公开(公告)号：US07424382B2

公开(公告)日：2008-09-09

申请号：US10996579

申请日：2004-11-23

申请人： Gunter Steinbach ,  Brian J. Galloway ,  Ken A. Nishimura

发明人： Gunter Steinbach ,  Brian J. Galloway ,  Ken A. Nishimura

IPC分类号： H04B17/00

CPC分类号： G01R31/31709 ,  G01R31/3171 ,  H04L1/20

摘要： Systems and methods of characterizing eye diagrams are described. In one aspect, at measurement times across a measurement interval spanning at least one unit interval of the input signal, corresponding levels of the input signal are classified into groups based on at least one threshold. An eye diagram characteristic width is derived based on a distribution across the measurement interval of the levels in one of the groups.

摘要翻译： 描述了表征眼图的系统和方法。 在一个方面，在穿过输入信号的至少一个单位间隔的测量间隔的测量时间，输入信号的相应电平基于至少一个阈值被分类成​​组。 基于在其中一个组中的级别的测量间隔上的分布导出眼图特征宽度。

公开(公告)号：US06937069B2

公开(公告)日：2005-08-30

申请号：US10601993

申请日：2003-06-23

申请人： Brian J. Galloway ,  Thomas A. Knotts

发明人： Brian J. Galloway ,  Thomas A. Knotts

IPC分类号： H03D13/00 ,  G01R23/02

CPC分类号： H03D13/003

摘要： In one embodiment a system and method is arranged for bridging the dead-band when asynchronous signals are compared against each other. There is developed a pair of phase related signals from one of the signals, each phase related signal phase shifted from each other, but having the same frequency as the signal from which it was derived. The other frequency signal is compared against each of the phase-related developed signals to generate an error signal which quadrature rotates when the first and second signals are out of frequency with each other. A control signal is generated when the quadrature rotation is outside a certain limit. The error signal is controllably buffered to insure that the error signal only occurs when the frequencies are offset for a selected period of time.

摘要翻译： 在一个实施例中，系统和方法被布置为当异步信号彼此比较时桥接死区。 从一个信号中产生一对相位相关信号，每个相位相关信号相位彼此偏移，但是具有与从其导出的信号相同的频率。 将另一个频率信号与每个相位相关的显影信号进行比较，以产生当第一和第二信号彼此超出频率时正交旋转的误差信号。 当正交旋转超出一定限度时，产生控制信号。 误差信号被可控地缓冲以确保仅在频率偏移选定的时间段时才发生误差信号。