公开(公告)号：US08855186B2

公开(公告)日：2014-10-07

申请号：US13326753

申请日：2011-12-15

申请人： Kan Tan

发明人： Kan Tan

IPC分类号： H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04L25/03

CPC分类号： H04L25/03057 ,  H04L25/03885

摘要： Computationally efficient methods and related systems, for use in a test and measurement instrument, such as an oscilloscope, optimize the performance of DFEs used in a high-speed serial data link by identifying optimal DFE tap values for peak-to-peak based criteria. The optimized DFEs comply with the behavior of a model DFE set forth in the PCIE 3.0 specification.

摘要翻译： 用于测试和测量仪器（如示波器）中的计算有效的方法和相关系统通过识别基于峰 - 峰的标准的最佳DFE抽头值来优化高速串行数据链路中使用的DFE的性能。 优化的DFE符合PCIE 3.0规范中规定的DFE型号的行为。

公开(公告)号：US20130093493A1

公开(公告)日：2013-04-18

申请号：US13271923

申请日：2011-10-12

申请人： John J. PICKERD ,  Kan TAN

发明人： John J. PICKERD ,  Kan TAN

IPC分类号： G06G7/14

CPC分类号： G01R13/0218 ,  G01R13/0236 ,  G01R13/0272 ,  G01R19/2506

摘要： An apparatus and method for splitting a wide band input signal and overlaying multiple frequency bands on each path associated with one or more digitizers. All frequencies from the split signal on each path can be fed to a mixer. The local oscillator of each mixer receives a sum of signals, which can each be set to any arbitrary frequency, as long as an associated matrix determinant of coefficients is non-zero. Each oscillator signal is multiplied by a coefficient, which can represent phase and magnitude, prior to summing the oscillator signals together. Each mixer mixes a combined signal with the input, thereby generating a set of multiple overlaid frequency bands. The digitized signals are processed to substantially reconstruct the original input signal. Thus, the wide band input signal is digitized using multiple individual digitizers. In particular, a system can support two wide band signals using four digitizers of narrower bandwidth.

摘要翻译： 一种用于分割宽带输入信号并在与一个或多个数字化仪相关联的每个路径上重叠多个频带的装置和方法。 来自每个路径上的分割信号的所有频率可以馈送到混频器。 每个混合器的本地振荡器接收信号总和，其可以被设置为任何任意频率，只要系数的相关联的矩阵行列式不为零。 在将振荡器信号相加在一起之前，每个振荡器信号乘以可表示相位和幅度的系数。 每个混合器将组合的信号与输入混合，从而生成一组多个重叠的频带。 处理数字化信号以基本上重建原始输入信号。 因此，使用多个单独的数字化仪将宽带输入信号数字化。 特别地，系统可以使用具有较窄带宽的四个数字化仪来支持两个宽带信号。

公开(公告)号：US20120320964A1

公开(公告)日：2012-12-20

申请号：US13326753

申请日：2011-12-15

申请人： Kan TAN

发明人： Kan TAN

IPC分类号： H04L27/01

CPC分类号： H04L25/03057 ,  H04L25/03885

摘要： Computationally efficient methods and related systems, for use in a test and measurement instrument, such as an oscilloscope, optimize the performance of DFEs used in a high-speed serial data link by identifying optimal DFE tap values for peak-to-peak based criteria. The optimized DFEs comply with the behavior of a model DFE set forth in the PCIE 3.0 specification.

摘要翻译： 用于测试和测量仪器（如示波器）中的计算有效的方法和相关系统通过识别基于峰 - 峰的标准的最佳DFE抽头值来优化高速串行数据链路中使用的DFE的性能。 优化的DFE符合PCIE 3.0规范中规定的DFE型号的行为。

公开(公告)号：US07460983B2

公开(公告)日：2008-12-02

申请号：US11508460

申请日：2006-08-23

申请人： John J. Pickerd ,  Kan Tan ,  William A. Hagerup ,  Rolf P. Anderson ,  Sharon M. Mc Masters

发明人： John J. Pickerd ,  Kan Tan ,  William A. Hagerup ,  Rolf P. Anderson ,  Sharon M. Mc Masters

IPC分类号： G06F19/00 ,  G06F17/40

CPC分类号： G01R35/005 ,  G01R1/24 ,  G01R31/3191 ,  G01R35/002

摘要： A method and apparatus adapted to calibrate a signal path of a signal analysis system such that loading effects of the system are substantially removed from measurements of a device under test. A signal under test from the device under test is coupled to a test probe in the signal path and used with selectable impedance loads in the test probe to characterize transfer parameters of the device under test. An equalization filter in either the frequency or time domain is computed from the device under test transfer parameters for reducing in signal error attributable to the measurement loading of the device under test.

