Recently a renewed interest has been devoted to non integer, or fractional, order systems. This is due to the fact that they well model a lot of physical systems and can be usefully applied in the area of automatic co...
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Recently a renewed interest has been devoted to non integer, or fractional, order systems. This is due to the fact that they well model a lot of physical systems and can be usefully applied in the area of automatic control. On drawback, mainly faced in the area of control systems, is related to their practical realization, essentially due to their infinite dimension nature. In this paper it is proposed an analog implementation of a non integer order integrator by using field programmable analog array. The reported example shows the feasibility and reliability of the proposed approach.
In addition to exhibiting a rich variety of bifurcation and chaos via tuning parameters, a chaotic system introduced by Sprott can be modeled and realized with a fixed Main system block and many different changeable n...
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In addition to exhibiting a rich variety of bifurcation and chaos via tuning parameters, a chaotic system introduced by Sprott can be modeled and realized with a fixed Main system block and many different changeable nonlinear function, blocks such as piecewise-linear function, cubic function and other trigonometric functions. This system is very suitable for implementing a programmable chaos generator according to its changeable nonlinearity. This paper presents a FPAA (field programmable analog array)-based programmable implementation of this system. Nonlinear function blocks used in this chaotic system are modeled with FPAA programming and a model is rapidly changed for realizing other nonlinear functions.
field programmable analog arrays (FPAA) offer the electronic equipment designers new possibilities in quick, interactive and flexible design process, simple verifying, prototyping and modifying of many circuit solutio...
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field programmable analog arrays (FPAA) offer the electronic equipment designers new possibilities in quick, interactive and flexible design process, simple verifying, prototyping and modifying of many circuit solutions. The detailed research results of the selected parameters of the AN221E04 device delivered by Anadigm ® are presented. Some features not mentioned in the data sheets were noted and analyzed, concerning e.g. the device input and output filters. Based on the examined AN221E04 device the example application of the automatic gain control (AGC) circuit was built. The advantages of this design, its obtainable parameters and the problems involved by application of FPAA are presented in the paper.
For practical applications, the fractional order integral and differential operators require to be approximated as stable, causal, minimum-phase integer order systems, which usually leads, in both continuous and discr...
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ISBN:
(纸本)9780791848067
For practical applications, the fractional order integral and differential operators require to be approximated as stable, causal, minimum-phase integer order systems, which usually leads, in both continuous and discrete domains, to high order transfer functions. Assuming that an approximation of good quality is available for the fractional operator, efficient implementations, in both cost and speed, are required. The fast development of the microelectronics gives us the opportunity of using cheap, accurate, programmable and fast devices for implementing reconfigurable analog and digital circuits. Among these devices, fieldprogrammable Gate arrays (FPGAs), Switched Capacitors Circuits (SCCs), and field programmable analog arrays (FPAAs) are used in this paper for the implementation of a fractional order integrator, previously approximated by the recursive Oustaloup's method. The fundamentals of the devices, as well as the design procedures are given, and the implementations are compared considering their simulated frequency responses, the design efforts, and other important issues.
For practical applications, the fractional-order integral and differential operators require to be approximated as stable, causal, minimum-phase integer-order systems, which usually leads, in both continuous and discr...
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For practical applications, the fractional-order integral and differential operators require to be approximated as stable, causal, minimum-phase integer-order systems, which usually leads, in both continuous and discrete domains, to high order transfer functions. Assuming that art approximation of good quality is available for the fractional operator, efficient implementations, in both cost and speed, are required. The fast development of the microelectronics gives us the opportunity of using cheap, accurate, programmable, and fast devices for implementing reconfigurable analog and digital circuits. Among these devices, fieldprogrammable gate arrays, switched capacitor circuits, and field programmable analog arrays are used in this paper for the implementation of a fractional-order integrator, previously approximated by recursive Oustaloups method. The fundamentals of the devices as well as the design procedures are given, and the implementations are compared considering their simulated frequency responses, the design efforts, and other important issues.
We have developed a field programmable analog array (FPAA) that can be configured to synthesis and analyze a vast variety of circuits. This FPAA is a valuable platform for studying nonlinear dynamics in circuits, as i...
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ISBN:
(纸本)9781424409204
We have developed a field programmable analog array (FPAA) that can be configured to synthesis and analyze a vast variety of circuits. This FPAA is a valuable platform for studying nonlinear dynamics in circuits, as it offers close to the flexibility of computer simulation, but with actual experimental results. We present data from a current mirror, a peak detector, and a second-order section.
It is presented an implementation, at the transistor level, of a field programmable analog array using the switched current technique (SI). programmable macro-cell blocks are designed using the class AB grounded gate ...
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ISBN:
(纸本)9781424418466
It is presented an implementation, at the transistor level, of a field programmable analog array using the switched current technique (SI). programmable macro-cell blocks are designed using the class AB grounded gate memory cell which performances have been already improved regarding to SNR and bandwidth. The configurable blocks can be sampled up to 40MHz. The proposed programmable block necessitates only a two-phase clock.
It is presented an implementation, at the transistor level, of a field programmable analog array using the switched current technique (SI). programmable macro-cell blocks are designed using the class AB grounded gate ...
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It is presented an implementation, at the transistor level, of a field programmable analog array using the switched current technique (SI). programmable macro-cell blocks are designed using the class AB grounded gate memory cell which performances have been already improvd regarding to SNR and bandwidth. The configurable blocks can be sampled up to 40MHz. The proposed programmable block necessitates only a two-phase clock.
This paper presents efficient built-in-self-testing (BIST) techniques for programmable capacitor arrays (PCAs) on field programmable analog array (FPAA) platforms. The proposed BIST circuits consist of switched-capaci...
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This paper presents efficient built-in-self-testing (BIST) techniques for programmable capacitor arrays (PCAs) on field programmable analog array (FPAA) platforms. The proposed BIST circuits consist of switched-capacitor (SC) integrators and analog window comparators. Taking advantage of FPAA programmable resources, the proposed PCA BIST circuits can be implemented with very small hardware overhead. Also the impact of comparator threshold variations as well as other circuit parasitic effects on the efficiency of the proposed testing method is investigated. Effective circuit techniques along with new comparator designs are presented to minimize the adverse effect of comparator threshold variations. Finally, procedures for using the proposed BIST method to systematically test all PCAs on an FPAA platform are described and experimental results are presented.
An analog circuit development system as a support in analog circuits design procedure is described. analog circuit can be designed on a personal computer, uploaded to the board via an USB interface and immediately eva...
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ISBN:
(纸本)078037763X
An analog circuit development system as a support in analog circuits design procedure is described. analog circuit can be designed on a personal computer, uploaded to the board via an USB interface and immediately evaluated. The development board is based on Anadigm AN10E40 field programmable analog array (FPAA), which is controlled by a MC68UC908GP32 microcontroller, connected to the USB interface. The board features 4 analog inputs, 4 outputs and 5 selectable input/output lines. The whole system is powered from personal computer over USB 5V power lines by means of a DC-DC converter, so that it does not require any additional power supply. analog circuit design is supported by Anadigm Designer software which also features time domain simulation and filter design tools.
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