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1. 发明授权

US06943620B2 Delta-sigma amplifiers with output stage supply voltage variation compensations and methods and digital amplifier systems using the same 有权
标题翻译：具有输出级电源电压变化补偿的三角Σ放大器和使用其的数字放大器系统
公开(公告)号：US06943620B2
公开(公告)日：2005-09-13
申请号：US10791181
申请日：2004-03-02
申请人： Jack Andersen , John Laurence Melanson
发明人： Jack Andersen , John Laurence Melanson
IPC分类号： H03F3/217 , H03F3/38
CPC分类号： H03F3/2175 , H03F2200/331
摘要： A delta-sigma modulator for driving an output stage is disclosed. The delta-sigma modulator operates between first and second voltages and includes a loop filter, a quantizer, and a feedback loop coupling an output of the quantizer and an input of the loop filter. The feedback loop includes compensation circuitry for compensating for variations in the first and second voltages in response to a measured average of the first and second voltages and a measured difference between the first and second voltages. Measuring circuitry measures the average and the difference of the first and second voltages.
摘要翻译：公开了用于驱动输出级的Δ-Σ调制器。 Δ-Σ调制器在第一和第二电压之间工作，并且包括环路滤波器，量化器和耦合量化器的输出和环路滤波器的输入的反馈环路。反馈回路包括补偿电路，用于响应于测量的第一和第二电压的平均值和第一和第二电压之间的测量的差值来补偿第一和第二电压的变化。测量电路测量第一和第二电压的平均值和差值。

2. 发明授权

US06741123B1 Delta-sigma amplifiers with output stage supply voltage variation compensation and methods and digital amplifier systems using the same 有权
标题翻译：具有输出级电源电压变化补偿和方法的Delta-sigma放大器及使用其的数字放大器系统
公开(公告)号：US06741123B1
公开(公告)日：2004-05-25
申请号：US10329852
申请日：2002-12-26
申请人： Jack Andersen , John Laurence Melanson
发明人： Jack Andersen , John Laurence Melanson
IPC分类号： H03F338
CPC分类号： H03F3/2175 , H03F2200/331
摘要： A delta-sigma modulator for driving an output stage is disclosed. The delta-sigma modulator operates between first and second voltages and includes a loop filter, a quantizer, and a feedback loop coupling an output of the quantizer and an input of the loop filter. The feedback loop includes compensation circuitry for compensating for variations in the first and second voltages in response to a measured average of the first and second voltages and a measured difference between the first and second voltages. Measuring circuitry measures the average and the difference of the first and second voltages.
摘要翻译：公开了用于驱动输出级的Δ-Σ调制器。 Δ-Σ调制器在第一和第二电压之间工作，并且包括环路滤波器，量化器和耦合量化器的输出和环路滤波器的输入的反馈环路。反馈回路包括补偿电路，用于响应于测量的第一和第二电压的平均值和第一和第二电压之间的测量的差值来补偿第一和第二电压的变化。测量电路测量第一和第二电压的平均值和差值。

3. 发明申请

US20070182486A1 Systems and methods for over-current protection 有权
公开(公告)号：US20070182486A1
公开(公告)日：2007-08-09
申请号：US11340139
申请日：2006-01-26
申请人： Daniel Chieng , Michael Kost , Jack Andersen , Larry Hand
发明人： Daniel Chieng , Michael Kost , Jack Andersen , Larry Hand
IPC分类号： H03F1/52
CPC分类号： H03F1/52 , H03F3/2173
摘要： Systems and methods for over-current protection in all-digital amplifiers using low-cost current sensing mechanisms. An over-current hard clipping unit receives a digital audio signal, clips the signal according to a clip level, and provides the signal to a modulator. The modulator modulates the signal to produce, e.g., a PWM signal and provides the modulated signal to an output stage which generates an output current to drive a speaker. An over-current sensing unit is compares the output current to a threshold value and generates a binary signal indicating whether the output current exceeds the threshold value. The hard clipping unit receives the binary signal and ramps down the clip level during time periods in which the binary signal indicates that the output current exceeds the threshold. When the binary signal indicates that the output current does not exceed the threshold value, the hard clipping unit ramps up the clip level.

