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Author: search.filters.author.Lomtong, P.End date: 1979

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    Transition between a flat magnitude and a sharp cut-off lowpass filter
    (1979-01-01)
    Thajchayapong, P.
    ;
    Lomtong, P.
    A Butterworth lowpass filter provides excellent flatness around ω = 0 but the cut-off rate is low. Recently improvements to the cut-off rate have been made by introducing one ripple near the band edge. This paper offers a generalized design technique such that any degree of trade-offs between flat magnitude around ω = 0 and sharp cut-off at the band edge can be obtained while keeping the ratio of the reflected power to the transmitted power at minimum. © 1979 Taylor and Francis Group, LLC.
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    A Recursive Digital Filter with Maximally Flat Linear Phase at an Arbitrary Specified Frequency
    (1978-01-01)
    Thajchayapong, P.
    ;
    Lomtong, P.
    An available recursive digital low-pass filter with constant group delay cannot be spectral transformed to give, for example, a bandpass filter which also has constant group delay. This correspondence describes a technique, using Gauss-Jordan elimination, to design a recursive digital filter with maximally flat linear phase at an arbitrary specified frequency. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.
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    Flat Magnitude Low-Pass Filters with a Pair of Imaginary-Axis Zeros
    (1978-01-01)
    Thajchayapong, P.
    ;
    Lomtong, P.
    It is known that the cutoff rate of a maximally flat low-pass filter can be improved either by introducing a pair of imaginary-axis zeros or relaxing the flatness condition. Making use of both techniques simultaneously, this correspondence describes how to design an nth-order low-pass filter with (n − 2) degree of flatness at ω = 0 rad/s and also including a pair of imaginary-axis zeros. Advantageous performances of the filters obtained are also described. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.
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    A Maximally Flat Group Delay Recursive Digital Filter with Controllable Magnitude
    (1978-01-01)
    Thajchayapong, P.
    ;
    Lomtong, P.
    A recursive digital filter whose group delay approximates a prescribed constant value does not provide a designer with freedom on its magnitude response. This letter presents a simple technique to adjust the magnitude response while retaining its constant group delay characteristics. © 1978 IEEE
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    A Maximally Flat Group Delay Recursive Digital Filter with Chebyshev Stopband Attenuation
    (1978-01-01)
    Thajchayapong, P.
    ;
    Lomtong, P.
    Due to the monotonically decaying nature of its magnitude response, an all-pole recursive digital filter, with its group delay approximating a prescribed constant value, does not exhibit a sharp transition band. Using transformation as the mathematical means, this correspondence describes a design technique for a recursive digital filter with a maximally flat group delay and a Chebyshev attenuation stopband. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.
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    Multiple Diode Constant Current Sources
    (1977-01-01)
    Audom, S. Pookaiy
    ;
    Apichonbancha, P.
    ;
    Lomtong, P.
    ;
    Tantichukeitkul, B.
    A new type of constant current circuit, suitable for the cases of large differences in the reference and the load currents both ways, is proposed and analyzed. Experimental results of a representa tive circuit are also presented. Copyright © 1977 by The Institute of Electrical and Electronics Engineers, Inc.