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Selecting audio amplifiers for mobile devices

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old account Frank Eory
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re: Selecting audio amplifiers for mobile devices
old account Frank Eory   9/21/2011 8:30:54 PM
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Nice description of some of Wolfson's audio features. Question for the author: Can you please explain what Wolfson means by "Class W" and how this differs from Class G?

wolfson
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re: Selecting audio amplifiers for mobile devices
wolfson   10/12/2011 8:31:59 AM
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Wolfson's Class-G amplifiers switch the supply rail voltage to the amplifier by using a dual-mode charge-pump with variable frequency. This decreases power consumption and increases efficiency. Wolfson's Class-W technology takes this a stage further, and is used in their CODECs, where a digital signal path is present. It includes control logic with predictive signal processing and adaptive dual-mode charge pump. This further reduces power consumption. It also improves audio quality because signal peaks are not clipped and does not introduce extra delays.

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