Method and apparatus for reducing ripple in class D amplifiers

Details Method and apparatus for reducing ripple in class D amplifiers Method and apparatus for reducing ripple in class D amplifiers

2007-01-23

2007-01-23

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P

Reexamination Certificate

active

10908063

ABSTRACT:
Class D amplifiers are used for their high efficiency, but they have some undesirable characteristics, one of these being the residual switching frequency ripple. Embodiments of the present invention comprise methods and apparatuses for reducing the switching frequency ripple using a technique known herein as ripple steering. A secondary output is added to the amplifier for the purpose of steering the switching ripple away from the main output thus substantially relieving the main output from a major artifact of prior art Class D amplifiers.

REFERENCES:
patent: 5117198 (1992-05-01), Morenz
patent: 6388514 (2002-05-01), King et al.
patent: 6778012 (2004-08-01), Kirn
Website www.maxim-ic.com—article entitledClass D Audio Amplifier Output Filter Optimization, pp. 1-7, APP624 of Apr. 1, 2002.
Marshall Leach, Jr.,The Class-D Amplifier, Introduction to Electroacoustics and Audio Amplifier Design, Second Edition—Revised Printing, published by Kendall/Hunt 2001, pp. 1-6.
Lloyd Dixon,Average Current Mode Control of Switching Power Supplies, pp. 5-1 to 5-14.
Converters with Integrated Magnetics, pp. 263-281.
Website www.maxim—article entitledClass D Audio Amplifiers Save Battery Life, APP 1760, Sep. 28, 2002.
Steve Somers, www.extron.com, article entitled Class D Amplifiers—Not ‘Just Audio’ pp. 1-5.

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