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Warianty tytułu
Języki publikacji
Abstrakty
This paper presents a 3rd order 1.5-bit ΣΔ modulator with distributed feedback and local resonator feedback for a Class D audio amplifier. In order to improve the signal-to-noise-and-distortion ratio (SNDR), without increasing the oversampling ratio (OSR) or the order of the modulator, the modulator uses transmission zeros and 1.5-bit quantization. High level simulations of the modulator architecture show that it has a maximum SNDR value of 81 dB, for a signal bandwidth of 18 kHz and a sampling frequency of 1.2 MHz. An electrical circuit is designed to implement the proposed architecture and the electrical simulations show that it has a maximum SNDR value of 76.1 dB. The influence of the constituting blocks of the circuit in the performance of the modulator is investigated using electrical simulations.
Rocznik
Tom
Strony
156--164
Opis fizyczny
Bibliogr. 7 poz.
Twórcy
autor
autor
- Department of Electrical Engineering, Faculty of Sciences and Technology, and with the Center of Technology and Systems (CTS-UNINOVA), New University of Lisbon, 2829-516 Caparica. Portugal, melo@fct.unl.pt
Bibliografia
- [1] Ronan van der Zee, "High efficiency audio power amplifiers, design and practical use," Ph.D. dissertation, Universiteit Twente, 1999.
- [2] S. Brigati, F. Francesconi, P. Malcovati, D. Tonietto, A. Baschirotto, F. Maloberti, "Modeling Sigma-Delta Modulator non-idealities in SIMULINK," Proceedings of ISCAS'99, Vol.2, pp. 384-387, 1999.
- [3] J Pan, LB Yao, and Y Lian, "A Sigma-Delta Class D Audio Power Amplifier in 0.35um CMOS Technology," International SoC Design Conference, Pusan, 24-25 Nov. 2008, South Korea. (Invited Paper).
- [4] Steven R. Norsworthy. Richard Schreier, and Gabor C. Temes, "Delta-Sigma data converters theory, design, and simulation (Book style)." Chapter 4, IEEE Press. 1997.
- [5] Putzeys, Bruno, "Simple Self-Oscillating Class D Amplifier with Full Output Filter Control," Presented at the 118th AES Convention, Barcelona, Spain, May 2005.
- [6] Eric Gaalaas, "Class D Audio Amplifiers: What, Why, and How," Analog Dialogue, Volume 40, June 2006.
- [7] Wylie. F., "Digital audio data compression," Electronics and Communication Engineering Journal, pp. 5-10, February 1995.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-LOD6-0024-0008