Adaptive optimum CDR bandwidth estimation by using a kalman gain extractor
    15.
    发明授权
    Adaptive optimum CDR bandwidth estimation by using a kalman gain extractor 有权
    通过使用卡尔曼增益提取器自适应优化CDR带宽估计

    公开(公告)号:US08938043B2

    公开(公告)日:2015-01-20

    申请号:US13833321

    申请日:2013-03-15

    CPC classification number: H04L7/007 H04L7/0331

    Abstract: Exemplary embodiments of the present invention relate to a clock and data recovery (CDR) apparatus with adaptive optimum CDR bandwidth estimation by using a Kalman gain extractor. The Kalman gain extractor includes an off chip digital processor which receives a phase update information from the CDR outputs an estimated optimum Kalman gain obtained by extracting the standard deviation of step sizes of the accumulation jitter from the power spectral density (PSD) of the phase update information, and a on chip digital loop filter consists of a cyclic accumulator which accumulates the phase detector's output, a gain multiplier and a phase interpolator (or DCO) controller. The off chip digital processor includes a storage register, a fast Fourier transform (FFT) processor and an optimum Kalman gain estimator. The storage register stores the phase update information, from which the FFT processor extracts the PSD of the absolute input jitter. The optimum Kalman gain estimator calculates the optimum gain from the PSD of the accumulation jitter. The off chip digital processor may further include a gain calibrator to compensate for the variations in the transition density.

    Abstract translation: 本发明的示例性实施例涉及通过使用卡尔曼增益提取器具有自适应最佳CDR带宽估计的时钟和数据恢复(CDR)装置。 卡尔曼增益提取器包括离线数字处理器,其接收来自CDR的相位更新信息,输出通过从相位更新的功率谱密度(PSD)提取积累抖动的步长的标准偏差而获得的估计的最佳卡尔曼增益 信息和片上数字环路滤波器由积累相位检测器输出的循环累加器,增益乘法器和相位内插器(或DCO)控制器组成。 片外数字处理器包括存储寄存器,快速傅里叶变换(FFT)处理器和最佳卡尔曼增益估计器。 存储寄存器存储相位更新信息,FFT处理器从该存储器提取绝对输入抖动的PSD。 最佳卡尔曼增益估计器从累积抖动的PSD计算最佳增益。 片外数字处理器还可以包括增益校准器,以补偿转换密度的变化。

    ADAPTIVE OPTIMUM CDR BANDWIDTH ESTIMATION BY USING A KALMAN GAIN EXTRACTOR
    16.
    发明申请
    ADAPTIVE OPTIMUM CDR BANDWIDTH ESTIMATION BY USING A KALMAN GAIN EXTRACTOR 有权
    使用卡曼增益提取器的自适应最佳CDR带宽估计

    公开(公告)号:US20130259178A1

    公开(公告)日:2013-10-03

    申请号:US13833321

    申请日:2013-03-15

    CPC classification number: H04L7/007 H04L7/0331

    Abstract: Exemplary embodiments of the present invention relate to a clock and data recovery (CDR) apparatus with adaptive optimum CDR bandwidth estimation by using a Kalman gain extractor. The Kalman gain extractor includes an off chip digital processor which receives a phase update information from the CDR outputs an estimated optimum Kalman gain obtained by extracting the standard deviation of step sizes of the accumulation jitter from the power spectral density (PSD) of the phase update information, and a on chip digital loop filter consists of a cyclic accumulator which accumulates the phase detector's output, a gain multiplier and a phase interpolator (or DCO) controller. The off chip digital processor includes a storage register, a fast Fourier transform (FFT) processor and an optimum Kalman gain estimator. The storage register stores the phase update information, from which the FFT processor extracts the PSD of the absolute input jitter. The optimum Kalman gain estimator calculates the optimum gain from the PSD of the accumulation jitter. The off chip digital processor may further include a gain calibrator to compensate for the variations in the transition density.

    Abstract translation: 本发明的示例性实施例涉及通过使用卡尔曼增益提取器具有自适应最佳CDR带宽估计的时钟和数据恢复(CDR)装置。 卡尔曼增益提取器包括离线数字处理器,其接收来自CDR的相位更新信息,输出通过从相位更新的功率谱密度(PSD)提取积累抖动的步长的标准偏差而获得的估计的最佳卡尔曼增益 信息和片上数字环路滤波器由积累相位检测器输出的循环累加器,增益乘法器和相位内插器(或DCO)控制器组成。 片外数字处理器包括存储寄存器,快速傅里叶变换(FFT)处理器和最佳卡尔曼增益估计器。 存储寄存器存储相位更新信息,FFT处理器从该存储器提取绝对输入抖动的PSD。 最佳卡尔曼增益估计器从累积抖动的PSD计算最佳增益。 片外数字处理器还可以包括增益校准器,以补偿转换密度的变化。

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