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Author: search.filters.author.Loescharataramdee, ChariyaHas files: No

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    H∞ controller design for singularly perturbed systems by delta operator approach
    (2002-01-01)
    Shim, Kyu Hong
    ;
    Loescharataramdee, Chariya
    ;
    Sawan, M. Edwin
    This paper presents a standard H<sup>∞</sup> controller design for singularly perturbed systems with frequency domain by unified approach using the delta operators. Decomposition of the singularly perturbed systems into the fast and slow subsystems is shown. And the delta operator approach is implemented to improve a finite word-length (FWL) characteristics. The delta operator systems have the better FWL characteristics over the shift operator systems. The result is shown in the example.
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    An arbitrary power law device based on integrators
    (2000-12-01)
    Kiranon, Wiwat
    ;
    Loescharataramdee, Chariya
    ;
    Petchakit, Wijittra
    ;
    Sangpisit, Wipa
    A new simple arbitrary power law device implemented from integrators along with the sample-and-hold technique is presented. The number of the integrators indicates the index of the power law. Part of the integrators determine an appropriate time interval to be used to control the sample-and-hold circuit to extract the correct output. To test the validity and value of the proposed method, numerous power law functions have been experimented. The experimental results show very close agreement with the theoretical analysis. In addition, the measurement output, possibly as large as a few volts, is obtained with extreme precision. © 2000 IEEE.
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    A novel derivative envelope detector
    (1998-12-01)
    Sangpisit, Wipa
    ;
    Wardkein, Pramote
    ;
    Kiranon, Wiwat
    ;
    Loescharataramdee, Chariya
    A novel and efficient algorithm for envelope detection based upon Hilbert transformation techniques is presented. The method relies exclusively on using differentiation to approximate Hilbert transformation. The resulting detector is causal and does not require exact knowledge of carrier phase or frequency. The effectiveness of the method is illustrated through investigations of the estimation error performance in comparison with that of the existing detectors. Simulation and experimental results demonstrate the superiority of the proposed method. © 1998 IEEE.
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    H-infinity design for two-Time-scale systems by unified approach using delta operators
    (1998-01-01)
    Shim, Kyu Hong
    ;
    Loescharataramdee, Chariya
    ;
    Sawan, Edwin M.
    In this paper we implement the unified approach using delta operators in the standard H-infinity problem for two-Time-scale systems in the frequency domain. By a unified approach using a delta operator, the procedure and result for the solution is shown to be simpler and more accurate than those of a discrete system using shift operators.
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