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公开(公告)号：US20180308466A1
公开(公告)日：2018-10-25
申请号：US15495746
申请日：2017-04-24
Inventor： Dayong Zhou , John L. Melanson
IPC: G10K11/178
Abstract: The overall performance of an ANC system may be improved by configuring the ANC system to perform adaption in the frequency domain. The ANC systems may be configured to update an algorithm of an adaptive filter based, at least in part, on the first input signal, the second input signal, and a feedback signal that is based on an output of the adaptive filter. Updating may include changing parameters of the algorithm based on a SDR based, at least in part, on the first input signal. Updating may also include normalizing a step size and processing at least full band information for the input signal in a frequency domain to generate coefficient values for the algorithm. Updating may also include applying a frequency domain magnitude constraint on adaptive filter coefficients.
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公开(公告)号：US20180212570A1
公开(公告)日：2018-07-26
申请号：US15581057
申请日：2017-04-28
Inventor： Lei Zhu , Xin Zhao , John L. Melanson
CPC classification number: H03F1/0233 , H03F1/30 , H03F1/3247 , H03F1/3264 , H03F1/56 , H03F3/183 , H03F3/187 , H03F3/217 , H03F3/2171 , H03F3/2175 , H03F2200/03 , H03F2200/351 , H03F2200/387 , H03F2200/391 , H03F2200/421 , H03F2200/459 , H03F2201/3233 , H03G3/3005 , H03G3/3089 , H03M1/66
Abstract: Resistor mismatch may be digitally compensated based on a known resistor mismatch, power supply information, and/or other operating parameters of the amplifier. The digital compensation may be applied to the digital input signal before conversion for processing and amplification in the analog domain. An amplifier with digital compensation for resistor mismatch may be used in a class-D amplifier with a closed loop and feedforward feedback. A class-D or other amplifier with digital compensation may be integrated with electronic devices such as mobile phones.
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公开(公告)号：US09906196B2
公开(公告)日：2018-02-27
申请号：US15270631
申请日：2016-09-20
Inventor： Zhaohui He , Eric J. King , Siddharth Maru , John L. Melanson
CPC classification number: H03F3/217 , H03F1/04 , H03F1/34 , H03F3/185 , H03F3/2171 , H03F3/2173 , H03F3/45475 , H03F2200/351 , H03F2200/432 , H03F2203/45034 , H04R3/12 , H04R2420/03
Abstract: A switching power stage for producing a load voltage may include a first processing path having a first output, a second processing path having a second output, a first plurality of switches comprising at least a first switch coupled between the first output and a first load terminal and a second switch coupled between the first output and the second load terminal, a second plurality of switches comprising at least a third switch coupled between the second output and the first load terminal and a fourth switch coupled between the second output and the second load terminal, and a controller configured to control switches in order to generate the load voltage as a function of an input signal such that one of the first switch and the second switch operates in a linear region of operation and one of the third switch and the fourth switch operates in a saturated region of operation for a predominance of a dynamic rage of the load voltage.
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公开(公告)号：US09812114B2
公开(公告)日：2017-11-07
申请号：US15058866
申请日：2016-03-02
Inventor： Jeffrey D. Alderson , Jon D. Hendrix , Sang-Ik Terry Cho , Chin Huang Yong , John L. Melanson
IPC: A61F11/06 , G10K11/16 , G10K11/178
CPC classification number: G10K11/178 , G10K11/17885 , G10K2210/108 , G10K2210/1081 , G10K2210/3014 , G10K2210/3016 , G10K2210/3028 , G10K2210/3056
Abstract: A method may include adaptively generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer by adapting a response of an adaptive filter that filters a reference microphone signal in conformity with an error microphone signal and the reference microphone signal to minimize the ambient audio sounds in the error microphone, generating a scaled anti-noise signal by applying a scaling factor to the anti-noise signal, further adjusting the response of the adaptive filter independent of a source audio signal by altering an input to the coefficient control block of the adaptive filter to compensate for the scaling factor, and combining the scaled anti-noise signal with the source audio signal to generate an audio signal provided to the transducer.
