Pattern Search Algorithms for Bound Constrained Minimization
SIAM Journal on Optimization
Muiltiobjective optimization using nondominated sorting in genetic algorithms
Evolutionary Computation
High-efficiency dynamic supply CMOS audio power amplifier for low-power applications
Microelectronics Journal
Metaheuristics: From Design to Implementation
Metaheuristics: From Design to Implementation
Highest Efficiency and Super Quality Audio Amplifier using MOS Power FETS in Class G Operation
IEEE Transactions on Consumer Electronics
Average Efficiency of Class-G Power Amplifiers
IEEE Transactions on Consumer Electronics
IEEE Transactions on Consumer Electronics
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We present an optimization of the voltage scaling algorithm in low power audio class-G amplifier for headphones application to allow longer playback time. The optimization approach minimizes the voltage difference between the internal audio amplifier power supply and its output signal over a large range of operating conditions. The modeling is based on a behavioral model enabling accurate and rapid evaluation of efficiency and audio quality with realistic input stimuli. The model validated in practice is used to optimize the voltage scaling using only few power supply levels. Thanks to a global search algorithm followed by a local one, the optimization gives the better parameters for voltage scaling algorithm while keeping a good audio quality. The proposed configuration increases the efficiency up to 48% at nominal operation.