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41.发明授权Delta-sigma modulators with double sampling input networks and systems using the same 有权具有双采样输入网络的Delta-Σ调制器和使用它们的系统公开(公告)号：US07167119B1
公开(公告)日：2007-01-23
申请号：US11312882
申请日：2005-12-20
IPC分类号： H03M3/00
摘要： A method of sampling an input signal in a delta-sigma modulator having at least an integrator stage and a feedback digital-to-analog converter (DAC) stage includes sampling an input signal at a sampling rate by alternately utilizing the two sampling capacitors during two sampling cycles such that the two sampling capacitors are each being utilized at half the rate of the sampling rate. Samples from the two sampling capacitors are summed at the sampling rate at an intermediate node with a feedback samples provided by the feedback DAC stage at the sampling rate to generate output samples which are output from integrator stage at the sampling rate.
摘要翻译： 在至少具有积分器级和反馈数模转换器（DAC）级的Δ-Σ调制器中对输入信号进行采样的方法包括以两个采样电容器在两个采样电容器期间交替地利用采样率对输入信号进行采样 采样周期使得两个采样电容器分别以采样率的一半的速率被使用。 来自两个采样电容器的样本以中间节点处的采样率相加，其中反馈DAC级以采样率提供反馈样本，以产生以采样率从积分器级输出的输出采样。
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42.发明授权Circuits and methods for controlling switching noise in switched-mode circuits 有权用于控制开关电路中开关噪声的电路和方法公开(公告)号：US07142819B1
公开(公告)日：2006-11-28
申请号：US11233961
申请日：2005-09-23
IPC分类号： H04B1/00
CPC分类号： H04B15/04 , H03F3/2173 , H04B2215/065 , H04B2215/069
摘要： A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the sample frequency represents a level within the range of information levels, to shift in frequency noise generated at the sample frequency during encoding of the data sample stream into pulse width modulated patterns.
摘要翻译： 一种控制脉冲宽度调制电路中的噪声的方法包括改变采样频率和信号电平范围，其中采样频率下数据采样流内的每个采样信号表示信号电平范围内的电平，以使频率噪声偏移 在将数据采样流编码成脉冲宽度调制图案期间以采样频率生成。
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公开(公告)号：US07110460B1
公开(公告)日：2006-09-19
申请号：US10914917
申请日：2004-08-10
申请人： John Laurence Melanson , Heling Yi
发明人： John Laurence Melanson , Heling Yi
CPC分类号： H03M7/304 , H03M7/3026 , H03M7/3028
摘要： A delta-sigma modulator of an order of at least three having a signal transfer function defining a signal low-pass response, the signal transfer function has a numerator and a denominator, the denominator defined by a product of first and second functions defining respective first and second pole sets such that a roll-off frequency of a low-pass response defined by the first pole set is at least twice a roll-off frequency of a low-pass response defined by the second pole set. The delta-sigma modulator also has a noise transfer function defining a noise high-pass response, the noise transfer function having a numerator and a denominator, the denominator defined by the product of the first and second functions. The numerator of the noise transfer function differs from the numerator of the signal transfer function and characterizes the noise high-pass response.
摘要翻译： 具有定义信号低通响应的信号传递函数的具有至少三个数量级的Δ-Σ调制器，所述信号传递函数具有分子和分母，所述分母由第一和第二函数的乘积定义，所述第一和第二函数定义相应的第一 以及第二极点组，使得由第一极点集限定的低通响应的滚降频率为由第二极点限定的低通响应的滚降频率的至少两倍。 Δ-Σ调制器还具有定义噪声高通响应的噪声传递函数，噪声传递函数具有分子和分母，分母由第一和第二函数的乘积定义。 噪声传递函数的分子与信号传递函数的分子不同，并表征噪声高通响应。
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公开(公告)号：US06933871B2
公开(公告)日：2005-08-23
申请号：US10379742
申请日：2003-03-05
CPC分类号： H03M7/3006 , H03M7/3011 , H03M7/3026 , H03M7/3033 , H03M7/3037
摘要： A digital to analog converter including an input for receiving an input signal, a ramp generator, and a delta-sigma modulator responsive to the input signal and an output of the ramp generator. An order of a noise shaping transfer function of the delta-sigma modulator is response to a level of the output of the ramp generator.
摘要翻译： 数模转换器，包括用于接收输入信号的输入端，斜坡发生器和响应于输入信号和斜坡发生器输出的Δ-Σ调制器。 Δ-Σ调制器的噪声整形传递函数的顺序响应于斜坡发生器的输出电平。
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45.发明授权Delta-sigma amplifiers with output stage supply voltage variation compensation and methods and digital amplifier systems using the same 有权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
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。
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46.发明授权Noise shaping circuits and methods with feedback steering overload compensation and systems using the same 有权噪声整形电路和方法具有反馈转向过载补偿和使用相同的系统公开(公告)号：US06724332B1
公开(公告)日：2004-04-20
申请号：US10217368
申请日：2002-08-13
IPC分类号： H03M300
CPC分类号： H03M7/3011 , H03M7/3026 , H03M7/3033
摘要： A noise shaper includes a first feedback loop for noise shaping a first feedback signal under normal operating conditions and having a first filter with a first signal transfer function and a second feedback loop that is stable under overload conditions and has a second filter having a second signal transfer function differing from the first signal transfer function. The noise shaper also includes an output circuit block including a quantizer and steering circuitry. The quantizer includes an input simultaneously responsive to outputs of the first and second filters. The steering circuitry steers a feedback from an output of the quantizer to input of the first and second feedback loops. The steering circuitry steers feedback from output of the quantizer to inputs of the first and second feedback loops, the steering circuitry including a first output for providing the first feedback signal to the first feedback loop and a second output for providing a second feedback signal to the second feedback loop.
