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1.发明申请公开(公告)号：US20190215031A1
公开(公告)日：2019-07-11
申请号：US16240037
申请日：2019-01-04
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Kok-Wui Cheong , Zhenzhong Gu
Abstract: Embodiments described herein provide echo cancellation power saving management at a cable transceiver. An echo response signal having a first number of signal components is obtained, via an echo cancellation filter. At a first iteration for calculating a first accumulative echo power, a respective echo tap that corresponds to the first iteration is identified. The first accumulative echo power is calculated for the respective iteration by summing powers of outputs from a last echo tap to the respective echo tap. It is then determined whether the first accumulative echo power, exceeds a pre-determined echo power threshold. If the first accumulative echo power exceeds the pre-determined echo power threshold, a first turn-off indication is sent to the echo cancellation filter to turn off all echo taps including and between the last echo tap to the first echo tap.
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公开(公告)号：US20180152326A1
公开(公告)日：2018-05-31
申请号：US15878334
申请日：2018-01-23
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Zhenzhong Gu , Kok-Wui Cheong
IPC: H04L25/03 , H04B3/23 , H04B17/309 , H04B3/493
CPC classification number: H04L25/03057 , H04B3/23 , H04B3/235 , H04B3/237 , H04B3/493 , H04B17/309 , H04L25/03146 , H04L25/03885 , H04L2025/03802
Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes a processor and an interface to transmit signals and receive signals via a channel that includes a cable. The processor can be configured to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals, signal equalization based on equalizer tap values, or both. The processor can be configured to determine a channel quality indicator of the channel based on one or more of the echo tap values, one or more of the equalizer tap values, or both. The processor can be configured to generate a warning indication based on the channel quality indicator indicating a degradation of the cable or the channel.
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3.发明授权Systems and methods for estimating an output current of a power conversion circuit 有权用于估计功率转换电路的输出电流的系统和方法公开(公告)号：US09552005B2
公开(公告)日：2017-01-24
申请号：US14299619
申请日：2014-06-09
Applicant: Marvell World Trade Ltd.
Inventor： Wanfeng Zhang , Jianqing Lin , Shaoan Dai
CPC classification number: G05F1/565 , H02M3/156 , H02M2001/0009 , H05B33/0815 , Y02B20/346
Abstract: A controller for a power conversion circuit that includes an inductor, a diode, and a switch. The controller includes a counter configured to determine, based on a first voltage input to the inductor, an on-time of the diode. The on-time of the diode corresponds to an amount of time that the diode is conducting a first current to a load of the power conversion circuit. A current estimation circuit configured to estimate, based on the on-time of the diode and an on-time of the switch, an output current of the power conversion circuit. The on-time of the switch corresponds to an amount of time that the switch is conducting a second current. A pulse width modulator is configured to provide, based on the estimated output current, a gate drive signal to the switch. The gate drive signal selectively transitions the switch between an on state and an off state.
Abstract translation: 一种用于包括电感器，二极管和开关的功率转换电路的控制器。 该控制器包括一个配置成基于输入到电感器的第一电压来确定二极管导通时间的计数器。 二极管的导通时间对应于二极管对电力转换电路的负载进行第一电流的时间量。 电流估计电路，被配置为基于二极管的接通时间和开关的接通时间来估计功率转换电路的输出电流。 开关的导通时间对应于开关正在进行第二电流的时间量。 脉冲宽度调制器被配置为基于估计的输出电流提供到开关的栅极驱动信号。 栅极驱动信号选择性地在导通状态和断开状态之间转换开关。
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4.发明授权公开(公告)号：US10190862B2
公开(公告)日：2019-01-29
申请号：US15470655
申请日：2017-03-27
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Kok-Wui Cheong , Zhenzhong Gu
Abstract: The systems include a transmitter, a receiver, a signal sampler and a cable length calculation unit. The transmitter is configured to transmit a plurality of data symbols at a first data rate via a wired data communication link, and the receiver is configured to receive a reflection signal. The signal sampler is configured to sample the received reflection signal using a phase shift number of shifting sampling phases to generate reflection samples, and combine the reflection samples with different sampling phases to generate a series of reflection samples corresponding to a second data rate higher than the first data rate. The cable length calculation unit is configured to determine a delay parameter from the series of reflection samples, and generate an estimate of a length of the data communication link.
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公开(公告)号：US10177810B2
公开(公告)日：2019-01-08
申请号：US15664621
申请日：2017-07-31
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Kok-Wui Cheong , Zhenzhong Gu
Abstract: Embodiments described herein provide echo cancellation power saving management at a cable transceiver. An echo response signal having a first number of signal components is obtained, via an echo cancellation filter. At a first iteration for calculating a first accumulative echo power, a respective echo tap that corresponds to the first iteration is identified. The first accumulative echo power is calculated for the respective iteration by summing powers of outputs from a last echo tap to the respective echo tap. It is then determined whether the first accumulative echo power, exceeds a pre-determined echo power threshold. If the first accumulative echo power exceeds the pre-determined echo power threshold, a first turn-off indication is sent to the echo cancellation filter to turn off all echo taps including and between the last echo tap to the first echo tap.
