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báo cáo hóa học:" Research Article Mixed-Signal Architectures for High-Efficiency and Low-Distortion Digital Audio Processing and Power Amplification"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Mixed-Signal Architectures for High-Efficiency and Low-Distortion Digital Audio Processing and Power Amplification | Hindawi Publishing Corporation EURASIP Journal on Embedded Systems Volume 2010 Article ID 394070 11 pages doi 10.1155 2010 394070 Research Article Mixed-Signal Architectures for High-Efficiency and Low-Distortion Digital Audio Processing and Power Amplification Sergio Saponara and Pierangelo Terreni Department of Information Engineering University of Pisa via Caruso 16 56122 Pisa Italy Correspondence should be addressed to Sergio Saponara sergio.saponara@iet.unipi.it Received 9 June 2009 Accepted 4 August 2009 Academic Editor Paolo D Abramo Copyright 2010 S. Saponara and P. Terreni. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. The paper addresses the algorithmic and architectural design of digital input power audio amplifiers. A modelling platform based on a meet-in-the-middle approach between top-down and bottom-up design strategies allows a fast but still accurate exploration of the mixed-signal design space. Different amplifier architectures are configured and compared to find optimal trade-offs among different cost-functions low distortion high efficiency low circuit complexity and low sensitivity to parameter changes. A novel amplifier architecture is derived its prototype implements digital processing IP macrocells oversampler interpolating filter PWM cross-point deriver noise shaper multilevel PWM modulator dead time compensator on a single low-complexity FPGA while off-chip components are used only for the power output stage LC filter and power MOS bridge no heatsink is required. The resulting digital input amplifier features a power efficiency higher than 90 and a total harmonic distortion down to 0.13 at power levels of tens of Watts. Discussions towards the full-silicon integration of the mixed-signal amplifier in embedded devices using BCD technology and targeting power levels of few Watts