A Suboptimal Nonlinear Duty-cycle Modulation Scheme

Abstract

The DCM (duty-cycle modulation) technique is increasingly used in industrial electronics applications, including instrumentation systems, interfacing drivers and signal transmission chains. However, in existing research works related to new applications of DCM technique, the linear approximation policy is used for the sake of structural simplicity and low implementation cost, at the expends of rigorous analysis and low approximation errors. In this paper, a suboptimal nonlinear DCM scheme is developed. It is founded on a global least square cubic fitting model of the intractable original nonlinear duty-cycle structure. The simpler nonlinear demodulation model obtained consists of a single linear low-pass filter, which is connected in series to a static amplifier with cubic input-output characteristic. The novelty of this paper results from a suboptimal tradeoff, between a simplified model of the DCM scheme and the mean square approximation error. The virtual simulation results obtained under a variety of modulating inputs with arbitrary waveforms have shown the effectiveness of the proposed suboptimal DCM architecture. Compared to a linear approximation technique, the suboptimal cubic scheme provides higher performances, including SSE (statistics sum of error), MSE (mean square error), THD (total harmonics distortions), SINAD (signal-to-noise distortion ratio), and SFDR (spurious free dynamic range). Therefore, the proposed suboptimal DCM architecture might be used to solve a variety of signal processing problems in industrial electronics.

Keywords: Modulation, nonlinear duty-cycle, suboptimal model, virtual simulation, electronics

 Cite this Article

Jean Mbihi, Charles Hubert Kom, Léandre Nneme Nneme. A Suboptimal Nonlinear Duty-cycle Modulation Scheme. Journal of Electronic Design and Technology. 2016; 7(1): 22–31p.