公开(公告)号：US07460592B2

公开(公告)日：2008-12-02

申请号：US11122262

申请日：2005-05-04

Applicant: Takahiro Yamaguchi ,  Mani Soma ,  Masahiro Ishida

Inventor： Takahiro Yamaguchi ,  Mani Soma ,  Masahiro Ishida

IPC: H04B3/46 ,  H04B17/00 ,  H03K9/00

CPC classification number: G01R31/31709

Abstract: There is provided a jitter measuring apparatus for measuring jitter in a signal-under-measurement, having a signal converting section for calculating a spectrum of the signal-under-measurement, a bandwidth calculating section for calculating frequency where a saturation rate of a value of the integrated spectrum of the signal-under-measurement becomes almost equal to a saturation rate set in advance in a band-to-be-measured set in advance as upper cutoff frequency of the band-to-be-measured to calculate the jitter and a jitter calculating section for measuring the jitter in the signal-under-measurement based on the spectaum in the band-to-be-measured of the signal-under-measurement.

Abstract translation: 提供了一种用于测量测量信号中的抖动的抖动测量装置，具有用于计算测量信号的频谱的信号转换部分，用于计算频率的饱和率的频率的带宽计算部分， 信号未测量的综合频谱几乎等于预先设定在要测量的频带中的设定​​的饱和速率，作为要测量的频带的上限截止频率以计算抖动，并且 抖动计算部分，用于根据待测信号的测量范围内的光谱测量测量信号中的抖动。

公开(公告)号：US07356109B2

公开(公告)日：2008-04-08

申请号：US11585526

申请日：2006-10-23

Applicant: Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

Inventor： Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

IPC: H04L7/00

CPC classification number: G01R31/31709 ,  G01R31/31725 ,  G01R31/31922 ,  G01R31/31937 ,  H04L1/205

Abstract: Timing jitter sequences Δφj[n] and Δφk[n] of respective clock signals under measurement xj(t) and xk(t) are estimated, and a timing difference sequence between those timing jitter sequences is calculated. In addition, initial phase angles φ0j and φ0k of linear instantaneous phases of the xj(t) and xk(t) are estimated, respectively. A sum of a difference between those initial angles and the timing difference sequence is calculated to obtain a clock skew sequence between the xj(t) and xk(t).

Abstract translation: （t）和x k（t），并且计算那些定时抖动序列之间的定时差异序列。 另外，x 0 和＆lt; 0＆lt; 0＆gt; （t）和x（k）分别被估计。 计算出这些初始角度和定时差分序列之间的差值的和，以获得x j（t）和x k（t）之间的时钟偏移序列。

公开(公告)号：US20070036256A1

公开(公告)日：2007-02-15

申请号：US11585526

申请日：2006-10-23

Applicant: Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

Inventor： Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

IPC: H04L7/00

CPC classification number: G01R31/31709 ,  G01R31/31725 ,  G01R31/31922 ,  G01R31/31937 ,  H04L1/205

Abstract: Timing jitter sequences Δφj[n] and Δφk[n] of respective clock signals under measurement xj(t) and xk(t) are estimated, and a timing difference sequence between those timing jitter sequences is calculated. In addition, initial phase angles φ0j and φ0k of linear instantaneous phases of the xj(t) and xk(t) are estimated, respectively. A sum of a difference between those initial angles and the timing difference sequence is calculated to obtain a clock skew sequence between the xj(t) and xk(t).

Abstract translation: （t）和x k（t），并且计算那些定时抖动序列之间的定时差异序列。 另外，x 0 和＆lt; 0＆lt; 0＆gt; （t）和x（k）分别被估计。 计算出这些初始角度和定时差分序列之间的差值的和，以获得x j（t）和x k（t）之间的时钟偏移序列。

公开(公告)号：US20060268970A1

公开(公告)日：2006-11-30

申请号：US11137786

申请日：2005-05-25

Applicant: Kiyotaka Ichiyama ,  Masahiro Ishida ,  Takahiro Yamaguchi ,  Mani Soma

Inventor： Kiyotaka Ichiyama ,  Masahiro Ishida ,  Takahiro Yamaguchi ,  Mani Soma

IPC: H04B3/46

CPC classification number: G01R31/31709

Abstract: There is provided a jitter measuring apparatus for measuring jitter in a signal-under-measurement, including a pulse generating section having first pulse generating means for detecting edges of the data-signal-under-measurement to output a first pulse signal having a pulse width set in advance corresponding to the edge and second pulse generating means for detecting boundaries of data sections where data values do not change in the data-signal-under-measurement to output a second pulse signal having a pulse width set in advance over the edge timings of the boundaries of the detected data sections and a jitter calculating section for calculating timing jitter in the data-signal-under-measurement based on the first and second pulse signals.

