公开(公告)号：US20130195154A1

公开(公告)日：2013-08-01

申请号：US13360978

申请日：2012-01-30

Applicant: Mohammad Mobin ,  Amaresh Malipatil ,  Adam Healey ,  Ye Liu

Inventor： Mohammad Mobin ,  Amaresh Malipatil ,  Adam Healey ,  Ye Liu

IPC: H04B1/38

CPC classification number: H04L12/6418

Abstract: A communication port and method of adapting a transmit filter in the port to reduce receive errors by a receiver coupled to the transmit filter via a communication channel. The filter has coefficients that are adjusted in response to a first adaptation gain value, decision bits, and receiver error values. During a first time period, the coefficients are adjusted until changes in the coefficients are less than a first threshold amount. Then during a second time period, the coefficients are adjusted using a second adaptation gain value until changes in the coefficients are less than a second threshold amount. The second adaptation gain value is less than the first adaptation gain value and the second threshold amount being less than the first threshold amount. By using two or more adjustment periods with different gain values, the filter is adapted faster than using a single adjustment period with fixed adaptation gain.

Abstract translation: 一种在端口中适配发射滤波器的通信端口和方法，用于通过通信信道减少接收器与发射滤波器的接收误差。 滤波器具有响应于第一自适应增益值，判定位和接收器误差值而被调整的系数。 在第一时间段期间，系数被调整直到系数的变化小于第一阈值量。 然后在第二时间段期间，使用第二自适应增益值来调整系数，直到系数的变化小于第二阈值量。 第二自适应增益值小于第一适应增益值，第二阈值量小于第一阈值量。 通过使用具有不同增益值的两个或更多个调整周期，滤波器比使用具有固定自适应增益的单个调整周期更适合。

公开(公告)号：US08379711B2

公开(公告)日：2013-02-19

申请号：US12495547

申请日：2009-06-30

Applicant: Pervez M. Aziz ,  Adam B. Healey ,  Amaresh Malipatil ,  Lizhi Zhong

Inventor： Pervez M. Aziz ,  Adam B. Healey ,  Amaresh Malipatil ,  Lizhi Zhong

IPC: H03H7/30

CPC classification number: H04L25/03057 ,  H04L25/14 ,  H04L2025/03503 ,  H04L2025/03535 ,  H04L2025/03617

Abstract: Methods and apparatus are provided for decision-feedback equalization with an oversampled phase detector. A method is provided for detecting data in a receiver employing decision-feedback equalization. A received signal is sampled using a data clock and a transition clock to generate a data sample signal and a transition sample signal. A DFE correction is obtained for each of the data sample and transition sample signals to generate DFE detected data and DFE transition data. One or more coefficients used for the DFE correction for the transition sample signals are adapted using the DFE transition data.

Abstract translation: 提供了使用过采样相位检测器进行判决反馈均衡的方法和装置。 提供一种用于使用判决反馈均衡来检测接收机中的数据的方法。 使用数据时钟和转换时钟对接收到的信号进行采样，以生成数据采样信号和转换采样信号。 为每个数据采样和转换采样信号获得DFE校正，以产生DFE检测数据和DFE转换数据。 用于转换采样信号的DFE校正的一个或多个系数使用DFE转换数据进行调整。

公开(公告)号：US08837626B2

公开(公告)日：2014-09-16

申请号：US13315831

申请日：2011-12-09

Applicant: Amaresh Malipatil ,  Pervez M. Aziz ,  Mohammad S. Mobin ,  Ye Liu

Inventor： Amaresh Malipatil ,  Pervez M. Aziz ,  Mohammad S. Mobin ,  Ye Liu

IPC: H04L27/01

CPC classification number: H04L25/03057 ,  H04L7/033 ,  H04L7/0331 ,  H04L25/0292 ,  H04L25/0307 ,  H04L25/03159 ,  H04L25/03885 ,  H04L2025/03636 ,  H04L2025/037

Abstract: Described embodiments adjust configurable parameters of at least one filter of a communication system. The method includes conditioning, by an analog front end (AFE) of a receiver in the communication system, an input signal applied to the receiver. Sampled values of the conditioned input signal are generated and digitized. An error detection module generates an error signal based on digitized values of the input signal and a target value. A decision feedback equalizer generates an adjustment signal based on the digitized values of the input signal and values of the error signal. A summer subtracts the adjustment signal from the conditioned input signal, generating an adjusted input signal. An adaptation module determines a conditional adaptation signal based on a comparison of sampled values of the adjusted input signal and values of the error signal. The adaptation module adjusts a transfer function of at least one filter based on the conditional adaptation signal.

