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1. 发明授权

US07907010B2 Digital amplifier 有权
标题翻译：数字放大器
公开(公告)号：US07907010B2
公开(公告)日：2011-03-15
申请号：US10552060
申请日：2004-03-25
申请人： Matthias Wendt , Iain Mosely , F. Javier Esguevillas , Thomas Dürbaum , Georg Sauerländer , Heinz Van Der Broeck
发明人： Matthias Wendt , Iain Mosely , F. Javier Esguevillas , Thomas Dürbaum , Georg Sauerländer , Heinz Van Der Broeck
IPC分类号： H03F3/217
CPC分类号： H03F3/2173 , H03F1/0227 , H03F1/304 , H03F1/3264 , H03F2200/459
摘要： Recently, the use of class-D audio amplifiers has become more and more widespread. In contrast to the generally employed class-AB linear amplification technology, class-D allows for improved efficiency. However, the class-D principle is known for its poor distortion characteristics. According to the present invention a digital amplifier (18) is provided for converting an audio signal to a power output, comprising a ripple suppression circuit (16) for suppressing voltage ripples in a supply voltage supplied to the bridge circuit with (6) at least one pair of switches. The ripple suppression circuit (16) suppresses ripples in the supply voltage supplied to a switch in the bridge circuit (6), which has been found to cause a major part of the distortions in the output signal of the digital amplifier (18).
摘要翻译：近来，D类音频放大器的使用越来越广泛。与通常使用的AB类线性放大技术相反，D类允许提高效率。然而，D类原理由于其差的失真特性而已知。根据本发明，提供一种数字放大器（18），用于将音频信号转换成功率输出，包括纹波抑制电路（16），用于抑制至少提供至（6）至桥电路的电源电压中的电压波动一对开关纹波抑制电路（16）抑制提供给桥式电路（6）中的开关的电源电压中的波纹，其已被发现导致数字放大器（18）的输出信号中的大部分失真。

2. 发明授权

US07518450B2 Digital amplifier 有权
标题翻译：数字放大器
公开(公告)号：US07518450B2
公开(公告)日：2009-04-14
申请号：US10552057
申请日：2004-03-25
申请人： Matthias Wendt , Iain Mosely , F. Javier Esguevillas
发明人： Matthias Wendt , Iain Mosely , F. Javier Esguevillas
IPC分类号： H03F3/217
CPC分类号： H03F3/217 , H03F1/32 , H03F3/2173 , H03F2200/03
摘要： Recently, the use of class D audio amplifiers has become more and more widespread. In contrast to the generally employed class AB linear amplification technology, class D allows for improved efficiency. However, the class D principle is known for its poor distortion characteristics. According to the present invention, switching delays of the end stage (6) are measured and used for compensating distortions caused by the dead time of the end stage (6). This is done by modifying the switching delay of the power stage. In this way, the output pulse duration is corrected to reflect the input duty cycle. Advantageously, variations in the switching-time due to device property spread, aging, current and temperature may be compensated.
摘要翻译：近来，使用D类音频放大器已经越来越普及。与通常使用的AB类线性放大技术相反，D类允许提高效率。然而，D类原理由于其差的失真特性而已知。根据本发明，测量端级（6）的切换延迟并用于补偿由端级（6）的死区引起的失真。这是通过修改功率级的开关延迟来完成的。以这种方式，校正输出脉冲持续时间以反映输入占空比。有利地，可以补偿由于器件特性扩展，老化，电流和温度引起的切换时间的变化。

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