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Patent Agency Ranking
公开(公告)号：US20170180161A1
公开(公告)日：2017-06-22
申请号：US15380965
申请日：2016-12-15
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Zhenzhong Gu , Kok-Wui Cheong
CPC classification number: H04L25/03057 , H04B3/23 , H04B3/235 , H04B3/237 , H04B3/493 , H04B17/309 , H04L25/03146 , H04L25/03885 , H04L2025/03802
Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes an interface to transmit signals and receive signals via a channel that includes a cable; an echo canceller coupled with the interface, the echo canceller to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals; an equalizer coupled with the interface, the equalizer to perform signal equalization based on equalizer tap values, the equalizer tap values being determined based on at least a portion of the received signals to adjust an impulse response of the channel and reduce inter-symbol interference within the received signals; and circuitry configured to determine a return loss channel quality indicator of the channel based on the echo tap values, determine an insertion loss channel quality indicator of the channel based on the equalizer tap values, or both.
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公开(公告)号：US10177943B2
公开(公告)日：2019-01-08
申请号：US15878334
申请日：2018-01-23
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Zhenzhong Gu , Kok-Wui Cheong
IPC: H04L25/03 , H04B3/493 , H04B3/23 , H04B17/309
Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes a processor and an interface to transmit signals and receive signals via a channel that includes a cable. The processor can be configured to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals, signal equalization based on equalizer tap values, or both. The processor can be configured to determine a channel quality indicator of the channel based on one or more of the echo tap values, one or more of the equalizer tap values, or both. The processor can be configured to generate a warning indication based on the channel quality indicator indicating a degradation of the cable or the channel.
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8.发明申请公开(公告)号：US20180069595A1
公开(公告)日：2018-03-08
申请号：US15664621
申请日：2017-07-31
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Kok-Wui Cheong , Zhenzhong Gu
Abstract: Embodiments described herein provide echo cancellation power saving management at a cable transceiver. An echo response signal having a first number of signal components is obtained, via an echo cancellation filter. At a first iteration for calculating a first accumulative echo power, a respective echo tap that corresponds to the first iteration is identified. The first accumulative echo power is calculated for the respective iteration by summing powers of outputs from a last echo tap to the respective echo tap. It is then determined whether the first accumulative echo power, exceeds a pre-determined echo power threshold. If the first accumulative echo power exceeds the pre-determined echo power threshold, a first turn-off indication is sent to the echo cancellation filter to turn off all echo taps including and between the last echo tap to the first echo tap.
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公开(公告)号：US09882747B2
公开(公告)日：2018-01-30
申请号：US15380965
申请日：2016-12-15
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Zhenzhong Gu , Kok-Wui Cheong
IPC: H03H7/40 , H04L25/03 , H04B3/493 , H04B3/23 , H04B17/309
CPC classification number: H04L25/03057 , H04B3/23 , H04B3/235 , H04B3/237 , H04B3/493 , H04B17/309 , H04L25/03146 , H04L25/03885 , H04L2025/03802
Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes an interface to transmit signals and receive signals via a channel that includes a cable; an echo canceller coupled with the interface, the echo canceller to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals; an equalizer coupled with the interface, the equalizer to perform signal equalization based on equalizer tap values, the equalizer tap values being determined based on at least a portion of the received signals to adjust an impulse response of the channel and reduce inter-symbol interference within the received signals; and circuitry configured to determine a return loss channel quality indicator of the channel based on the echo tap values, determine an insertion loss channel quality indicator of the channel based on the equalizer tap values, or both.
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10.发明申请公开(公告)号：US20170276469A1
公开(公告)日：2017-09-28
申请号：US15470655
申请日：2017-03-27
Applicant: Marvell World Trade Ltd.
Inventor： Shaoan Dai , Kok-Wui Cheong , Zhenzhong Gu
CPC classification number: G01B7/026 , G01B7/02 , G01R31/006 , G01R31/2832
Abstract: Embodiments described herein provide a system for cable length measurement in a communication system. The system includes a transmitter, a receiver, a signal sampler and a cable length calculation unit. The transmitter is configured to transmit a plurality of data symbols at a first data rate via a wired data communication link, and the receiver is configured to receive a reflection signal. The signal sampler is configured to sample the received reflection signal using a phase shift number of shifting sampling phases to generate reflection samples, and combine the reflection samples with different sampling phases to generate a series of reflection samples corresponding to a second data rate higher than the first data rate. The cable length calculation unit is configured to determine a delay parameter from the series of reflection samples, and generate an estimate of a length of the data communication link.
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