [19], voltage differencing transconductance amplifier (VDTA)
Considering the number of input and output terminals, the previously designed configurations in literature can be classified as single-input multi-output (SIMO) [1], [3,4,5,6,7], [11,12,13,14,15], [18], [19], [22,23], multi-input single-output (MISO) [8], [10], [21] and multi-input multioutput (MIMO) [9], [16,17] filter topologies
Summary
Multifunction filters, which can simultaneously realize low-pass (LP), band-pass (BP) and high-pass (HP) filter responses with the same configuration, are fundamental circuit elements widely used in the design of several electronic systems, such as phase-locked loop frequency modulators, crossover networks, stereo demodulators, etc.[1]-[2]. If the type of signal processing is considered, these filters can further be classified as voltage-mode [3,4,5,6,7], [10,11,12,13], [16], [20], current-mode [1,2], [8,9], [14], [17,18], [21], and dualmode [15], [19], [22,23] filter topologies This finding focuses on the design of the dual-mode SIMO multifunction biquad filter with both voltage and current output responses using only a single active element. The possible realization of the dual-mode multifunction biquad filter is not available with any of the previously mentioned QO realizations This contribution led us to the design of the dual-mode multifunction biquad filter and sinusoidal quadrature oscillator which can provide both voltage and current output signals simultaneously. The working of the circuits is evaluated by simulation results
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