公开(公告)号：US20070139108A1

公开(公告)日：2007-06-21

申请号：US11672272

申请日：2007-02-07

申请人： Mohammad Mobin ,  Jeffrey Saunders ,  Lane Smith

发明人： Mohammad Mobin ,  Jeffrey Saunders ,  Lane Smith

IPC分类号： H03F1/26

CPC分类号： H03F1/3241 ,  H03F2200/468

摘要： A pre-distorter that compensates for amplitude and phase distortion created by an amplifier. During a training session, the amplifier is stimulated with input signals of pre-selected amplitude and phase at various temperatures and the amplifier output is captured and converted into data sets. Polynomials are then fitted to the data sets and inverses of the polynomials are determined. The coefficients of the inverse polynomials are then saved for each temperature. During operation, the amplifier temperature is predicted based on the amplifier input signal and the coefficients associated with the predicted temperature are selected to be applied to the input signal to compensate for amplitude and phase distortion caused by the amplifier.

摘要翻译： 一个预失真器，用于补偿放大器产生的幅度和相位失真。 在训练期间，放大器用各种温度的预选幅度和相位的输入信号进行激励，并且放大器输出被捕获并转换为数据集。 然后将多项式拟合到数据集中，并确定多项式的倒数。 然后针对每个温度保存逆多项式的系数。 在操作期间，基于放大器输入信号预测放大器温度，并且选择与预测温度相关联的系数以施加到输入信号以补偿由放大器引起的幅度和相位失真。

公开(公告)号：US20060033569A1

公开(公告)日：2006-02-16

申请号：US10919029

申请日：2004-08-16

申请人： Mohammad Mobin ,  Jeffrey Saunders ,  Lane Smith

发明人： Mohammad Mobin ,  Jeffrey Saunders ,  Lane Smith

IPC分类号： H03F1/26

CPC分类号： H03F1/3241 ,  H03F2200/468

摘要： A pre-distorter that compensates for amplitude and phase distortion created by an amplifier. During a training session, the amplifier is stimulated with input signals of pre-selected amplitude and phase at various temperatures and the amplifier output is captured and converted into data sets. Polynomials are then fitted to the data sets and inverses of the polynomials are determined. The coefficients of the inverse polynomials are then saved for each temperature. During operation, the amplifier temperature is predicted based on the amplifier input signal and the coefficients associated with the predicted temperature are selected to be applied to the input signal to compensate for amplitude and phase distortion caused by the amplifier.

摘要翻译： 一个预失真器，用于补偿放大器产生的幅度和相位失真。 在训练期间，放大器用各种温度的预选幅度和相位的输入信号进行激励，并且放大器输出被捕获并转换为数据集。 然后将多项式拟合到数据集中，并确定多项式的倒数。 然后针对每个温度保存逆多项式的系数。 在操作期间，基于放大器输入信号预测放大器温度，并且选择与预测温度相关联的系数以施加到输入信号以补偿由放大器引起的幅度和相位失真。

公开(公告)号：US07812749B2

公开(公告)日：2010-10-12

申请号：US12380639

申请日：2009-03-02

申请人： Christopher Abel ,  Mohammad Mobin ,  Robert Kapuschinsky ,  Lane Smith ,  Paul Tracy ,  Gregory Sheets

发明人： Christopher Abel ,  Mohammad Mobin ,  Robert Kapuschinsky ,  Lane Smith ,  Paul Tracy ,  Gregory Sheets

IPC分类号： H03M1/06

CPC分类号： H04L25/061

摘要： In described embodiments, a communication system employing, for example, clock and data recovery (CDR) detects and applies correction for DC offset in an input data stream signal, termed as “DC offset calibration”. DC offset calibration applies static calibration for DC offset in input circuits, such as an input amplifier and detection latches, without input data, and applies statistical calibration for DC offset during operation with an input data stream to correct for dynamic shifts in DC level. Such DC offset calibration employs data eye measurements of the input data stream for detection of DC offset, and applies an opposite DC offset to maintain a relatively balanced data eye during live traffic.

摘要翻译： 在所描述的实施例中，采用例如时钟和数据恢复（CDR）的通信系统在输入数据流信号中检测并应用校正DC偏移，称为“DC偏移校准”。 DC偏移校准在输入电路（如输入放大器和检测锁存器）中对直流偏移进行静态校准，无输入数据，并在输入数据流运行期间对DC偏移进行统计校准，以校正直流电平的动态偏移。 这种DC偏移校准使用用于检测DC偏移的输入数据流的数据眼睛测量，并施加相反的DC偏移以在实时业务期间维持相对平衡的数据眼睛。

公开(公告)号：US20070074084A1

公开(公告)日：2007-03-29

申请号：US11235872

申请日：2005-09-27

申请人： Mohammad Mobin ,  Gregory Sheets ,  Lane Smith

发明人： Mohammad Mobin ,  Gregory Sheets ,  Lane Smith

IPC分类号： G11B20/20 ,  G06K5/04 ,  G11B5/00

CPC分类号： G06F13/4213

摘要： Methods and apparatus are provided for monitoring and compensating for skew on a high speed parallel bus. Delay skew for a plurality of signals on a parallel bus is monitored by obtaining a plurality of samples of the plurality of signals for each unit interval; and identifying a location of transitions in the plurality of signals based on the samples. The samples can be obtained, for example, by sampling the plurality of signals using a plurality of latches and estimating a value of one or more of the plurality of signals by comparing values of the latches. A microprocessor can optionally be employed to determine a relative distribution of transitions in the plurality of signals and to align transitions in the plurality of signals to a common position. The transitions in the plurality of signals can be aligned to a common position by adjusting a delay control setting for a buffer associated with each of the plurality of signals.

