Class D ampli ers can represent signals with three di erent output levels, +V_cc, 0, -V_cc, with no distortion. Exploiting this in order to achieve a better performance with no switching frequency increase, an extension to the classic Pulse Width Modulation two level A/D conversion is proposed. Coding is achieved by extending output waveforms of a Trellis based Sigma Delta Modulation to three levels. Simulation results have shown that, using the same symbol rate, a three level pattern achieved from 3:7 to 8:2 dB of SINAD improvement and a power consumption up to 5 times smaller.

Authors: Ausiello, Ludovico; Rovatti, Riccardo; Setti, Gianluca
Affiliations: ARCES University of Bologna; ENDIF University of Ferrara(See document for exact affiliation information.)
AES Convention: 120 (May 2006) Paper Number: 6696
Publication Date: May 1, 2006 Import into BibTeX
Session Subject: Signal Processing; High Resolution Audio
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=13500

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