Optimal Duty-Cycle Modulation Scheme for Analog-To-Digital Conversion Systems
This paper presents an optimal duty-cycle modulation (ODCM) scheme for analog-to-digital conversion (ADC) systems. The overall ODCM-Based ADC problem is decoupled into optimal DCM and digital filtering sub-problems, while taking into account constraints of mutual design parameters between the two. Using a set of three lemmas and four morphological theorems, the ODCM sub-problem is modelled as a nonlinear cost function with nonlinear constraints. Then, a weighted least pth norm of the error between ideal and predicted frequency responses is used as a cost function for the digital filtering sub-problem. In addition, MATLAB fmincon and MATLAB iirlnorm tools are used as optimal DCM and least pth norm solvers respectively. Furthermore, the virtual simulation scheme of an overall prototyping ODCM-based ADC system is implemented and well tested with the help of Simulink tool according to relevant set of design data, i.e., 3 KHz of modulating bandwidth, 172 KHz of maximum modulation frequency and 25 MHZ of sampling frequency. Finally, the results obtained and presented show that the ODCM-based ADC achieves under 3 KHz of modulating bandwidth: 57 dBc of SINAD (signal-to-noise and distorsion), 58 dB of SFDR (Surpious free dynamic range) -80 dBc of THD (total harmonic distorsion), and 10 bits of minimum resolution. These performance levels appear to be a great challenge within the class of oversampling ADC topologies, with 2nd order IIR (infinite impulse response) decimation filter.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1315523Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 619
 H. Inose, Y. Yasuda and J. Marakami, “A telemetering system by code modulation, delta-sigma modulation,” IRE Trans. on Space, Electronics and Telemetry, SET-8, pp. 204-209, Sept 1962.
 N. Doley and A. Kornfeld, “Comparison of Sigma-Delta converter circuit architectures in digital CMOS technology”, Journal of circuits, systems ans computers”, vol. 14, No 3, pp. 515-532, © World scientific publishing company, 2005.
 J. Mbihi, B. Ndjali, and M. Mbouenda, “Modelling and simulations of a class of duty cycle modulators for industrial instrumentation,” Iranian J. Electr. Comput. Eng., vol. 4, no. 2, pp. 121–128, 2005.
 Mbihi, J., Ndjali Beng, F., Kom, M., and Nneme Nneme, L. “A novel analog-to-digital conversion technique using nonlinear duty-cycle modulation”, International Journal of electronics and computer science engineering, 1(3), 2012, pp. 818-825.
 I. Mbihi, L. Nneme Nneme, “A Multi-Channel Analog-To-Digital Conversion Technique Using Parallel Duty-Cycle Modulation”. International Journal of Electronics and Computer Science Engineering. 2012; 1(3):826–833p.
 Nneme Nneme L., Mbihi J. “Modeling and Simulation of a New Duty–Cycle Modulation Scheme for Signal Transmission System”, American Journal of Electrical and Electronic Engineering (AJEEE).2014;2(3):82.
 Moffo Lonla B., Jean Mbihi, Leandre Nneme Nneme, “Low Cost and High Quality Duty–Cycle Modulation Scheme and Applications”. International Journal of Electrical, Computer, Energetic, Electronic and communication Engineering. 2014; 8(3):82–88p.
 Moffo Lonla B., Mbihi J., Nneme Nneme L., Kom M. “A Novel Digital–to–Analog Conversion Technique using Duty-Cycle Modulation”. International Journal of Circuits, Systems and Signal processing. 2013; 7(1):42–49p –87p.
 Moffo Lonla B., Mbihi J. A, “Nouvelle technique de coversion N/A des signaux par modulation numérique en rapport cyclique et applications en instrumentation virtuelle”, Ph/D thesis, ENSET, University of Douala, July 2016.
 Moffo Lonla B., Mbihi J. A. “Novel Digital Duty–Cycle Modulation Scheme for FPGA-Based Digital-to-Analog Conversion,” IEEE Transaction on circuits and system II. 2015; 62(6):543–547p.