摘要翻译： 提供了用于监视和补偿高速并行总线上的偏斜的方法和装置。 通过获得每个单位间隔的多个信号的多个样本来监视并行总线上的多个信号的延迟偏移; 以及基于所述样本来识别所述多​​个信号中的转变的位置。 可以例如通过使用多个锁存器对多个信号进行采样并且通过比较锁存器的值来估计多个信号中的一个或多个的值来获得样本。 可以可选地使用微处理器来确定多个信号中的转变的相对分布并且将多个信号中的转变对准到公共位置。 通过调整与多个信号中的每个信号相关联的缓冲器的延迟控制设置，多个信号中的转换可以对齐到公共位置。

公开(公告)号：US08045608B2

公开(公告)日：2011-10-25

申请号：US12221002

申请日：2008-07-30

申请人： Xingdong Dai ,  Geoffrey Zhang ,  Max Olsen ,  Dwight Daugherty ,  Gary Schiessler ,  Mohammad Mobin ,  Lane Smith ,  Dennis Farley

发明人： Xingdong Dai ,  Geoffrey Zhang ,  Max Olsen ,  Dwight Daugherty ,  Gary Schiessler ,  Mohammad Mobin ,  Lane Smith ,  Dennis Farley

IPC分类号： H03H7/30

CPC分类号： H04L25/03057 ,  H04L2025/03592

摘要： In described embodiments, an adaptive equalizer employed by a receiver in a communication channel, such as Fibre Channel, employs pattern recognition. When a repeating pattern, such as an IDLE or ARBFF pattern, is employed by a standard to, for example, maintain a communication link, an equalizer of the receiver might adaptively set its equalizer parameters based on characteristics of the signal energy of the repeating pattern rather than adaptively set its equalizer parameters based on characteristics of the signal energy of generally random user data carried on the link. Pattern recognition by the receiver allows for maintaining adaptive equalizer parameters at settings preferred for data detection of the typical random data, improving data detection performance of the receiver when the channel transitions from a preset or synchronization repeating pattern to a user random data pattern.

摘要翻译： 在所描述的实施例中，由诸如光纤通道的通信信道中的接收机使用的自适应均衡器使用模式识别。 当诸如空闲或ARBFF模式的重复模式被标准采用以例如维持通信链路时，接收机的均衡器可以基于重复模式的信号能量的特性来自适应地设置其均衡器参数 而不是基于在链路上携带的一般随机用户数据的信号能量的特性自适应地设置其均衡器参数。 接收机的模式识别允许在优选用于典型随机数据的数据检测的设置下维持自适应均衡器参数，当信道从预设或同步重复模式转换到用户随机数据模式时，提高接收机的数据检测性能。

公开(公告)号：US20070253477A1

公开(公告)日：2007-11-01

申请号：US11414522

申请日：2006-04-28

申请人： Christopher Abel ,  Mohammad Mobin ,  Gregory Sheets ,  Vladimir Sindalovsky ,  Lane Smith

发明人： Christopher Abel ,  Mohammad Mobin ,  Gregory Sheets ,  Vladimir Sindalovsky ,  Lane Smith

IPC分类号： H03H7/30

CPC分类号： H04L25/062 ,  H04L25/03057

摘要： Methods and apparatus are provided for determining a position of an offset latch employed for decision-feedback equalization. The position of an offset latch is determined by obtaining a plurality of samples of a data eye associated with a signal, the data eye comprised of a plurality of trajectories for transitions out of a given binary state; determining an amplitude of at least two of the trajectories based on the samples; and determining a position of an offset latch based on the determined amplitudes. The initial position of the offset latch can be placed, for example, approximately in the middle of the determined amplitudes for at least two of the trajectories. The initial position of the offset latch can be optionally skewed by a predefined amount to improve the noise margin.