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25.发明申请公开(公告)号：US20170294512A1
公开(公告)日：2017-10-12
申请号：US15093574
申请日：2016-04-07
Inventor： Shanjen Pan , Marc L. Tarabbia , John L. Melanson
IPC: H01L29/10 , H01L29/66 , B81B3/00 , H01L29/808
CPC classification number: H01L29/1083 , B81B3/0027 , B81B2201/0257 , B81B2203/0127 , B81B2207/015 , H01L29/0649 , H01L29/0692 , H01L29/66901 , H01L29/808
Abstract: A JFET structure may be formed such that the channel region is isolated from the substrate to reduce parasitic capacitance. For example, instead of using a deep well as part of a gate structure for the JFET, the deep well may be used as an isolation region from the surrounding substrate. As a result, the channel in the JFET may be pinched laterally between doped regions located between the source and the drain of the JFET. In other example embodiments, the channel may be pinched vertically and the isolation between the JFET structure and the substrate is maintained. A JFET structure with improved isolation from the substrate may be employed in some embodiments as a low-noise amplifier. In particular, the low-noise amplifier may be coupled to small signal devices, such as microelectromechanical systems (MEMS)-based microphones.
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Patent Agency Ranking
公开(公告)号：US09729164B2
公开(公告)日：2017-08-08
申请号：US14826996
申请日：2015-08-14
Inventor： Ramin Zanbaghi , Yousof Mortazavi , Aaron Brennan , John L. Melanson
CPC classification number: H03M1/14 , G06F3/16 , G11C27/024 , H03F3/005 , H03F3/45475 , H03F3/45959 , H03F2203/45421 , H03F2203/45512 , H03F2203/45544 , H03F2203/45551 , H03M1/124 , H03M1/1295 , H03M3/458 , H03M3/494 , H03M3/496 , H04R3/00 , H04R19/04 , H04R29/004 , H04R2499/11
Abstract: One method of processing microphone input in an ADC to determine microphone configuration is to process the microphone input signals in two processing paths, in which one processing path processes a difference between differential input signals and another processing path processes an average value of the differential input signals. The outputs of these processing paths may be combined to generate a digital signal representative of the analog signal from the microphone. The digital signal contains a digital version of the audio in the environment around the microphone, but may also be used to detect microphone topology and configure aspects of the processing paths to match the detected microphone topology. An apparatus for an ADC may implement the two processing paths as two delta-sigma modulator loops.
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公开(公告)号：US20170163252A1
公开(公告)日：2017-06-08
申请号：US14962615
申请日：2015-12-08
Inventor： Vaibhav Pandey , John L. Melanson , Anindya Bhattacharya
IPC: H03K5/24 , H03K3/3565
CPC classification number: H03K5/2481 , H03K3/02337 , H03K3/3565
Abstract: In accordance with embodiments of the present disclosure, a comparator may include a transconductance stage having an input configured to receive an input voltage and generate an intermediate current responsive to the input voltage, a hysteretic current source configured to generate a hysteretic current, an output stage configured to generate an output signal based at least on the intermediate current, and a switch responsive to the output stage and configured to combine the intermediate current and the hysteretic current to generate a combined current, such that the output stage generates the output signal based at least on the intermediate current and the hysteretic current when output signal has a first value.
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28.发明授权公开(公告)号：US09660632B1
公开(公告)日：2017-05-23
申请号：US14971109
申请日：2015-12-16
Inventor： John L. Melanson , Paul Lesso
IPC: H03K7/08
CPC classification number: H03K3/011 , H03F1/303 , H03F3/2171 , H03K7/08 , H03M1/822
Abstract: Noise introduced in an output signal of a pulse-width modulator (PWM) may be reduced by changing the time duration that a switch is driving the output node. Because the power supplies coupled to the switches are the source of noise in the output signal of the PWM, the time duration that the power supplies are driving the output may be reduced to obtain a subsequent reduction in noise in the output signal. For example, when a small signal is desired to be output by the PWM, the switches may be operated for shorter time durations. Thus, the switches couple the noise sources to ground for a duration of a cycle to reduce contribution of noise to the output. But, when a larger signal is desired to be output by the PWM, the switches may be operated for longer time durations or the conventional time durations described above.