Abstract translation: 描述的实施例调整通信系统的至少一个滤波器的可配置参数。 该方法包括通过通信系统中的接收机的模拟前端（AFE）调整施加到接收机的输入信号。 生成调节输入信号的采样值并进行数字化。 误差检测模块基于输入信号的数字化值和目标值产生误差信号。 判决反馈均衡器基于输入信号的数字化值和误差信号的值生成调整信号。 夏季从调节的输入信号中减去调整信号，产生经调整的输入信号。 适应模块基于经调整的输入信号的采样值和误差信号的值的比较来确定条件适配信号。 适应模块基于条件适应信号来调整至少一个滤波器的传递函数。

公开(公告)号：US08687682B2

公开(公告)日：2014-04-01

申请号：US13360978

申请日：2012-01-30

Applicant: Mohammad Mobin ,  Amaresh Malipatil ,  Adam Healey ,  Ye Liu

Inventor： Mohammad Mobin ,  Amaresh Malipatil ,  Adam Healey ,  Ye Liu

IPC: H03K5/159 ,  H04B1/10

CPC classification number: H04L12/6418

Abstract: A communication port and method of adapting a transmit filter in the port to reduce receive errors by a receiver coupled to the transmit filter via a communication channel. The filter has coefficients that are adjusted in response to a first adaptation gain value, decision bits, and receiver error values. During a first time period, the coefficients are adjusted until changes in the coefficients are less than a first threshold amount. Then during a second time period, the coefficients are adjusted using a second adaptation gain value until changes in the coefficients are less than a second threshold amount. The second adaptation gain value is less than the first adaptation gain value and the second threshold amount being less than the first threshold amount. By using two or more adjustment periods with different gain values, the filter is adapted faster than using a single adjustment period with fixed adaptation gain.

Abstract translation: 一种在端口中适配发射滤波器的通信端口和方法，用于通过通信信道减少接收器与发射滤波器的接收误差。 滤波器具有响应于第一自适应增益值，判定位和接收器误差值而被调整的系数。 在第一时间段期间，系数被调整直到系数的变化小于第一阈值量。 然后在第二时间段期间，使用第二自适应增益值来调整系数，直到系数的变化小于第二阈值量。 第二自适应增益值小于第一适应增益值，第二阈值量小于第一阈值量。 通过使用具有不同增益值的两个或更多个调整周期，滤波器比使用具有固定自适应增益的单个调整周期更适合。

公开(公告)号：US08649476B2

公开(公告)日：2014-02-11

申请号：US13081651

申请日：2011-04-07

Applicant: Amaresh Malipatil ,  Wingfaat Liu ,  Ye Liu ,  Freeman Y. Zhong ,  Chintan Desai

Inventor： Amaresh Malipatil ,  Wingfaat Liu ,  Ye Liu ,  Freeman Y. Zhong ,  Chintan Desai

IPC: H04B1/38

CPC classification number: H04L7/0062 ,  H04L25/03057 ,  H04L25/03343

Abstract: In described embodiments, a transceiver includes a baud-rate clock and data recovery (CDR) module with an eye sampler, and an adaptation module for adaptively setting parameters of various circuit elements, such as timing, equalizer and gain elements. Data sampling clock phase of the CDR module is set for sampling at, for example, near the center of a data eye detected by the eye sampler, and the phase of data error sampling latch(es) is skewed by the CDR module with respect to the phase of the data sampling latch. Since the error signal driving the timing adaptation contains the information of the pulse response that the CDR module encounters, the phase of timing error sampling latch(es) of the CDR module is skewed based on maintaining a relative equivalence of input pulse response residual pre-cursor and residual post-cursor with respect to the timing error sampling clock phase.

