Paper Info
Title
Class-BD audio amplifiers with common-mode free output
Abstract
A new topology of the Class-BD amplifier is proposed. It is composed of the typical H-bridge output stage with four MOSFETs controlled by the optimal NBDD PWM signals and two additional switches separating the H-bridge from the power supply during the time intervals in which either high-side or low-side MOSFETs of the H-bridge are closed at the same time. The differential output of the presented amplifier has the same audio performance as that one using the optimal NBDD modulation, moreover, the power MOSFETs creating the new output H bridge are switching at the same frequency as its prototype. The proposed Class-BD amplifier keeps the CM output constant, thereby removing a major contributor to radiated emissions. Basic feasibility study of the proposed configuration has been performed and compared with the configuration of the Class-BD amplifier using CM Free PSCPWM modulation known in literature on the subject. Experimental models of the considered in the paper Class-BD audio amplifiers have been realized using digital audio MOSFETs IRF6775MTRPbF, single-output gate drivers with self-boost charge pump bias supply and with capacitor-based signal isolation for floating single-output gate drivers. Simulation results are presented.
Year
DOI
Venue
2016
10.1109/MIXDES.2016.7529768
2016 MIXDES - 23rd International Conference Mixed Design of Integrated Circuits and Systems
Keywords
Field
DocType
Class-BD amplifier,PWM,BD modulation,PSCPWM modulation,Common mode signals,EMI,radiated emissions
Computer science,Direct-coupled amplifier,Delta-sigma modulation,Electronic engineering,Linear amplifier,Audio power amplifier,Bridge-tied load,H bridge,Electrical engineering,Pulse-density modulation,Amplifier
Conference
ISBN
Citations 
PageRank 
978-1-5090-3099-6
0
0.34
References 
Authors
7
3
Name
Order
Citations
PageRank
Jacek Jasielski111.11
S. Kuta272.18
Witold Machowski382.87