Power-Law Compensator Design for Plants with Uncertainties: Experimental Verification

A power-law compensator scheme for achieving robust frequency compensation in control systems including plants with an uncertain pole, is introduced in this work. This is achieved through an appropriate selection of the compensator parameters, which guarantee that the Nyquist diagram of the open-loop system compensator-plant crosses a fixed point independent of the plant pole variations. The implementation of the fractional-order compensator is performed through the utilization of a curve-fitting-based technique and the derived rational integer-order transfer function is realized on a Field-Programmable Analog Array device. The experimental results confirm that the the phase margin is well preserved, even for ±40% variation in the pole location of the plant.

DESIGN OF COMPLEX BAND-PASS FILTERS BASED ON PROGRAMMABLE ANALOG INTEGRATED CIRCUITS

Приведена методика расчета и реализации комплексного полосового фильтра с заданными координатами полюсов НЧ-прототипа на базе ПАИС фирмы Anadigm. Моделирование проводилось с помощью САПР AnadigmDesigner2. Описан пример реализации на ПАИС комплексного полосового фильтра Баттерворта 3-го порядка. This article describes the method of calculation and implementation of a complex band-pass filter with the specified coordinates of the poles of the LF-prototypes based on field programmable analog array (FPAA) of company Anadigm. Modeling was carried on with the help of CAD AnadigmDesigner2. An example of implementing a complex third-order Butterworth filter on FPAA is described.

Design and Implementation of Autonomous and Non-Autonomous Time-Delay Chaotic System Based on Field Programmable Analog Array

Time-delay chaotic systems can have hyperchaotic attractors with large numbers of positive Lyapunov exponents, and can generate highly stochastic and unpredictable time series with simple structures, which is very suitable as a secured chaotic source in chaotic secure communications. But time-delay chaotic systems are generally designed and implemented by using analog circuit design techniques. Analog implementations require a variety of electronic components and can be difficult and time consuming. At this stage, we can now solve this question by using FPAA (Field-Programmable Analog Array). FPAA is a programmable device for implementing multiple analog functions via dynamic reconfiguration. In this paper, we will introduce two FPAA-based design examples: An autonomous Ikeda system and a non-autonomous Duffing system, to show how a FPAA device is used to design programmable analog time-delay chaotic systems and analyze Shannon entropy and Lyapunov exponents of time series output by circuit and simulation systems.