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1. 发明授权

US08553909B2 Low-power class D amplifier using multistate analog feedback loops 有权
标题翻译：低功耗D类放大器，采用多态模拟反馈回路
公开(公告)号：US08553909B2
公开(公告)日：2013-10-08
申请号：US13097690
申请日：2011-04-29
申请人： Justin L. Fortier , Ralph D. Mason , Renyuan Li , Christopher A. DeVries , Peter H. R. Popplewell , William Kung
发明人： Justin L. Fortier , Ralph D. Mason , Renyuan Li , Christopher A. DeVries , Peter H. R. Popplewell , William Kung
IPC分类号： H03F99/00
CPC分类号： H03F3/217
摘要： An audio amplifier system may include an audio CODEC/output (AOP) path featuring analog class-D amplifiers, and using Natural Sampling Pulse Width Modulation (PWM) to convert an analog input into a series of Rail-to-Rail pulses. The audio signal may be encoded in the average value of the PWM pulse train and may be recovered from the PWM signal by analog low pass filtering. The Class-D amplifiers may be designed with a negative feedback loop/network to compare the output signal with the input signal and suppress non-idealities introduced by the Class-D switching stage. Furthermore, operation of the AOP may be designed according to a separate signal transfer function and a separate noise transfer function, and 2nd order noise shaping may be performed at low power, with an optimized filter included in the feedback loop to achieve the best noise reduction at low power. Operation of the amplifier feedback network may be similar to that of a continuous time, low-pass delta-sigma modulator, but with a PWM loop wrapped around the class-D power amplifier.
摘要翻译：音频放大器系统可以包括具有模拟D类放大器的音频CODEC /输出（AOP）路径，并且使用自然采样脉宽调制（PWM）将模拟输入转换成一系列轨至轨脉冲。音频信号可以以PWM脉冲序列的平均值编码，并且可以通过模拟低通滤波从PWM信号中恢复。 D类放大器可以设计有负反馈回路/网络，以将输出信号与输入信号进行比较，并抑制D类切换级引入的非理想性。此外，可以根据单独的信号传递函数和单独的噪声传递函数来设计AOP的操作，并且可以以低功率执行二阶噪声整形，其中包括在反馈环路中的优化滤波器以实现最佳降噪在低功率。放大器反馈网络的操作可能类似于连续时间低通量Δ-Σ调制器的操作，但是使用包围D类功率放大器的PWM环路。

2. 发明申请

US20120275493A1 Low-Power Class D Amplifier Using Multistate Analog Feedback Loops 有权
标题翻译：低功耗D类放大器，采用多态模拟反馈回路
公开(公告)号：US20120275493A1
公开(公告)日：2012-11-01
申请号：US13097690
申请日：2011-04-29
申请人： Justin L. Fortier , Ralph D. Mason , Renyuan Li , Christopher A. Devries , Peter H. R. Popplewell , William Kung
发明人： Justin L. Fortier , Ralph D. Mason , Renyuan Li , Christopher A. Devries , Peter H. R. Popplewell , William Kung
IPC分类号： H04W88/02
CPC分类号： H03F3/217
摘要： An audio amplifier system may include an audio CODEC/output (AOP) path featuring analog class-D amplifiers, and using Natural Sampling Pulse Width Modulation (PWM) to convert an analog input into a series of Rail-to-Rail pulses. The audio signal may be encoded in the average value of the PWM pulse train and may be recovered from the PWM signal by analog low pass filtering. The Class-D amplifiers may be designed with a negative feedback loop/network to compare the output signal with the input signal and suppress non-idealities introduced by the Class-D switching stage. Furthermore, operation of the AOP may be designed according to a separate signal transfer function and a separate noise transfer function, and 2nd order noise shaping may be performed at low power, with an optimized filter included in the feedback loop to achieve the best noise reduction at low power. Operation of the amplifier feedback network may be similar to that of a continuous time, low-pass delta-sigma modulator, but with a PWM loop wrapped around the class-D power amplifier.
摘要翻译：音频放大器系统可以包括具有模拟D类放大器的音频CODEC /输出（AOP）路径，并且使用自然采样脉宽调制（PWM）将模拟输入转换成一系列轨至轨脉冲。音频信号可以以PWM脉冲序列的平均值编码，并且可以通过模拟低通滤波从PWM信号中恢复。 D类放大器可以设计有负反馈回路/网络，以将输出信号与输入信号进行比较，并抑制D类切换级引入的非理想性。此外，可以根据单独的信号传递函数和单独的噪声传递函数来设计AOP的操作，并且可以以低功率执行二阶噪声整形，其中包括在反馈环路中的优化滤波器以实现最佳降噪在低功率。放大器反馈网络的操作可能类似于连续时间低通量Δ-Σ调制器的操作，但是使用包围D类功率放大器的PWM环路。

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