摘要翻译： 提供了用于确定用于判决反馈均衡的偏移锁存器的位置的方法和装置。 通过获得与信号相关联的数据眼睛的多个采样来确定偏移锁存器的位置，数据眼睛包括用于从给定二进制状态转换的多个轨迹; 基于样本确定至少两个轨迹的振幅; 以及基于所确定的振幅来确定偏移锁存器的位置。 偏移锁存器的初始位置可以被放置在例如至少两个轨迹的确定幅度的大约中间。 偏移锁存器的初始位置可以可选地倾斜预定义的量以改善噪声容限。

公开(公告)号：US20070147555A1

公开(公告)日：2007-06-28

申请号：US11318953

申请日：2005-12-23

申请人： Mohammad Mobin ,  Gregory Sheets ,  Lane Smith

发明人： Mohammad Mobin ,  Gregory Sheets ,  Lane Smith

IPC分类号： H04L27/08

CPC分类号： H04L25/063 ,  H03G3/30 ,  H03G3/3036 ,  H03G3/3052

摘要： Methods and apparatus are provided for adjusting receiver gain based on received signal envelope detection. The gain of a received signal is adjusted by obtaining a plurality of samples of the received signal for a given unit interval; determining an amplitude of the received signal based on the samples; and adjusting a receiver gain based on the determined amplitude. The received signal can be sampled, for example, using a plurality of latches. The value of the received signal can then be estimated by evaluating one or more of the latch values. Once the amplitude of the received signal is determined, one or more latches can be positioned at a desired target amplitude and the receiver gain can be adjusted until the amplitude of the received signal is within a desired tolerance of the specified target value.

摘要翻译： 提供了基于接收信号包络检测来调整接收机增益的方法和装置。 通过获得给定单位间隔的接收信号的多个样本来调整接收信号的增益; 基于样本确定接收信号的幅度; 以及基于所确定的幅度来调整接收机增益。 可以例如使用多个锁存器对接收到的信号进行采样。 然后可以通过评估一个或多个锁存值来估计接收信号的值。 一旦确定了接收信号的幅度，就可以将一个或多个锁存器定位在期望的目标幅度，并且可以调整接收器增益，直到接收信号的振幅在指定目标值的期望公差内。

公开(公告)号：US20050078758A1

公开(公告)日：2005-04-14

申请号：US10964056

申请日：2004-10-12

申请人： Pervez Aziz ,  Donald Laturell ,  Mohammad Mobin ,  Gregory Sheets ,  Lane Smith

发明人： Pervez Aziz ,  Donald Laturell ,  Mohammad Mobin ,  Gregory Sheets ,  Lane Smith

IPC分类号： G01R31/317 ,  H04B3/00 ,  H04B3/04 ,  H04L25/03

CPC分类号： G01R31/31715 ,  H04B3/04 ,  H04L25/03038 ,  H04L2025/03356 ,  H04L2025/03477 ,  H04L2025/03617

摘要： In training a SERDES, a Common Electrical Interface (CEI) training frame, having certain bits of information embedded therein, is transmitted over a path which comprises transmitter, channel, and receiver components. The present invention analyzes the resulting received signal and determines the effective aggregate channel impulse response of these three components. The invention then determines an estimate of the inverse of this aggregate channel and uses this determination to reduce distortions that have been introduced into a signal that has been transmitted over the path.

摘要翻译： 在训练SERDES时，通过包含发射机，信道和接收机组件的路径发送具有嵌入其中的某些信息位的公共电接口（CEI）训练帧。 本发明分析所得到的接收信号并确定这三个分量的有效总信道脉冲响应。 然后，本发明确定该聚合信道的逆的估计，并且使用该确定来减少已经被引入到已经通过该路径传输的信号中的失真。

公开(公告)号：US20060267657A1

公开(公告)日：2006-11-30

申请号：US11141703

申请日：2005-05-31

申请人： Ronald Freyman ,  Mohammad Mobin ,  Vladimir Sindalovsky ,  Lane Smith

发明人： Ronald Freyman ,  Mohammad Mobin ,  Vladimir Sindalovsky ,  Lane Smith

IPC分类号： H03H11/26

CPC分类号： H03L7/0814 ,  H04L7/0337

摘要： A parallel trimming method and apparatus are provided for a voltage controlled delay loop. A plurality of delay units in a voltage controlled delay loop are trimmed. Each delay unit comprises a delay element and a latch buffer. A reference signal is applied to each of the delay units and a position of an edge (such as a rising or falling edge) associated with each of the delay units is identified. The edges of the delay units are then aligned by adjusting a trim setting of the respective latch buffer.

公开(公告)号：US20060222135A1

公开(公告)日：2006-10-05

申请号：US11095770

申请日：2005-03-31

申请人： Mohammad Mobin ,  Gregory Sheets ,  Lane Smith ,  Craig Ziemer

发明人： Mohammad Mobin ,  Gregory Sheets ,  Lane Smith ,  Craig Ziemer

IPC分类号： H04L7/00

CPC分类号： H03K5/13 ,  H03K2005/00052 ,  H04L7/00

摘要： Methods and apparatus are provided for digital linearization of an analog phase interpolator. Up to 2N desired phase values are mapped to a corresponding M bit value, where M is greater than N. A corresponding M bit value is applied to the phase interpolator to obtain a desired one of the 2N desired phase values. A linearized phase interpolator is also provided that accounts for process, voltage, temperature or aging (PVTA) variations.

摘要翻译： 提供了用于模拟相位内插器的数字线性化的方法和装置。 所需的相位值最多可映射到相应的M比特值，其中M大于N。相应的M比特值被施加到相位插值器，以获得2' SUP> N <期望相位值。 还提供了线性化相位内插器，其考虑过程，电压，温度或老化（PVTA）变化。