公开(公告)号：US20060018418A1

公开(公告)日：2006-01-26

申请号：US10896751

申请日：2004-07-22

Applicant: Kiyotaka Ichiyama ,  Masahiro Ishida ,  Takahiro Yamaguchi ,  Mani Soma

Inventor： Kiyotaka Ichiyama ,  Masahiro Ishida ,  Takahiro Yamaguchi ,  Mani Soma

IPC: H03D3/24

CPC classification number: G01R31/31709 ,  G01R29/26 ,  G01R31/3016 ,  G01R31/31725 ,  G01R31/3191 ,  G01R31/31937

Abstract: A jitter measurement apparatus for measuring an intrinsic jitter of a circuit to be tested including a phase detector which outputs a signal according to a phase difference between a supplied first input signal and a supplied second input signal, includes: an input unit for supplying an identical signal to the phase detector as the first input signal and as the second input signal; and a jitter measurement unit for measuring the intrinsic jitter of the circuit to be tested by measuring a jitter of a signal which is generated in an inside of the circuit to be tested according to an signal output from the phase detector.

公开(公告)号：US06687629B1

公开(公告)日：2004-02-03

申请号：US09408280

申请日：1999-09-29

Applicant: Takahiro Yamaguchi ,  Mani Soma ,  Masahiro Ishida ,  Yasuo Furukawa ,  Toshifumi Watanabe

Inventor： Takahiro Yamaguchi ,  Mani Soma ,  Masahiro Ishida ,  Yasuo Furukawa ,  Toshifumi Watanabe

IPC: G01R2926

CPC classification number: G01R29/26

Abstract: A clock waveform XC(t) is transformed into a complex analytic signal using a Hilbert transformer and an instantaneous phase of this analytic signal is estimated. A linear phase is subtracted from the instantaneous phase to obtain a varying term &Dgr;&phgr;(t). A difference between the maximum value and the minimum value of the varying term &Dgr;&phgr;(t) is obtained as a peak-to-peak jitter, and a root-mean-square of the varying term &Dgr;&phgr;(t) is calculated to obtain an RMS jitter.

Abstract translation: 使用希尔伯特变换器将时钟波形XC（t）变换为复数分析信号，并估计该分析信号的瞬时相位。 从瞬时相位减去线性相位以获得变化项Deltaphi（t）。 获得变化项Deltaphi（t）的最大值和最小值之间的差作为峰 - 峰抖动，并且计算变化项Deltaphi（t）的均方根以获得RMS 抖动。

公开(公告)号：US06594595B2

公开(公告)日：2003-07-15

申请号：US09826295

申请日：2001-04-03

Applicant: Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

Inventor： Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

IPC: G01R1300

CPC classification number: G06F17/15

Abstract: Timing jitter sequences &Dgr;&phgr;j[n] and &Dgr;&phgr;k[n] of respective clock signals under measurement xj(t) and xk(t) are obtained, and a covariance &sgr;tj,tk=(1/N)&Sgr;i=1N&Dgr;&phgr;j[i]·&Dgr;&phgr;k[i] is obtained. In addition, root-mean-square values &sgr;tj and &sgr;tk of the respective &Dgr;&phgr;j[n] and &Dgr;&phgr;k[n] are obtained, and a cross-correlation coefficient &rgr;=&sgr;tj,tk/(&sgr;tj·&sgr;tk) between the xj(t) and xk(t) is calculated.

公开(公告)号：US06460001B1

公开(公告)日：2002-10-01

申请号：US09538135

申请日：2000-03-29

Applicant: Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

Inventor： Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

IPC: G06F1900

CPC classification number: G01R29/26 ,  H04L1/205

Abstract: An input clock signal is transformed into a complex analytic signal zc(t) by an analytic signal transforming means 13 and an instantaneous phase of its real part xc(t) is estimated using the analytic signal zc(t). A linear phase is removed from the instantaneous phase to obtain a phase noise waveform &Dgr;&phgr;(t). A peak value &Dgr;&phgr;max of absolute values of the &Dgr;&phgr;(t) is obtained, and 4&Dgr;&phgr;max is defined as the worst value of period jitter of the input signal. The &Dgr;&phgr;(t) is sampled at a timing close to a zero-crossing point of the xc(t) to extract the sample value. A differential between adjacent samples is obtained in the sequential order to calculate a root-mean-square value of the differentials (period jitters). An exp(−(2&Dgr;&phgr;max)2/(2&sgr;j2)) is calculated from the mean-square value &sgr;j and 2&Dgr;&phgr;max, and the calculated value is defined as a probability that a period jitter exceeds 2&Dgr;&phgr;max.

