Dynamic voltage scaling for series hybrid amplifiers |
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Authors: | Patrice Russo Firas Yengui Gael Pillonnet Sophie Taupin Nacer Abouchi |
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Affiliation: | 1. University of Lyon, Lyon Institute of Nanotechnology (INL-UMR5270), Lyon, France;2. ST Microelectronics, Analog and Power Management Business Unit, Grenoble, France |
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Abstract: | 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. |
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Keywords: | Audio amplifier Optimization Dynamic voltage scaling Hybrid amplifier Class-G/H |
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