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 128
- Downloads 0
Real-time requirements meeting in PLC control system
In the paper a problem of real-time requirements meeting at PLC is presented. Basic parameters associated to real time and factors determining their value were discussed. Real-time reliability indices for PLC and methods...
Cadmium in pork and poultry liver in southern Poland
Samples of pork and poultry livers (ten samples of each type, purchased in southern Poland) were analyzed in order to determine the cadmium concentration. Wet digestion of the samples was carried out and the concentratio...
Bezszczotkowe maszyny prądu stałego z magnesami trwałymi (PMBLDC) ogólnego zastosowania – część I, specyfika konstrukcji, metody analizy
W pracy dokonano oceny własności silnika PMBLDC małej mocy przeznaczonego do napędu roweru. Część pierwsza opracowania poświęcona jest warunkom powstawania momentu, w drugiej przedstawiono wyniki pomiarów i obliczeń SEM,...
Hydrogen peroxide/UV treatment on polylactide/polyurethane blends for biomedical applications
Biodegradable polymers should be non-toxic, possess low immunogenicity and good mechanical properties. Due to their hydrophobicity and their low surface energy cells only poorly attach, spread and proliferate on these bi...
Tridentate hydrazido-hydrazones vanadium complexes. Synthesis, properties and biological activity
Nine new vanadium complexes, with tridentate Schiff base ligand based on 3,5-di-tert-butyl-2-hydroxybenzaldehyde and different hydrazides, are described and characterized. The X-ray crystal structure of complex 8 shows d...