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公开(公告)号：US06687629B1
公开(公告)日：2004-02-03
申请号：US09408280
申请日：1999-09-29
IPC分类号： G01R2926
CPC分类号： G01R29/26
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US06795496B1
公开(公告)日：2004-09-21
申请号：US09647908
申请日：2000-10-05
IPC分类号： H04B346
CPC分类号： G01R29/26
摘要： A signal under measurement 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 phase noise waveform. The phase noise waveform is sampled in the proximity of a zero crossing point of a real part of the analytic signal. A differential waveform of the sample phase noise waveform is calculated to obtain a differential phase noise waveform. An RMS jitter is obtained from the phase noise waveform, and a peak-to-peak jitter is obtained from the phase noise waveform.
摘要翻译： 使用希尔伯特变换器将测量信号转换为复杂的分析信号，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相位噪声波形。 相位噪声波形在分析信号的实部的零交叉点附近被采样。 计算采样相位噪声波形的差分波形以获得差分相位噪声波形。 从相位噪声波形获得RMS抖动，从相位噪声波形获得峰 - 峰抖动。
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公开(公告)号：US06775321B1
公开(公告)日：2004-08-10
申请号：US09703469
申请日：2000-10-31
IPC分类号： H04B1700
CPC分类号： G01R29/26
摘要： A signal under measurement is transformed into a complex analytic signal using Hilbert transformation to estimate an instantaneous phase of the signal under measurement from the complex analytic signal. A least mean square line of the instantaneous phase is calculated to obtain a linear instantaneous phase of the signal under measurement, and a zero-crossing timing of the signal under measurement is estimated using an interpolation method. Then a difference between the instantaneous phase and the linear instantaneous phase at the zero-crossing timing is calculated to estimate a timing jitter sequence. A jitter of the signal under measurement is obtained from the jitter sequence.
摘要翻译： 使用希尔伯特变换将测量信号转换成复数分析信号，以从复数分析信号估计测量信号的瞬时相位。 计算瞬时相位的最小均方根以获得测量信号的线性瞬时相位，并且使用内插方法估计测量信号的过零定时。 然后计算在过零时刻的瞬时相位和线性瞬时相位之间的差以估计定时抖动序列。 从抖动序列获得测量信号的抖动。
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公开(公告)号：US06525523B1
公开(公告)日：2003-02-25
申请号：US09722167
申请日：2000-11-24
IPC分类号： G01R2500
摘要： A signal under measurement is transformed into a complex analytic signal using Hilbert transformation to estimate an instantaneous phase of the signal under measurement from the complex analytic signal. A zero-crossing timing sequence of the signal under measurement is estimated using the instantaneous phase. An instantaneous period sequence of the signal under measurement is estimated from the zero-crossing timing sequence to obtain a jitter of the signal under measurement from the instantaneous period sequence.
摘要翻译： 使用希尔伯特变换将测量信号转换成复数分析信号，以从复数分析信号估计测量信号的瞬时相位。 使用瞬时相位来估计测量信号的过零定时序列。 从过零定时序列估计测量信号的瞬时周期序列，以从瞬时周期序列获得测量信号的抖动。
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公开(公告)号：US07496137B2
公开(公告)日：2009-02-24
申请号：US11137786
申请日：2005-05-25
IPC分类号： H04B3/46
CPC分类号： G01R31/31709
摘要： 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.
摘要翻译： 提供了一种用于测量测量信号中的抖动的抖动测量装置，包括：脉冲发生部分，具有用于检测数据信号低于测量值的边缘的第一脉冲发生装置，以输出具有脉冲宽度的第一脉冲信号 对于边缘进行预先设定的第二脉冲发生装置，用于检测在数据信号不足测量中数据值不变化的数据部分的边界，以输出预先设定在边缘定时上的脉冲宽度的第二脉冲信号 检测数据部分的边界和抖动计算部分，用于基于第一和第二脉冲信号计算测量数据信号中的定时抖动。
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公开(公告)号：US07203229B1
公开(公告)日：2007-04-10
申请号：US09882290
申请日：2001-06-14
申请人： Masahiro Ishida , Takahiro Yamaguchi , Mani Soma
发明人： Masahiro Ishida , Takahiro Yamaguchi , Mani Soma
CPC分类号： G01R31/31709 , G01R29/26
摘要： A signal under measurement is band-limited, and frequency components around a fundamental frequency of the signal under measurement are extracted. Waveform data (approximated zero-crossing data) close to zero-crossing timings of the band-limited signal are sampled, and phase error data between the approximated zero-crossing points and the corresponding zero-crossing points of the signal under measurement are calculated from the approximated zero-crossing data to obtain a zero-crossing phase error data sequence δ[k]. Then an instantaneous period sequence T(k) of the signal under measurement is obtained from the zero-crossing phase error data and sampling intervals Tk,k+1 of the approximated zero-crossing data sequence. Then a period jitter sequence is obtained from differences between the T(k) and a fundamental period T0 of the signal under measurement, and then the period jitter sequence is multiplied by T0/Tk,k+1 to correct the period jitter sequence.