摘要翻译： 噪声整形器包括用于在正常操作条件下对第一反馈信号进行噪声整形并且具有第一信号传递函数的第一滤波器和在过载条件下稳定的第二反馈环路的第一反馈环路，并且具有第二滤波器，该第二滤波器具有第二信号 传递函数不同于第一信号传递函数。 噪声整形器还包括包括量化器和转向电路的输出电路块。 量化器包括同时响应于第一和第二滤波器的输出的输入。 转向电路将来自量化器的输出的反馈引导到第一和第二反馈回路的输入。 转向电路将来自量化器的输出的反馈转换为第一和第二反馈回路的输入，转向电路包括用于向第一反馈回路提供第一反馈信号的第一输出和用于向第一反馈回路提供第二反馈信号的第二输出 第二反馈回路。
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公开(公告)号：US06593806B1
公开(公告)日：2003-07-15
申请号：US09927808
申请日：2001-08-10
IPC分类号： H03F338
CPC分类号： H03F3/217 , H03F1/3241 , H03F3/2178 , H03F2200/294 , H03F2200/331 , H03F2200/372
摘要： A system and method for compensating switched mode amplifiers. The amplifier system includes an adaptive filter coupled to the output of circuitry that recovers the analog signal from the output of the switching amplifier circuitry. The adaptive filter derives an inverse transfer function of the forward path through the system. The derived inverse transfer function is used to generate a coefficient map which a compensation filter responsively compensates for from variations in the output load of the amplifier system. In the disclosed method, the deriving the inverse transfer function may further include calibrating the adaptive filter continuously, at system startup or in response to user demand.
摘要翻译： 一种用于补偿开关模式放大器的系统和方法。 放大器系统包括耦合到电路输出的自适应滤波器，其从开关放大器电路的输出恢复模拟信号。 自适应滤波器导出通过系统的前向路径的反向传递函数。 导出的反向传递函数用于生成补偿滤波器响应于从放大器系统的输出负载的变化补偿的系数图。 在所公开的方法中，导出逆传递函数还可以包括在系统启动时或响应于用户需求连续校准自适应滤波器。
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48.发明授权Calibration and compensation of delta sigma ADC's and DAC's by correlating noise signals 有权通过相关噪声信号校准和补偿Δ-ΣADC和DAC公开(公告)号：US06449569B1
公开(公告)日：2002-09-10
申请号：US09457014
申请日：1999-12-08
IPC分类号： H03M110
摘要： The present invention correlates noise from a delta sigma modulator with noise from the same modulator passed through a nonlinear block whose purpose is to isolate the imperfection being measured. Once the imperfection is measured the results may be used to correct the output of the delta sigma modulator, to accept or reject chips or for other purposes.
摘要翻译： 本发明将来自ΔΣ调制器的噪声与来自同一调制器的噪声相关联，该噪声通过非线性块，其目的是隔离被测量的不完美。 一旦测量不完整，结果可用于校正delta-Σ调制器的输出，接受或拒绝芯片或用于其他目的。
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公开(公告)号：US06414614B1
公开(公告)日：2002-07-02
申请号：US09510035
申请日：2000-02-22
IPC分类号： H03M300
CPC分类号： H03F3/217 , H03F1/32 , H03F2200/351 , H03M3/358 , H03M3/506
摘要： Circuitry is provided to compensate for distortion introduced into the output signal of a delta sigma digital to analog converter (DAC) by the power output stage of the amplifier. Such distortion is not consistent for a given output data value or short series of data values, but must be either measured and corrected in real time or must be corrected in real time based upon a sophisticated model of the system that predicts the distortion. Correction is applied to one or more feedback loops in the delta sigma converter. Distortion caused by fluctuations in the power supply voltage may also be modeled and corrected in real time.
摘要翻译： 提供电路以补偿由放大器的功率输出级引入到ΔΣ数模转换器（DAC）的输出信号中的失真。 对于给定的输出数据值或短系列数据值，这种失真不一致，但必须实时测量和校正，或者必须基于预测失真的系统的复杂模型实时校正。 校正被应用于Δ-Σ转换器中的一个或多个反馈回路。 电源电压波动引起的失真也可以实时建模和校正。
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公开(公告)号：US06344811B1
公开(公告)日：2002-02-05
申请号：US09526784
申请日：2000-03-16
IPC分类号： H03M300
CPC分类号： H03F1/3241 , H03F3/217 , H03F2200/331 , H03M3/354 , H03M3/388 , H03M3/506
摘要： The digital amplifier of the present invention comprises a delta sigma noise shaper feeding a pulse wave modulator (PWM) which drives a load such as a speaker. The amplifier includes circuitry to measure the voltage coming out of the power supply in the circuit, and using this measurement as a control signal to modify the feedback path and direct path of the noise shaper, in order to correct the pulse width output to compensate for the varying power supply voltages. The amplifier may also include circuitry to correct for the nonlinear effects of pulse wave modulation, by correcting the feedback applied to one stage of the noise shaper such that it is nontrivially different from the feedback applied to another stage.
摘要翻译： 本发明的数字放大器包括一个进给脉冲波调制器（PWM）的Δ-Σ噪声整形器，该脉冲波调制器（PWM）驱动诸如扬声器的负载。 放大器包括用于测量电路中电源的电压的电路，并且使用该测量作为控制信号来修改噪声整形器的反馈路径和直接路径，以便校正脉冲宽度输出以补偿 变化的电源电压。 放大器还可以包括校正脉冲波调制的非线性效应的电路，通过校正施加到噪声整形器的一个级的反馈，使得其与施加到另一级的反馈非常不同。
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