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Author: search.filters.author.Wardkein, ParamoteSubject: search.filters.subject.Pulse width modulation

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    Current mode pulse width modulation/pulse position modulation based on phase lock loop
    (2017-05-01)
    Wisartpong, Pichet
    ;
    Silaphan, Vorapong
    ;
    Kurutach, Sunee
    ;
    Wardkein, Paramote
    In this paper, the fully integrated CMOS current mode PLL with current input injects at the place of input or output of the loop filter without summing amplifier circuit. It functions as PPM and PWM circuit is present. In addition, its frequency response is an analysis which electronic tuning BPF and LPF are obtained. The proposed circuit has been designed with 0.18 μm CMOS technology. The simulation results of this circuit can be operated at 2.5 V supply voltage, at center frequency 100 MHz. The linear range of input current can be adjusted from 43 μA to 109 μA, and the corresponding duty cycle of pulse width output is from 93% to 16% and the normalized pulse position is from 0.93 to 0.16. The power dissipation of this circuit is 4.68 mW with the total chip area is 28 μm× 60 μm.
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    A simple synthesis technique of PWM signal
    (2006-12-01)
    Phanphaisarn, Wasu
    ;
    Saechia, Sukkharak
    ;
    Koseeyaporn, Jeerasuda
    ;
    Wardkein, Paramote
    This article proposes a simple and accurate analytical technique for Pulse Width Modulation (PWM) harmonic spectrum whose carrier is asymmetrical ramp signal. The main concept is based on the fact that when a carrier pulse signal has much higher frequency than an information signal, period of the PWM signal is approximately constant. By considering PWM signal as a periodic signal, the one-dimensional exponential Fourier series is thus employed to be an analytical tool for mathematical analysis. The obtained analysis result in a closed form solution can therefore be utilized to easily synthesis the PWM signal. To illustrate the proposed concept, the synthesis results based on the proposed analysis are illustrated. The results show that the proposed analysis is not only a simple technique but also can provide accurate synthesis results. ©2006 IEEE.