摘要翻译： 被测信号被限制频带，提取测量信号的基频周围的频率分量。 对接近频带限制信号的零交叉定时的波形数据（近似过零数据）进行采样，并计算近似过零点与测量信号的相应过零点之间的相位误差数据， 近似的过零数据以获得过零相位误差数据序列delta [k]。 然后，根据近似的过零数据序列的过零相位误差数据和采样间隔T k，k + 1，获得测量信号的瞬时周期序列T（k）。 然后，从测量信号的T（k）和基波周期T 0 <0>之间的差值获得周期抖动序列，然后将周期抖动序列乘以T 0 SUB / T k，k + 1 以校正周期抖动序列。
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公开(公告)号：US20060087346A1
公开(公告)日：2006-04-27
申请号：US10971716
申请日：2004-10-22
IPC分类号： H03D13/00
CPC分类号： H03D13/004 , H03L7/0891
摘要： There is provided a phase difference detecting apparatus operable to detect the phase difference between a first input signal and a second input signal. The phase detecting apparatus includes: a first divider operable to generate a first divided signal, which is the first input signal divided by two, so that all rising edges of the first input signal correspond to a rising edge and a falling edge of the first divided signal; a second divider operable to generate a second divided signal, which is the second input signal divided by two, so that the first divided signal corresponds to edges; a first phase detector operable to detect a phase difference between a rising edge of the first divided signal and an edge corresponding to the rising edge in the second divided signal; and a second phase detector operable to detect a phase difference between a falling edge of the first divided signal and an edge corresponding to the falling edge in the second divided signal.
摘要翻译： 提供了一种相位差检测装置，用于检测第一输入信号和第二输入信号之间的相位差。 相位检测装置包括：第一分频器，用于产生第一分频信号，第一分频信号是第二输入信号除以2，使得第一输入信号的所有上升沿对应于第一分频信号的上升沿和下降沿 信号; 第二分频器，用于产生第二分频信号，其是第二输入信号除以2，使得第一分频信号对应于边缘; 第一相位检测器，用于检测第一分频信号的上升沿和对应于第二分频信号中的上升沿的边沿之间的相位差; 以及第二相位检测器，其可操作以检测第一分频信号的下降沿和对应于第二分频信号中的下降沿的边沿之间的相位差。
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公开(公告)号：US06598004B1
公开(公告)日：2003-07-22
申请号：US09650000
申请日：2000-08-28
申请人： Masahiro Ishida , Takahiro Yamaguchi , Mani Soma
发明人： Masahiro Ishida , Takahiro Yamaguchi , Mani Soma
IPC分类号： G06F1900
CPC分类号： G01R31/31709 , G01R29/26 , G01R31/31903
摘要： A signal under measurement is converted into a digital signal by an AD converter, and a band-pass filtering process is applied to the digital signal to take out only components around a fundamental frequency of the signal under measurement. A data around a zero-crossing of the components around the fundamental frequency is interpolated to estimate a timing close to a zero-crossing point. A difference between adjacent timings in the estimated zero-crossing timing sequence is calculated to obtain an instantaneous period data sequence. A period jitter is obtained from the instantaneous period data sequence.
摘要翻译： 通过AD转换器将测量信号转换为数字信号，对数字信号施加带通滤波处理，仅取出测量信号的基频附近的分量。 围绕基本频率的分量的零交叉周围的数据被内插以估计接近零交叉点的时序。 计算估计过零定时序列中的相邻定时之间的差异以获得瞬时周期数据序列。 从瞬时周期数据序列获得周期抖动。
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公开(公告)号：US07460592B2
公开(公告)日：2008-12-02
申请号：US11122262
申请日：2005-05-04
申请人： Takahiro Yamaguchi , Mani Soma , Masahiro Ishida
发明人： Takahiro Yamaguchi , Mani Soma , Masahiro Ishida
CPC分类号： G01R31/31709
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US07356109B2
公开(公告)日：2008-04-08
申请号：US11585526
申请日：2006-10-23
申请人： Takahiro Yamaguchi , Masahiro Ishida , Mani Soma
发明人： Takahiro Yamaguchi , Masahiro Ishida , Mani Soma
IPC分类号： H04L7/00
CPC分类号： G01R31/31709 , G01R31/31725 , G01R31/31922 , G01R31/31937 , H04L1/205
摘要： 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).
摘要翻译： （t）和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。
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