Abstract translation: 在所描述的实施例中，收发器包括具有眼睛取样器的波特率时钟和数据恢复（CDR）模块，以及用于自适应地设置诸如定时，均衡器和增益元件的各种电路元件的参数的适配模块。 CDR模块的数据采样时钟相位被设置为在例如由眼睛采样器检测到的数据眼睛的中心附近进行采样，并且数据错误采样锁存器的相位相对于CDR模块偏移 数据采样锁存器的相位。 由于驱动定时自适应的误差信号包含CDR模块所遇到的脉冲响应的信息，所以基于维持输入脉冲响应残差预测的相对等价，CDR模块的定时误差采样锁存器的相位是偏斜的， 光标和剩余后光标相对于定时误差采样时钟相位。

公开(公告)号：US20120257652A1

公开(公告)日：2012-10-11

申请号：US13081651

申请日：2011-04-07

Applicant: Amaresh Malipatil ,  Wingfaat Liu ,  Ye Liu ,  Freeman Y. Zhong ,  Chintan Desai

Inventor： Amaresh Malipatil ,  Wingfaat Liu ,  Ye Liu ,  Freeman Y. Zhong ,  Chintan Desai

IPC: H04L7/08 ,  H04B1/38 ,  H03H7/30

CPC classification number: H04L7/0062 ,  H04L25/03057 ,  H04L25/03343

Abstract: In described embodiments, a transceiver includes a baud-rate clock and data recovery (CDR) module with an eye sampler, and an adaptation module for adaptively setting parameters of various circuit elements, such as timing, equalizer and gain elements. Data sampling clock phase of the CDR module is set for sampling at, for example, near the center of a data eye detected by the eye sampler, and the phase of data error sampling latch(es) is skewed by the CDR module with respect to the phase of the data sampling latch. Since the error signal driving the timing adaptation contains the information of the pulse response that the CDR module encounters, the phase of timing error sampling latch(es) of the CDR module is skewed based on maintaining a relative equivalence of input pulse response residual pre-cursor and residual post-cursor with respect to the timing error sampling clock phase.

Abstract translation: 在所描述的实施例中，收发器包括具有眼睛采样器的波特率时钟和数据恢复（CDR）模块，以及用于自适应地设置诸如定时，均衡器和增益元件的各种电路元件的参数的适配模块。 CDR模块的数据采样时钟相位被设置为在例如由眼睛采样器检测到的数据眼睛的中心附近进行采样，并且数据错误采样锁存器的相位相对于CDR模块偏移 数据采样锁存器的相位。 由于驱动定时自适应的误差信号包含CDR模块所遇到的脉冲响应的信息，所以基于维持输入脉冲响应残差预测的相对等价，CDR模块的定时误差采样锁存器的相位是偏斜的， 光标和剩余后光标相对于定时误差采样时钟相位。

公开(公告)号：US08711906B2

公开(公告)日：2014-04-29

申请号：US12941217

申请日：2010-11-08

Applicant: Mohammad Mobin ,  Ye Liu ,  Amaresh Malipatil

Inventor： Mohammad Mobin ,  Ye Liu ,  Amaresh Malipatil

IPC: H04B1/38 ,  H04L5/16

CPC classification number: H04L25/03012 ,  H04L2025/03439

Abstract: In described embodiments, a transceiver includes an eye monitor and margin detector having one or more samplers with corresponding logic. One or more programmable provisioning parameters are defined based on a pre-defined minimum target operating margin for acceptable noise and jitter margins. For example, two programmable provisioning parameters, phase and voltage, correspond with thresholds for margin samplers placed within the eye. Initially, the transceiver applies equalization, after which an inner eye of the transceiver, as detected by the eye monitor, is relatively open with some margin for supporting channels. If the receiver margin goes below this target margin, the eye closes, which is registered by the samplers. In the presence of spectrally rich input data, if the receiver margin goes below this target margin, an updated adaptation of equalizer or other circuit parameters might be initiated; else, adaptation is not generally required.

Abstract translation: 在所描述的实施例中，收发器包括具有具有相应逻辑的一个或多个采样器的眼睛监视器和边缘检测器。 基于用于可接受的噪声和抖动余量的预定义的最小目标操作裕度来定义一个或多个可编程供应参数。 例如，两个可编程供应参数（相位和电压）对应于放置在眼睛内的余量采样器的阈值。 最初，收发机应用均衡，之后由眼睛监视器检测到的收发器的内眼相对开放，具有用于支持信道的一些余量。 如果接收机边缘低于该目标边距，则眼睛关闭，由采样器注册。 在存在频谱丰富的输入数据的情况下，如果接收器余量低于该目标余量，则可以启动更新的均衡器或其他电路参数的适配; 否则，通常不需要适应。

公开(公告)号：US08537885B2

公开(公告)日：2013-09-17

申请号：US13410735

申请日：2012-03-02

Applicant: Pervez Aziz ,  Hiroshi Kimura ,  Amaresh Malipatil

Inventor： Pervez Aziz ,  Hiroshi Kimura ,  Amaresh Malipatil

IPC: H03H7/30

CPC classification number: H04L25/03057 ,  H04L25/03885 ,  H04L25/14 ,  H04L2025/0349 ,  H04L2025/03579

