Title :
Efficiency of low power audio amplifiers and loudspeakers
Author :
Burrow, S. ; Grant, D.
Author_Institution :
Bristol Univ., UK
fDate :
8/1/2001 12:00:00 AM
Abstract :
We look at the load presented to audio amplifiers by real transducers. We consider the power losses in class-AB and class-D amplifier topologies, and determine that in order to predict efficiency it is necessary to consider the amplifier/transducer combination. The ability of the class-D amplifier to recycle quadrature load current offers new ways to improve efficiency
Keywords :
acoustic transducers; audio-frequency amplifiers; loudspeakers; network topology; EM loudspeakers; amplifier/transducer combination; audio amplifier efficiency; audio amplifier load; class-AB amplifier topology; class-D amplifier topology; loudspeaker efficiency; low power audio amplifiers; power losses; quadrature load current; transducer load; Equations; Filters; Impedance; Loudspeakers; Multiple signal classification; Operational amplifiers; Power amplifiers; Topology; Transducers; Voltage;
Journal_Title :
Consumer Electronics, IEEE Transactions on
