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1. 发明授权

US08633763B2 Output circuits with class D amplifier 有权
标题翻译： D类放大器的输出电路
公开(公告)号：US08633763B2
公开(公告)日：2014-01-21
申请号：US13198642
申请日：2011-08-04
申请人： Brett C Walker , Song Stone Shi
发明人： Brett C Walker , Song Stone Shi
IPC分类号： H03F3/68
CPC分类号： H03F3/217 , H03F2200/03 , H03F2200/345 , H03F2200/351
摘要： Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square wave signal instead of a sawtooth or triangular wave signal. In another aspect, a PDM output circuit includes a PDM modulator that uses variable reference voltages to reduce variations in switching frequency. In yet another aspect, a dual-mode output circuit supports both PWM and PDM and includes a pulse modulator and a class D amplifier. The pulse modulator performs PWM on an input signal if a PWM mode is selected and performs PDM on the input signal if a PDM mode is selected. The class D amplifier receives a driver signal from the pulse modulator and generates an output signal.
摘要翻译：描述使用脉冲宽度调制（PWM）和/或脉冲密度调制（PDM）的输出电路。一方面，PWM输出电路包括基于方波信号而不是锯齿波或三角波信号进行操作的PWM调制器。在另一方面，PDM输出电路包括使用可变参考电压以减少开关频率变化的PDM调制器。另一方面，双模输出电路支持PWM和PDM，并且包括脉冲调制器和D类放大器。如果选择了PWM模式，则脉冲调制器对输入信号执行PWM，如果选择了PDM模式，则在输入信号上执行PDM。 D类放大器从脉冲调制器接收驱动信号并产生一个输出信号。

2. 发明授权

US08536938B2 Output circuits with class D amplifier 有权
标题翻译： D类放大器的输出电路
公开(公告)号：US08536938B2
公开(公告)日：2013-09-17
申请号：US13198637
申请日：2011-08-04
申请人： Brett C Walker , Song Stone Shi
发明人： Brett C Walker , Song Stone Shi
IPC分类号： H03F3/38
CPC分类号： H03F3/217 , H03F2200/03 , H03F2200/345 , H03F2200/351
摘要： Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square wave signal instead of a sawtooth or triangular wave signal. In another aspect, a PDM output circuit includes a PDM modulator that uses variable reference voltages to reduce variations in switching frequency. In yet another aspect, a dual-mode output circuit supports both PWM and PDM and includes a pulse modulator and a class D amplifier. The pulse modulator performs PWM on an input signal if a PWM mode is selected and performs PDM on the input signal if a PDM mode is selected. The class D amplifier receives a driver signal from the pulse modulator and generates an output signal.
摘要翻译：描述使用脉冲宽度调制（PWM）和/或脉冲密度调制（PDM）的输出电路。一方面，PWM输出电路包括基于方波信号而不是锯齿波或三角波信号进行操作的PWM调制器。在另一方面，PDM输出电路包括使用可变参考电压以减少开关频率变化的PDM调制器。另一方面，双模输出电路支持PWM和PDM，并且包括脉冲调制器和D类放大器。如果选择了PWM模式，则脉冲调制器对输入信号执行PWM，如果选择了PDM模式，则在输入信号上执行PDM。 D类放大器从脉冲调制器接收驱动信号并产生一个输出信号。

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