Abstract: In described embodiments, a variety of down-sampling techniques are employed to generate a more constrained set of floating-tap positions when compared to floating-tap Decision Feedback Equalization (DFE) architectures that allow unconstrained 1T resolution or separated floating-tap positions. Down-sampling is employed to constrain the floating-tap positions rather than positions occurring with 1T resolution or spacing. Two broad down-sampling techniques, phase pruning and phase amalgamation, are applied to a variety of exemplary DFE implementations. Although the tap positions are more constrained, the architectures select floating-tap positions containing dominant reflection inter-symbol interference (ISI) terms.

Abstract translation: 在所描述的实施例中，当与允许无约束1T分辨率或分离的浮动抽头位置的浮动抽头判决反馈均衡（DFE）架构相比时，采用各种下采样技术来产生更受约束的浮动抽头位置集合。 采用下采样来限制浮动位置，而不是以1T分辨率或间距发生的位置。 两种广泛的下采样技术，相位修剪和相位合并，被应用于各种示例性DFE实现。 虽然抽头位置更受约束，但架构选择包含主要反射符号间干扰（ISI）项的浮动抽头位置。

公开(公告)号：US20130039407A1

公开(公告)日：2013-02-14

申请号：US13410735

申请日：2012-03-02

Applicant: Pervez Aziz ,  Hiroshi Kimura ,  Amaresh Malipatil

Inventor： Pervez Aziz ,  Hiroshi Kimura ,  Amaresh Malipatil

IPC: H03H7/30

CPC classification number: H04L25/03057 ,  H04L25/03885 ,  H04L25/14 ,  H04L2025/0349 ,  H04L2025/03579

Abstract: In described embodiments, a variety of down-sampling techniques are employed to generate a more constrained set of floating-tap positions when compared to floating-tap Decision Feedback Equalization (DFE) architectures that allow unconstrained IT resolution or separated floating-tap positions. Down-sampling is employed to constrain the floating-tap positions rather than positions occurring with IT resolution or spacing. Two broad down-sampling techniques, phase pruning and phase amalgamation, are applied to a variety of exemplary DFE implementations. Although the tap positions are more constrained, the architectures select floating-tap positions containing dominant reflection inter-symbol interference (ISI) terms.

Abstract translation: 在所描述的实施例中，当与允许无约束的IT分辨率或分离的浮动抽头位置的浮动抽头判决反馈均衡（DFE）架构相比时，采用各种下采样技术来生成更受约束的浮动抽头位置集合。 采用下采样来限制浮动位置，而不是以IT分辨率或间距发生的位置。 两种广泛的下采样技术，相位修剪和相位合并，被应用于各种示例性DFE实现。 虽然抽头位置更受约束，但架构选择包含主要反射符号间干扰（ISI）项的浮动抽头位置。

公开(公告)号：US20100329326A1

公开(公告)日：2010-12-30

申请号：US12495547

申请日：2009-06-30

Applicant: Pervez M. Aziz ,  Adam B. Healey ,  Amaresh Malipatil ,  Lizhi Zhong

Inventor： Pervez M. Aziz ,  Adam B. Healey ,  Amaresh Malipatil ,  Lizhi Zhong

IPC: H04L27/01

CPC classification number: H04L25/03057 ,  H04L25/14 ,  H04L2025/03503 ,  H04L2025/03535 ,  H04L2025/03617

Abstract: Methods and apparatus are provided for decision-feedback equalization with an oversampled phase detector. A method is provided for detecting data in a receiver employing decision-feedback equalization. A received signal is sampled using a data clock and a transition clock to generate a data sample signal and a transition sample signal. A DFE correction is obtained for each of the data sample and transition sample signals to generate DFE detected data and DFE transition data. One or more coefficients used for the DFE correction for the transition sample signals are adapted using the DFE transition data.

Abstract translation: 提供了使用过采样相位检测器进行判决反馈均衡的方法和装置。 提供一种用于使用判决反馈均衡来检测接收机中的数据的方法。 使用数据时钟和转换时钟对接收到的信号进行采样，以生成数据采样信号和转换采样信号。 为每个数据采样和转换采样信号获得DFE校正，以产生DFE检测数据和DFE转换数据。 用于转换采样信号的DFE校正的一个或多个系数使用DFE转换数据进行调整。