Hybrid Linearized Class-BD Double Sided (LBDD) Digital Pulse Width Modulator (DPWM) for Class-BD Audio Amplifiers
Journal Title: Science, Technology and Innovation - Year 2017, Vol 1, Issue 1
Abstract
The paper presents an original architecture and implementation of 9-bit LBDD hybrid DPWM circuit for Class-BD digital audio amplifier. The input PCM signals are directly transformed into 24-bit LBDD DPWM signals and then are requanized to the 9-bit digital outputs using noise-shaping process to support high fidelity with practical values of time resolution, and finally are converted by the DTCs into the two physical trains of 1-bit PWM signals. The architecture of the proposed Class-BD hybrid DPWM circuit is composed of two Class-AD ones. The hybrid quantizer converts 6 MSB bits using counter method, based on the STM32F407xx microcontroller, while the remaining 3 LSB bits - using a method based on the Programmable Tapped Delay Line (PTDL). All necessary time waveforms are generated on the base of the internal microcontroller oscillator 168 MHz. The proposed 9-bit Class-DB DPWM circuit allows to attain SNR of 110 dB and THD about 0,2% within the audio baseband, at switching frequency of 328.1 kHz, clock frequency of 42 MHz and modulation index M = 0.95. Basic verification of algorithm and circuit operation as well as simulation and preliminary experimental results have been performed.<br/><br/>
Authors and Affiliations
Stanisław Kuta, Wojciech Kołodziejski, Jacek Jasielski
Keywords
Related Articles
- EP ID EP248205
- DOI 10.5604/01.3001.0010.7555
- Views 143
- Downloads 0
Synthesis, structure and properties of V(IV) complex with N’-[(E)-(2,3-dihydroxyphenyl)metylidene]-2-phenylacetohydrazide
The synthesis and physicochemical properties of new vanadium(IV) complex of formula [VO(L)(phen)] is described. The L denotes ONO tridentate Schiff base derived from 2,3-dihydroxybenzaldehyde and phenylacetic hydrazide,...
Optimal digital control of an uncertain parameter 2nd order plant
In the paper a construction of a control system for 2nd order, uncertain-parameter plant is discussed. The considered model of the plant is described by state space equation or by equivalent transfer function and it desc...
Markov inequality on the graph of holomorphic function
The purpose of this paper is to show that the Markov inequality does not hold on the graph of holomorphic function.<br/><br/>
Wpływ odchyleń napięcia sieci energetycznej na sprawność silników indukcyjnych
Celem pracy było wykonanie pomiarów laboratoryjnych dla określenia wpływu wartości napięcia zasilającego na sprawność silnika indukcyjnego. Obiektem badanym był silnik indukcyjny pierścieniowy małej mocy w warunkach stał...
State estimators and observers for continuous and discrete linear systems. Part 1. Differential asymptotic state estimators
In the paper an overview of state estimators and state observers used in linear systems, will be presented. The state estimators and observers can be used in many applications like the state reconstruction for the contro...