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    Method and apparatus for oversampled, noise-shaping, mixed-signal processing
    4.
    发明授权
    Method and apparatus for oversampled, noise-shaping, mixed-signal processing 失效
    用于过采样，噪声整形，混合信号处理的方法和装置

    公开(公告)号：US5777512A

    公开(公告)日：1998-07-07

    申请号：US667925

    申请日：1996-06-20

    申请人： Adya S. Tripathi ,  Cary L. Delano

    发明人： Adya S. Tripathi ,  Cary L. Delano

    IPC分类号： H03F1/38 ,  H03F1/34 ,  H03F3/217 ,  H03M3/02

    CPC分类号： H03F3/217 ,  H03M3/344 ,  H03F2200/331 ,  H03M3/358 ,  H03M3/43 ,  H03M3/438

    摘要： A signal processing circuit is provided which includes a frequency selective network in a feedback loop for noise shaping purposes. A sampling analog-to-digital converter in the feedback loop operates at a sample frequency substantially above the Nyquist frequency. A switching device is driven by the sampling analog-to-digital converter and produces a continuous-time output signal which is continuously monitored by and fed back to the frequency selective network for noise and distortion correction in the feedback loop. This is in contrast to traditional techniques which employ only state feedback. State feedback (i.e., digital or sampled) of the output of the analog-to-digital converter may also be employed in combination with the continuous-time feedback of the switching device output.

    摘要翻译： 提供了一种信号处理电路，其包括用于噪声整形目的的反馈回路中的频率选择网络。 反馈回路中的采样模数转换器以基本上高于奈奎斯特频率的采样频率工作。 开关器件由采样模数转换器驱动，并产生连续监测和反馈给频率选择网络的连续时间输出信号，用于反馈回路中的噪声和失真校正。 这与仅采用状态反馈的传统技术形成对比。 模数转换器的输出的状态反馈（即，数字或采样）也可以与开关器件输出的连续时间反馈结合使用。

    Method and apparatus for performance improvement by qualifying pulses in an oversampled noise-shaping signal processor
    6.
    发明授权
    Method and apparatus for performance improvement by qualifying pulses in an oversampled noise-shaping signal processor 失效
    用于通过过采样噪声整形信号处理器中的限定脉冲来提高性能的方法和装置

    公开(公告)号：US5974089A

    公开(公告)日：1999-10-26

    申请号：US898544

    申请日：1997-07-22

    申请人： Adya S. Tripathi ,  Cary L. Delano

    发明人： Adya S. Tripathi ,  Cary L. Delano

    IPC分类号： H03M3/02 ,  H04B14/06

    CPC分类号： H04B14/06 ,  H03M3/376 ,  H03M3/43 ,  H03M3/454

    摘要： The transition time of power switching devices ultimately limits the rate at which such devices can be switched. Because the occurrence of unacceptably narrow pulses is relatively rare in an oversampled, noise-shaping signal processor, the elimination of such narrow pulses is introduced through the use of circuitry in the modulator loop which constrains the time between transitions to be greater than or equal to some minimum time period which, in turn provides for a smooth interface to power switching devices. However, because of the delay introduced by this pulse qualification circuitry, the modulator loop sampling frequency is increased to deal with any resulting instability. Thus, an oversampled, noise shaping signal processor is described having at least one integrator stage in a feedback loop. A sampling stage in the feedback loop is coupled to the at least one integrator stage. The sampling stage samples an analog signal at a sample frequency. Qualification logic coupled to the sampling stage receives a pulse waveform therefrom, and ensures that signal transitions in the pulse waveform occur more than a first time period apart and that the waveform can therefore be handled by, for example, a power switching device. A switching stage in the feedback loop is coupled to the qualification logic. The signal processor has a feedback path from the output of the switching stage to the input of the at least one integrator stage thereby closing the feedback loop.

    摘要翻译： 功率开关器件的转换时间最终限制了这种器件可以切换的速率。 因为在过采样的噪声整形信号处理器中出现不可接受的窄脉冲是相对较少的，所以通过使用调制器环路中的电路来引入这种窄脉冲的消除，这将限制转换之间的时间大于或等于 一些最小时间段，这反过来又提供了一个平滑的接口给电源开关设备。 然而，由于由该脉冲鉴定电路引入的延迟，调制器环路采样频率被增加以处理任何导致的不稳定性。 因此，描述过采样的噪声整形信号处理器在反馈回路中具有至少一个积分器级。 反馈回路中的采样级耦合到至少一个积分器级。 采样级以采样频率采样模拟信号。 耦合到采样级的限定逻辑从其接收脉冲波形，并且确保脉冲波形中的信号转换比第一时间间隔多出，并且波形因此可以由例如功率开关器件来处理。 反馈回路中的开关级耦合到限定逻辑。 信号处理器具有从开关级的输出到至少一个积分器级的输入的反馈路径，从而闭合反馈回路。

    Method and apparatus for compensating for delays in modulator loops
    7.
    发明授权
    Method and apparatus for compensating for delays in modulator loops 失效
    用于补偿调制器环路延迟的方法和装置