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公开(公告)号：US20170047939A1
公开(公告)日：2017-02-16
申请号：US15236163
申请日：2016-08-12
Inventor： Ramin Zanbaghi , Aaron Brennan , Daniel J. Allen , John L. Melanson
CPC classification number: H03M1/14 , G06F17/11 , G11C27/024 , H03F3/005 , H03F3/45475 , H03F3/45959 , H03F2203/45421 , H03F2203/45512 , H03F2203/45544 , H03F2203/45551 , H03M1/124 , H03M1/1295 , H03M3/458 , H03M3/496 , H04R3/00 , H04R19/04 , H04R29/004 , H04R2420/05 , H04R2499/11
Abstract: An analog-to-digital converter (ADC) may include capability to sense and/or compensate for undesired effects when receiving input from a microphone. For example, a sense node may be provided between differential inputs, and that sense node separated from the differential inputs by two or more switches. The sense node may allow for a measurement of an average voltage of the differential inputs. The average voltage may be obtained activating the switches to sample the sampling capacitors coupled to the differential inputs. That average voltage may be used as common mode (CM) data. A controller may receive the CM data, along with differential mode (DM) data, and use the CM and DM data to determine undesired effects, such as DC or AC mismatch at the microphone interface. The controller may then generate a signal for applying compensation to the differential inputs to reduce or eliminate the undesired effects.
Abstract translation: 模数转换器（ADC）可以包括当从麦克风接收输入时感测和/或补偿不期望的效果的能力。 例如，可以在差分输入之间提供感测节点，并且感测节点可以由两个或更多个开关与差分输入分离。 感测节点可以允许差分输入的平均电压的测量。 可以获得平均电压来激活开关以采样耦合到差分输入的采样电容器。 该平均电压可以用作共模（CM）数据。 控制器可以与差分模式（DM）数据一起接收CM数据，并使用CM和DM数据来确定不期望的效果，例如麦克风接口处的DC或AC失配。 然后，控制器可以生成用于向差分输入施加补偿的信号，以减少或消除不期望的影响。
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30.发明申请DUAL PROCESSING PATHS FOR DIFFERENTIAL MODE AND COMMON MODE SIGNALS FOR AN ADAPTABLE ANALOG-TO-DIGITAL CONVERTER (ADC) TOPOLOGY 有权用于适应模数转换器（ADC）拓扑学的差分模式和共模信号的双处理模式公开(公告)号：US20170047938A1
公开(公告)日：2017-02-16
申请号：US14826996
申请日：2015-08-14
Inventor： Ramin Zanbaghi , Yousof Mortazavi , Aaron Brennan , John L. Melanson
CPC classification number: H03M1/14 , G06F3/16 , G11C27/024 , H03F3/005 , H03F3/45475 , H03F3/45959 , H03F2203/45421 , H03F2203/45512 , H03F2203/45544 , H03F2203/45551 , H03M1/124 , H03M1/1295 , H03M3/458 , H03M3/494 , H03M3/496 , H04R3/00 , H04R19/04 , H04R29/004 , H04R2499/11
Abstract: One method of processing microphone input in an ADC to determine microphone configuration is to process the microphone input signals in two processing paths, in which one processing path processes a difference between differential input signals and another processing path processes an average value of the differential input signals. The outputs of these processing paths may be combined to generate a digital signal representative of the analog signal from the microphone. The digital signal contains a digital version of the audio in the environment around the microphone, but may also be used to detect microphone topology and configure aspects of the processing paths to match the detected microphone topology. An apparatus for an ADC may implement the two processing paths as two delta-sigma modulator loops.
Abstract translation: 在ADC中处理麦克风输入以确定麦克风配置的一种方法是在两个处理路径中处理麦克风输入信号，其中一个处理路径处理差分输入信号之间的差异和另一个处理路径处理差分输入信号的平均值 。 这些处理路径的输出可以被组合以产生表示来自麦克风的模拟信号的数字信号。 数字信号包含麦克风周围环境中的音频的数字版本，但也可用于检测麦克风拓扑并配置处理路径的各个方面以匹配检测到的麦克风拓扑结构。 用于ADC的装置可以将两个处理路径实现为两个Δ-Σ调制器环路。
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