4. 发明申请

US20070152750A1 Digital PWM amplifier with simulation-based feedback 有权
标题翻译：数字PWM放大器，具有基于仿真的反馈
公开(公告)号：US20070152750A1
公开(公告)日：2007-07-05
申请号：US11324132
申请日：2005-12-30
申请人： Jack Andersen , Peter Craven , Michael Kost , Daniel Chieng , Larry Hand , Wilson Taylor
发明人： Jack Andersen , Peter Craven , Michael Kost , Daniel Chieng , Larry Hand , Wilson Taylor
IPC分类号： H03G3/20
CPC分类号： H03F3/217 , H03F1/32 , H03F2200/331
摘要： Systems and methods for performance improvements in digital switching amplifiers using simulation-based feedback. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a simulator configured to model processing of audio signals by the plant. The outputs of the plant and the simulator are provided to a subtractor, the output of which is then added to the input audio signal as feedback. The plant may consist of a modulator and power switch, a noise shaper, or any other type of plant. An analog-to-digital converter (ADC) may be provided to convert the output audio signal to a digital signal for input to the subtractor. Filtering may be implemented before or after the ADC, and a decimator may be placed after the ADC if it is an oversampling ADC.
摘要翻译：使用基于仿真的反馈数字开关放大器性能改进的系统和方法。在一个实施例中，数字脉宽调制（PWM）放大器包括被配置为接收和处理输入音频信号的信号处理设备。该放大器还包括一个模拟器，被配置为模拟工厂对音频信号的处理。工厂和模拟器的输出被提供给减法器，然后将其输出作为反馈加到输入音频信号上。该设备可以由调制器和电源开关，噪声整形器或任何其它类型的设备组成。可以提供模数转换器（ADC）以将输出音频信号转换为数字信号以输入到减法器。可以在ADC之前或之后实现滤波，如果ADC是过采样ADC，则可以在ADC之后放置抽取器。

5. 发明申请

US20070164885A1 Systems and methods for controlling transient response in the output of a noise shaper 有权
标题翻译：用于控制噪声整形器输出中的瞬态响应的系统和方法
公开(公告)号：US20070164885A1
公开(公告)日：2007-07-19
申请号：US11333709
申请日：2006-01-17
申请人： Jack Andersen
发明人： Jack Andersen
IPC分类号： H03M3/00
CPC分类号： H03M7/3011 , H03M7/3026
摘要： Systems and methods implemented in a multi-bit digital noise shaper for reducing or eliminating undesirable transient response when the noise shaper exits a clipping state. In one embodiment, the noise shaper includes a quantizer, a filter, and a filter control unit that detects clipping in the quantizer and dynamically adjusts the allowable range of the internal state values of the filter. In one embodiment, a clipping mechanism is provided for each state value within the filter to clip the state value if it exceeds a corresponding clipping level. The clipping level for each state value is lower when the quantizer is clipping, and higher when the quantizer is not clipping. The clipping level for each state value may be transitioned either immediately or gradually from a current level to a target level (which is lower when the quantizer is clipping, and higher when the quantizer is not clipping.)
摘要翻译：在多位数字噪声整形器中实现的系统和方法，用于在噪声整形器退出限幅状态时减少或消除不期望的瞬态响应。在一个实施例中，噪声整形器包括量化器，滤波器和滤波器控制单元，其检测量化器中的限幅并动态地调整滤波器的内部状态值的允许范围。在一个实施例中，为过滤器内的每个状态值提供限幅机构，以在状态值超过相应的限幅电平时剪切状态值。当量化器被削波时，每个状态值的限幅电平较低，而当量化器未被削波时，该限幅电平较高。每个状态值的削波电平可以立即或从当前电平逐渐转换到目标电平（当量化器被削波时其较低，而当量化器未被削波时更高）。

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