Abstract translation: 通过分析信号变换装置13将输入时钟信号变换为复数分析信号zc（t），并使用分析信号zc（t）估计其实部xc（t）的瞬时相位。 从瞬时相位除去线性相位以获得相位噪声波形DELTAphi（t）。 获得DELTAphi（t）绝对值的峰值DELTAphimax，将4DELTAphimax定义为输入信号周期抖动的最差值。 在接近xc（t）的过零点的定时采样DELTA（t），以提取样本值。 按顺序获得相邻样本之间的差分，以计算差分的均方根（周期抖动）。 根据平均值sigmaj和2DELTAphimax计算出exp（ - （2DELTAphimax）2 /（2sigmaj2）），计算出的值被定义为周期抖动超过2DELTAphimax的概率。

公开(公告)号：US06400129B1

公开(公告)日：2002-06-04

申请号：US09494321

申请日：2000-01-28

Applicant: Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

Inventor： Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma

IPC: G01R2500

CPC classification number: G01R31/3016 ,  G01R25/00 ,  G01R31/2839

Abstract: There is provided a method and an apparatus for detecting a delay fault in a phase-locked loop circuit. A frequency impulse is applied to the PLL circuit under test as a reference clock, and a waveform of a signal outputted from the PLL circuit under test is transformed to an analytic signal to estimate its instantaneous phase. A linear phase is estimated from the estimated instantaneous phase, and the estimated linear phase is removed from the estimated instantaneous phase to obtain a fluctuation term of the instantaneous phase. A delay fault is detected by comparing a time duration during which the PLL circuit stays in a state of oscillating a certain frequency with the time duration during which a fault-free PLL circuit stays in a state of oscillating a certain frequency.

Abstract translation: 提供了一种用于检测锁相环电路中的延迟故障的方法和装置。 对被测定的PLL电路施加频率脉冲作为参考时钟，将从被测PLL PLL输出的信号的波形变换为分析信号，估计其瞬时相位。 从估计的瞬时相位估计线性相位，并且从估计的瞬时相位去除估计的线性相位以获得瞬时相位的波动项。 通过比较PLL电路停留在某个频率的振荡状态的持续时间与无故障PLL电路停留在某个频率的振荡状态的持续时间来检测延迟故障。

公开(公告)号：US07636387B2

公开(公告)日：2009-12-22

申请号：US10776926

申请日：2004-02-11

Applicant: Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma ,  Hirobumi Musha

Inventor： Takahiro Yamaguchi ,  Masahiro Ishida ,  Mani Soma ,  Hirobumi Musha

IPC: H04B3/46

CPC classification number: G01R31/3171 ,  G01R29/26 ,  G01R31/31709 ,  G01R31/31725 ,  G01R31/31922 ,  G01R31/31937 ,  H04L1/205

Abstract: A measuring apparatus including a timing jitter estimator which estimates an output timing jitter sequence which indicates the output timing jitter of an output signal based on an output signal output from a DUT in response to an input signal input to the DUT, and a jitter transfer function estimator which estimates a jitter transfer function in the DUT based on the output timing jitter sequence. The jitter transfer function estimator includes an instantaneous phase noise estimator which estimates an instant phase noise of the output signal based on an output signal, and a resampler which generates the output timing jitter sequence by resampling the instantaneous phase noise at predetermined timing.

Abstract translation: 一种测量装置，包括定时抖动估计器，其响应于输入到DUT的输入信号，估计基于从DUT输出的输出信号来输出输出信号的输出定时抖动的输出定时抖动序列，以及抖动传递函数 估计器，其基于输出定时抖动序列来估计DUT中的抖动传递函数。 抖动传递函数估计器包括：基于输出信号估计输出信号的瞬时相位噪声的瞬时相位噪声估计器;以及通过在预定定时重采样瞬时相位噪声来产生输出定时抖动序列的重采样器。