Novel oscillators using current and voltage followers
01 Aug 1998-Journal of The Franklin Institute-engineering and Applied Mathematics (Pergamon)-Vol. 335, Iss: 6, pp 997-1007
TL;DR: In this article, two novel oscillator circuits with both voltage and current outputs are proposed, which are related to each other by the adjoint network theorem, and each oscillator employs a current follower and a voltage follower, and has the advantage of independent control on the frequency of oscillation and the condition of the oscillation.
Abstract: Two novel oscillator circuits with both voltage and current outputs are proposed. The two oscillators are related to each other by the adjoint network theorem. Each oscillator employs a current follower and a voltage follower, and has the advantage of independent control on the frequency of oscillation and the condition of oscillation. A new minimum R,C oscillator with voltage and current outputs is also given. Two new two-resistor two-capacitor, current-mode and voltagemode oscillators are also included. PSpice simulation results illustrating the performance of the oscillator circuits are included.
Citations
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TL;DR: In this paper, two generic classes of chaotic oscillators comprising four different configurations are constructed based on the simplest possible abstract models of generic second-order RC sinusoidal oscillators that satisfy the basic condition for oscillation and the frequency of oscillation formulas.
Abstract: Two generic classes of chaotic oscillators comprising four different configurations are constructed. The proposed structures are based on the simplest possible abstract models of generic second-order RC sinusoidal oscillators that satisfy the basic condition for oscillation and the frequency of oscillation formulas. By linking these sinusoidal oscillator engines to simple passive first-order or second-order nonlinear composites, chaos is generated and the evolution of the two-dimensional sinusoidal oscillator dynamics into a higher dimensional state space is clearly recognized. We further discuss three architectures into which autonomous chaotic oscillators can be decomposed. Based on one of these architectures we classify a large number of the available chaotic oscillators and propose a novel reconstruction of the classical Chua's circuit. The well-known Lorenz system of equations is also studied and a simplified model with equivalent dynamics, but containing no multipliers, is introduced.
240 citations
TL;DR: This paper introduces several novel active RC oscillator circuits using the operational transresistance amplifier (OTRA) as the basic active building block.
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TL;DR: In this article, voltage-mode second order high-Q band pass filters and oscillators which employ only single current differencing buffered amplifier (CDBA) as the active component are proposed.
Abstract: In this paper, voltage-mode second order high-Q band pass filters and oscillators which employ only single current differencing buffered amplifier (CDBA) as the active component are proposed. One of the four filter circuits and two of the four oscillators described have minimum passive component count properties, without using the internal pole of the active element. These BP filters can be easily cascaded without any recourse to impedance matching circuitry. The circuits have been analysed theoretically, simulated and experimentally tested in a laboratory. It is shown that the results of simulations and experimental work are in agreement with theoretical predictions.
43 citations
TL;DR: In this article, the realization of two integrator loop oscillators using Operational Amplifiers (Op Amps) is reviewed and a new additional circuit to provide independent control on the oscillation condition is proposed.
Abstract: The realization of two integrator loop oscillators using Operational Amplifiers (Op Amps) is reviewed and a new additional circuit to provide independent control on the oscillation condition is proposed. Four new grounded capacitor oscillator circuits using unity gain cells and having independent control on the condition of oscillation and on the frequency of oscillation are introduced. The link between the Op Amp based two integrator loop oscillators and three Current Feedback Operational Amplifier (CFOA) based oscillators is detected and clearly explained. This paper serves also as a tutorial paper in introducing the subject of second order two integrator loop oscillators using state variable matrix equation and Nodal Admittance Matrix (NAM) equation.
40 citations
Cites methods from "Novel oscillators using current and..."
...The use of combination of unity gain cells in oscillator circuits has been given in [ 22 , 23]....
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TL;DR: The procedure aims to transfer design issues of analog autonomous chaotic oscillators from the nonlinear domain back to the much simpler linear domain by intentionally modifying sinusoidal oscillator circuits in a semisystematic manner.
Abstract: A design procedure for producing chaos is proposed. The procedure aims to transfer design issues of analog autonomous chaotic oscillators from the nonlinear domain back to the much simpler linear domain by intentionally modifying sinusoidal oscillator circuits in a semisystematic manner. Design rules that simplify this procedure are developed and then two composite devices, namely, a diode-inductor composite and a FET-capacitor composite are suggested for carrying out the modification procedure. Applications to the classical Wien-bridge oscillator are demonstrated. Experimental results, PSpice simulations, and numerical simulations of the derived models are included.
40 citations
References
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TL;DR: In this article, a general class of current amplifier-based biquadratic filter circuits capable of realizing arbitrary filter functions including the low-pass, high-pass and bandpass transfer functions is presented.
Abstract: A general class of current amplifier-based biquadratic filter circuits capable of realizing arbitrary filter functions including the low-pass, high-pass, and bandpass transfer functions is presented. These realizations are derived from a class of well-known low sensitivity single amplifier biquadratic (SAB) filter circuits using the principle of adjoint networks. The salient features of the proposed circuits are that they are synthesized using the same procedure as their op-amp-based SAB circuit counterparts, and they possess the same sensitivities to component variations as the original SAB circuits. However, it is demonstrated experimentally that unlike op-amp-based SAB realizations whose effective operating bandwidth is much less than the unity-gain bandwidth of the op-amp, these current-based filter circuits are effective over the entire bandwidth of the current amplifier. >
117 citations
TL;DR: In this article, the second generation current conveyor was used to realize a low-pass-band-pass filter suitable for VLSI with second-order effects, and simulation results indicated that the performance of both the CCII circuit and the filter over a wide dynamic range.
Abstract: A novel CMOS realization of the second generation current conveyor is given. A circuit which compensates the voltage offset due to channel length modulation effect is then developed. The CCII is then used to realize a new electronically tunable low-pass-band-pass filter suitable for VLSI. Simulation results taking the second-order effects into account indicate the excellent performance of both the CCII circuit and the filter over a wide dynamic range.
104 citations
01 Dec 1989
TL;DR: In this paper, a condition is established under which a current-conveyor circuit and an op-amp circuit can be said to be equivalent, and a procedure is given for generating equivalent Op-amp and current conveyor circuits from a given Op-AMP circuit.
Abstract: Nullors are used to provide a common framework for considering both current-conveyor and operational-amplifier circuits. A condition is established under which a current-conveyor circuit and an op-amp circuit can be said to be equivalent. A procedure is given for generating equivalent op-amp and current-conveyor circuits from a given op-amp (current-conveyor) circuit.
75 citations
TL;DR: In this paper, a new configuration for realising sinusoidal quadrature oscillators using current follower (CF) is presented, where the effects of nonzero-offset voltage and current (at the input and output terminals of a current follower, respectively) on the oscillator are discussed.
Abstract: A new configuration for realising sinusoidal quadrature oscillators using current follower (CF) is presented. The effects of nonzero-offset voltage and current (at the input and output terminals of a current follower, respectively) on the oscillator are discussed. The resulting oscillating frequency is insensitive to the current tracking error of a CF. Simulation results which agree with theoretical analysis are obtained.
74 citations