摘要翻译： 一种适于校准信号分析系统的信号路径的方法和装置，使得系统的加载效应基本上从被测设备的测量中移除。 来自被测器件的被测信号被耦合到信号路径中的测试探头，并与测试探头中的可选阻抗负载一起使用，以表征被测器件的传输参数。 频率或时域中的均衡滤波器由被测器件的传输参数计算，用于减少归因于被测器件测量负载的信号误差。

公开(公告)号：US20080082278A1

公开(公告)日：2008-04-03

申请号：US11529855

申请日：2006-09-28

申请人： Kan Tan ,  John J. Pickerd

发明人： Kan Tan ,  John J. Pickerd

IPC分类号： G06F19/00

CPC分类号： G01R13/0254 ,  G01R23/16

摘要： A realtime spectrum trigger system on a realtime oscilloscope considers both the magnitude and phase of an input signal having a periodic component so that successive acquisitions of the input signal are time aligned. A user inputs a frequency, threshold and phase for triggering on the periodic component. Input signal samples are filtered by quadrature filters according to the frequency input to produce quadrature signal components. The square of the magnitude of the input signal is computed from the quadrature signal components, as well as the phase ratio and sign, for comparison with calculated values. When enabled by the magnitude of the input signal, a phase crossing determinator compares the phase ratio and sign with calculated values to determine the phase crossing to generate a trigger, resulting in successive acquisitions of the input signal being in time alignment.

摘要翻译： 实时示波器上的实时频谱触发系统考虑具有周期分量的输入信号的幅度和相位，使得输入信号的连续采集是时间对准的。 用户输入频率，阈值和相位以在周期性分量上触发。 输入信号样本根据频率输入由正交滤波器滤波，产生正交信号分量。 根据正交信号分量计算输入信号幅度的平方以及相位比和符号，以便与计算值进行比较。 当通过输入信号的幅度使能时，相位越过判定器将相位比和符号与计算值进行比较，以确定相位交叉以产生触发，从而导致输入信号在时间上对准的连续采集。

公开(公告)号：US20080080605A1

公开(公告)日：2008-04-03

申请号：US11529856

申请日：2006-09-28

申请人： Kan Tan ,  John C. Calvin ,  Kalev Sepp

发明人： Kan Tan ,  John C. Calvin ,  Kalev Sepp

IPC分类号： H04B3/46

CPC分类号： H04L1/205 ,  G01R29/26 ,  G01R31/31709

摘要： A method of measuring transport delay and jitter with a realtime oscilloscope using cross-correlation acquires waveforms from two test points in a system under test. Clock recovery is run on both waveforms to obtain respective rates and offsets. A time offset between the two waveforms is computed. The jitter from the two test points is filtered and a mean-removed cross-correlation coefficient is computed from the filtered jitters. A fractional delay is computed using interpolation based on LMS error, and the respective computational components are summed to compute a transport delay between the two test points. The transport delay may be used to adjust clock edges from one waveform for comparison with data transition edges of the other waveform to measure jitter.

摘要翻译： 使用互相关的实时示波器测量传输延迟和抖动的方法从被测系统的两个测试点获取波形。 在两个波形上运行时钟恢复以获得相应的速率和偏移量。 计算两个波形之间的时间偏移。 对两个测试点的抖动进行滤波，并从滤波的抖动中计算平均去除的互相关系数。 使用基于LMS误差的插值计算分数延迟，并将相应的计算组件相加以计算两个测试点之间的传输延迟。 传输延迟可用于从一个波形调整时钟边沿，以便与其他波形的数据转换边沿进行比较，以测量抖动。

公开(公告)号：US20050234668A1

公开(公告)日：2005-10-20

申请号：US11083612

申请日：2005-03-17

申请人： Kan Tan

发明人： Kan Tan

IPC分类号： G01R29/02 ,  G01R29/027

CPC分类号： G01R29/0273

摘要： A transition-density based data timing measurement method uses an estimated transition density (TD) value for an acquired data signal together with edge crossing times to estimate a data period for the acquired data signal. The estimated data period is used for symbol classification to determine a number of bits between adjacent edge crossings, which results are used to adjust the TD value. The adjusted TD value is then used to re-compute the data period.