    公开(公告)号：US5909153A

    公开(公告)日：1999-06-01

    申请号：US19217

    申请日：1998-02-05

    申请人： Cary L. Delano ,  Adya S. Tripathi

    发明人： Cary L. Delano ,  Adya S. Tripathi

    IPC分类号： H03K7/08 ,  H03C1/06 ,  H03F3/217 ,  H04B1/04 ,  H03C3/08 ,  H03F3/38

    CPC分类号： H03F3/217 ,  H03C1/06 ,  H03K7/08 ,  H03M3/37 ,  H03M3/432

    摘要： A modulator loop designed to operate in a frequency range of interest is described. The loop includes a loop output terminal and a switching stage, the output of which is coupled to the loop output terminal. The switching stage has a first delay associated therewith. The output of a modulator stage is coupled to the input of the switching stage. A first feedback path is coupled between the loop output terminal and the feedback input of the modulator stage. A feedback filter is coupled between the output of the modulator stage and the feedback input of the modulator stage which compensates for the first delay. The feedback filter is operable to transmit frequencies outside the frequency range of interest and attenuate frequencies in the frequency range of interest.

    摘要翻译： 描述了设计成在感兴趣的频率范围内工作的调制器环路。 环路包括环路输出端子和开关级，其输出端耦合到环路输出端子。 开关级具有与之相关联的第一延迟。 调制器级的输出耦合到开关级的输入端。 第一反馈路径耦合在环路输出端子和调制器级的反馈输入端之间。 反馈滤波器耦合在调制器级的输出和补偿第一延迟的调制器级的反馈输入之间。 反馈滤波器可操作以在感兴趣的频率范围之外传输频率，并在感兴趣的频率范围内衰减频率。

    REDUCED CURRENT CHARGE PUMP
    8.
    发明申请
    REDUCED CURRENT CHARGE PUMP 有权
    减少电流充电泵

    公开(公告)号：US20110148510A1

    公开(公告)日：2011-06-23

    申请号：US12644697

    申请日：2009-12-22

    申请人： Timothy Alan Dhuyvetter ,  Brian Ben North ,  Cary L. Delano

    发明人： Timothy Alan Dhuyvetter ,  Brian Ben North ,  Cary L. Delano

    IPC分类号： G05F1/10

    CPC分类号： H02M3/07 ,  H02M2001/0032 ,  Y02B70/16

    摘要： This document discusses, among other things, a charge pump having a plurality of switching devices, coupled in parallel, and configured to selectively provide a variable available drive current for a capacitor using a comparison of an output voltage to at least one reference voltage.

    摘要翻译： 该文件尤其涉及具有并联耦合的多个开关器件的电荷泵，并且被配置为通过将输出电压与至少一个参考电压进行比较来选择性地为电容器提供可变的可用驱动电流。

    ACTIVE NOISE CANCELLATION
    9.
    发明申请
    ACTIVE NOISE CANCELLATION 有权
    主动噪声消除

    公开(公告)号：US20110129098A1

    公开(公告)日：2011-06-02

    申请号：US12913897

    申请日：2010-10-28

    申请人： Cary L. Delano ,  Steven M. Waldstein

    发明人： Cary L. Delano ,  Steven M. Waldstein

    IPC分类号： G10K11/16

    CPC分类号： G10L21/0216 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/111 ,  G10L2021/02161

    摘要： This document discusses, among other things, systems and methods for active noise cancellation. One example system includes a digital ANC circuit configured to receive first audio information from a first microphone and to produce an a digital anti-noise signal configured to attenuate noise sensed by the first microphone; an analog ANC circuit configured to receive second audio information from a second microphone and to produce an analog anti-noise signal configured to attenuate noise sensed by the second microphone; and wherein the system is configured to receive an intended audio signal and to provide an output signal for a speaker using the intended audio signal, the analog anti-noise signal, and the digital anti-noise signal.

    摘要翻译： 本文件还讨论了主动噪声消除的系统和方法。 一个示例性系统包括数字ANC电路，其被配置为从第一麦克风接收第一音频信息并产生被配置为衰减由第一麦克风感测的噪声的数字抗噪声信号; 模拟ANC电路被配置为从第二麦克风接收第二音频信息并产生被配置为衰减由第二麦克风感测的噪声的模拟抗噪声信号; 并且其中所述系统被配置为接收预期音频信号并且使用所述预期音频信号，所述模拟抗噪声信号和所述数字抗噪声信号为扬声器提供输出信号。

    CLASS L AMPLIFIER
    10.
    发明申请
    CLASS L AMPLIFIER 有权
    CLASS L放大器

    公开(公告)号：US20080315955A1

    公开(公告)日：2008-12-25

    申请号：US12200794

    申请日：2008-08-28

    申请人： Cary L. Delano

    发明人： Cary L. Delano

    IPC分类号： H03F1/02

    CPC分类号： H03F1/0244 ,  H03F3/3081 ,  H03F2200/516

    摘要： A new Class L amplifier which dynamically switches between multiple pairs of power rails, and has the ability to select the most advantageous combination of rails for the minimization of power dissipation in the amplifier. In one embodiment, a bridged amplifier system includes two Class L amplifiers to drive a load.

    摘要翻译： 一种新的L类放大器，可在多对电源轨之间动态切换，并且能够选择最有利的轨道组合，以最大限度地减少放大器的功耗。 在一个实施例中，桥接放大器系统包括用于驱动负载的两个L类放大器。