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This paper describes the theory of operation, mathematical analysis, modeling and circuit design of the true piecewise approximation logarithmic amplifiers. These logarithmic amplifiers can be realized by the series linear limit and parallel summation methods. Both of these methods are discussed in this paper and their transfer functions are extracted. In addition, making use of the proposed formulas,...
This paper describes the operation theory, mathematical analysis and simulation of parallel summation type of the true piecewise approximation logarithmic amplifiers. It also reports a programmable logarithmic amplifier to have a desired logarithmic characteristic in special applications. To design the programmable structure, mathematical analysis of parallel summation type of the true piecewise approximation...
In this paper the design of a nonlinear Hinfin controller for flexible joint robot (FJR) is presented. An approximate solution based on Taylor series expansion is considered for the Hamilton-Jacobi-Isaac (HJI) inequality. A two-degree-of-freedom controller combined of nonlinear Hinfin controller and inverse dynamics controller is proposed to tackle the regulation as well as tracking problem in FJR...
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