摘要翻译： 基于转换密度的数据定时测量方法使用所获取的数据信号的估计转移密度（TD）值和边缘交叉时间来估计所获取的数据信号的数据周期。 估计的数据周期用于符号分类以确定相邻边缘交叉点之间的位数，该结果用于调整TD值。 然后调整的TD值用于重新计算数据周期。

公开(公告)号：US20050232345A1

公开(公告)日：2005-10-20

申请号：US11098883

申请日：2005-04-04

申请人： Benjamin Ward ,  Kan Tan ,  Mark Guenther

发明人： Benjamin Ward ,  Kan Tan ,  Mark Guenther

IPC分类号： H04L1/20 ,  H04Q1/20

CPC分类号： H04L1/205

摘要： For a jitter measurement product histograms, trends and spectrums of random and deterministic jitter components are provided on a jitter component basis rather than just on overall jitter. At each stage of the jitter separation histograms, time trends (measurement vs. time), cycle trends (measurement vs. cycle or UI) or spectrums may be provided. Additionally the spectrum for a periodic jitter component may be further separated into sub-spectrums representing correlated sub-sets of the periodic jitter component. Conversion of each sub-spectrum into the time domain provides a characteristic signal that may identify one source of the periodic jitter. From the various plots the contribution of a particular jitter component or a particular combination of jitter components to an eye opening and system performance may be obtained.

摘要翻译： 对于抖动测量产品，随机和确定性抖动分量的直方图，趋势和频谱在抖动分量基础上提供，而不仅仅是总体抖动。 在抖动分离直方图的每个阶段，可以提供时间趋势（测量与时间），周期趋势（测量对周期或UI）或频谱。 另外，周期性抖动分量的频谱可以被进一步分成表示周期性抖动分量的相关子集的子谱。 将每个子频谱转换成时域提供可识别周期性抖动的一个来源的特征信号。 从各种曲线图可以获得特定抖动分量或抖动分量的特定组合对眼睛打开和系统性能的贡献。

公开(公告)号：US09130751B2

公开(公告)日：2015-09-08

申请号：US13337052

申请日：2011-12-24

申请人： Pavel R. Zivny ,  Maria Agoston ,  Kan Tan

发明人： Pavel R. Zivny ,  Maria Agoston ,  Kan Tan

IPC分类号： G06F17/10 ,  H04L1/20

CPC分类号： H04L43/087 ,  H04L1/205 ,  H04L43/045

摘要： Method and systems are described for estimating signal impairments, in particular jitter that includes uncorrelated, non-periodic signal impairments. One system may take the form of an oscilloscope. The estimates may take the form of a probability density function (PDF) for uncorrelated signal impairments that has been modified to replace low probability regions with a known approximation and an extrapolation of the known approximation.

摘要翻译： 描述了用于估计信号损伤的方法和系统，特别是包括不相关的非周期信号损伤的抖动。 一个系统可能采用示波器的形式。 估计可以采用未相关信号损伤的概率密度函数（PDF）的形式，其已经被修改以用已知近似的已知近似和外推来代替低概率区域。

公开(公告)号：US08891603B2

公开(公告)日：2014-11-18

申请号：US13531917

申请日：2012-06-25

申请人： Kan Tan ,  John J. Pickerd

发明人： Kan Tan ,  John J. Pickerd

IPC分类号： H04B3/46 ,  H04B17/00 ,  H04Q1/20

CPC分类号： H04B3/46 ,  G01R27/28

摘要： A device and method of re-sampling a plurality of S-parameters for serial data link analysis is disclosed. The method includes storing a plurality of S-parameters sets, each S-parameter set being associated with a subsystem and having associated impulse responses and a time interval. An increased time interval is determined based on the time interval associated with each S-parameter set. The impulse responses are zero filled in each S-parameter set to maintain any wrapped ripples and increase the time interval. A plurality of resampled S-parameter sets are generated with a finer frequency resolution to cover the increased time interval.

摘要翻译： 公开了一种用于重新采样用于串行数据链路分析的多个S参数的装置和方法。 该方法包括存储多个S参数集合，每个S-参数集合与子系统相关联并且具有相关联的脉冲响应和时间间隔。 基于与每个S参数集相关联的时间间隔来确定增加的时间间隔。 脉冲响应在每个S参数集中零填充，以保持任何包裹的波纹并增加时间间隔。 以更精细的频率分辨率生成多个重新采样的S参数集，以覆盖增加的时间间隔。